Homestead Wakefield Elementary School HVAC Upgrade
Location: Bel Air, Maryland
Completion Date: Fall of 2025
Sales Rep: Hydro Tec Sales and Service
Griswold Controls Products Used: Coil Piping Package including QuickSet Manual Balance Valve
Description:
The community of Bel Air, Maryland has been planning this exciting project for over 30 years: Homestead Wakefield Elementary School. Since 1958, this school has served it’s community by helping students reach their full potential. Now, the town of Bel Air and the school agree: an update is long deserved.
Challenges and Solutions:
One of the primary challenges was retrofitting the school buildings with a modern HVAC solution that could meet the school’s needs without disrupting the educational process. Hydro Tec Sales and Service, leveraging their extensive HVAC expertise, recommended Griswold Controls Coil Piping Packages and QuickSet Manual Balance Valves for their proven performance in educational settings.
Modular design was selected to meet the school’s needs and site conditions while providing flexibility and scalability. The new modular design, which includes a modular complex with classrooms, a cafeteria, and a multipurpose room. The design of these modular classrooms aims to replicate the environment of permanent structures, ensuring that temporary facilities maintain the same high-quality standards.
The Coil Piping Packages from Griswold Controls were chosen for their ability to reduce labor costs and minimize potential leak points. These pre-assembled systems are ideal for a school setting, where streamlined product distribution and simplified purchase order processes are paramount. For more information on applications in schools and universities, please refer to Griswold Controls’ application tips. These Coil Piping Packages were outfitted with QuickSet Manual Balance Valves. These were selected for their user-friendliness and precise flow control, crucial for maintaining a balanced and efficient HVAC system.
Benefits and Outcomes:
The integration of Griswold Controls’ products led to a streamlined installation process, significantly reducing both the time and cost associated with the upgrade. The QuickSet Manual Balance Valves provided precise flow control, essential for the optimal functioning of the HVAC system, while the Coil Piping Packages ensured a hassle-free installation with minimal risk of leaks. These benefits are perfect for the modular design and an educational application.
The upgraded HVAC system will also enhance indoor air quality, creating a healthier environment for students and staff, which can lead to better concentration and overall improved academic performance.
Products Used:
The Homestead Wakefield Elementary School project incorporated Griswold Controls Coil Piping Packages, designed to simplify the installation process and ensure system integrity. See why education institutions trust our products.
These packages include all necessary components for a complete coil connection, simplifying on-site assembly which was an important factor in this project. Additionally, the QuickSet Manual Balance Valves were chosen because they are specifically known for their precision and reliability, which include brass venturi inserts for flow measurement and graduated memory stops for flow setting.
Photos from Banta Campbell
About Hydro Tec Sales and Service
Hydro Tec Sales and Service is a leading provider of sustainable and efficient HVAC solutions. The company has a 25-year heritage in its local markets and over 60 years of combined sales experience. With offices in Central Virginia, Metro Washington, D.C. and Baltimore, MD, Hydro Tec covers the marketing territories of Virginia, Maryland, and D.C. Specializing in flow measurement and control, Hydro Tec offers multiple product lines from manual balancing valves and flow meters, to automatic flow and temperature control hook ups as a prefabricated package.

Have a question about this or another Featured Project? Fill out the form below and someone from Griswold Controls will get back to you shortly.

RUTGERS UNIVERSITY: RWJUH CENTER FOR INNOVATION

PRINCETON UNIVERSITY CBE BUILDING
ANAZAO HEALTH
JOAQUIN MURRIETA PARK

Wesleyan University Science Building

Yale New Haven Hospital Adams Neuroscience Center

Zoetis Vivarium

Homestead Wakefield Elementary School HVAC Upgrade

Spelman College

UT Southwestern Medical Center

400 Central Residency

Netflix Sound Stages

First Solar

Arizona Western College – DeAnza Residence Hall

University of Michigan – Leinweber Building

Celina Elementary School

LAX Automated People Mover

Lake Land College – Neal Hall

Peppermill Resort Tower

West Henderson Hospital Tower

Aurum Golden Apartments

Hostess Brands

Covenant Health West Tower

L&I/WSDA Safety and Health Lab

North Seattle College Library Renovation

Lowell Elementary School

Aquarium of the Pacific – Otter Surrogacy
Video Credit: YouTube

GM Lordstown Electric Battery Plant

Winthrop Center

eBay Utah Data Center – Pressure Independent MVP Valves

Educational Learning Center

Olympic Regional Development

Bentall Skyrise

City of Hope Cancer Center – Irvine

Facebook Data Center – New Mexico

Wester Middle School

First National Bank Tower

Arizona State University- Interdisciplinary Science and Technology Building VII

320 York Street- Yale’s Hall of Graduate Studies

North City Campus Modernization

MFSH NICU – Postpartum

The DMAFB General Instruction Building

Monteleone Hotel Update, New Orleans
Hotel Monteleone – New Orleans
Griswold Controls helps preserve a historic French Quarter landmark through a phased HVAC retrofit using Automizer® coil piping packages.
Project Overview
The Challenge
Located in the heart of the French Quarter, the 15-story Beaux-Arts landmark Hotel Monteleone required a major HVAC retrofit while remaining fully operational. The property includes over 600 guest rooms and had to maintain comfort, aesthetics, and revenue during renovation.
- Minimal Guest Disruption Rooms could only be taken offline in small groups. The hotel had to remain fully operational during renovation.
- Historic Preservation Tight mechanical spaces required a compact, small-footprint solution.
- System Compatibility The four-pipe fan coil configuration required a unified, single-source solution.
- Phased Execution The retrofit needed to be efficient across multiple renovation phases.
The Solution
Working closely with Wink Engineering and the hotel’s facilities team, Griswold Controls recommended installing Automizer® combination control valve coil piping packages on the four-pipe fan coils.
Key Advantages
- Single Source for Coil Components Eliminates coordination issues and ensures system compatibility.
- Multi-Function Valve Combines actuated temperature control and flow limiting in one compact package.
- Small Footprint Ideal for historic buildings with tight mechanical space.
- Equal Percent Control Mirrors coil heat transfer curves for superior temperature regulation.
- Pre-Assembled & Ready to Install Reduces labor, installation time, and jobsite handling.
I told Gary to get the Griswold Control valves on order and let my purchasing department know how much the bill would be.
— A.J. Mattern, Chief Facilities Engineer, Hotel MonteleoneBecause the Automizer features automatic flow control, the retrofit could be accomplished a few rooms at a time without affecting the rest of the hotel's circuits — making it the ideal product for hotel renovation. In a manual balance application, the entire system would have had to be rebalanced every time a room was taken offline. By installing the Automizer, the hotel minimized room downtime, substantially reducing the potential for lost revenue.
The Results
Phase 1 (2002): The Monteleone Hotel renovated guest rooms with 288 Automizer CPP2A packages on horizontal units, plus a number of 3-way Unimizer® actuated control valves on vertical units.
Phase 2 (2004): The hotel ordered an additional 112 Automizer coil piping packages. The re-order decision was automatic — a direct result of satisfaction with Phase 1 performance.
Because the Automizer features automatic flow control, rooms could be renovated individually without requiring a system-wide rebalance — protecting guest comfort and preventing revenue loss.
The success at the Monteleone Hotel demonstrates how a technically superior product can simplify phased renovation in occupied, operating buildings — protecting revenue while delivering measurable long-term performance gains.
It's nice when you are selling a quality product like Griswold Controls. You put your time and effort into getting that first order, and then getting the next order just takes a few minutes on the phone.
— Gary Lewis, Schully Strawn & AssociatesThey work great! I'm very satisfied and look forward to buying Griswold Controls for every new FCU in the hotel as we continue to renovate additional rooms.
— A.J. Mattern, Chief Facilities Engineer, Hotel MonteleoneAutomizer® Combination Control Valves
Automizer® Next Generation valves combine an actuated 2-way control valve with a stainless steel automatic flow limiting cartridge and manual isolation ball valve — all within one compact body.
- Globe Valve Performance Ball valve pricing with equal-percent control.
- Patented Optimizer® Inserts 30–50% greater rotation response.
- Automatic Flow Limiting Eliminates overflow and underflow.
- Field Repairable Stem Resistant to chemical treatments and temperature swings.
Coil Piping Packages & Hose Kits
Griswold Controls offers over 900 standard pre-plumbed coil piping packages that simplify engineering design and speed installation.
- Pre-Assembled & Shrink-Wrapped Ships ready to install.
- 48-Hour Shipping Standard packages up to 2″.
- Automatic or Manual Flow Options Works for any balancing application.
- Single Source Supply Eliminates compatibility concerns.
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

University of California, Irvine
A Higher Tech Education for UC Irvine
Ease of installation and continued product support make the difference at UC Irvine
Project Overview
The Challenge
In early 2003, GEM Engineering and UC Irvine sought complete coil hookup solutions for the Natural Science Unit II building. Despite competitive pricing from J.D. Sales Company, a competitor initially won the bid with a significantly lower price point.
However, upon technical review, UC Irvine's engineering team rejected the competitor's product, recognizing the importance of performance and reliability over initial cost savings.
The Solution
J.D. Sales Company partnered with Griswold Controls to present an innovative alternative to the traditional approach of using separate components (actuated globe valves, strainers, unions, and isolation ball valves).
The engineering team was introduced to Griswold's Automizer™ Combination Control Valves and CPP-2A coil piping packages, a streamlined solution that consolidates multiple components into just two valves.
Key Advantages
- Superior Flow Performance The Optimizer™ Parabolic Flow Insert delivers globe valve performance at ball valve economics
- Simplified Installation Complete coil hookup in two valves versus multiple separate components
- Integrated Design Combines actuation, isolation, and flow control in a single package
- Long-term Value Reduced installation time and maintenance requirements
Field Experience
Site Foreman for A.O. Reed and Company, Kevin Campbell, was worried about installation because he wanted to use his skilled labor most efficiently. Griswold CPP-2A came to the rescue.
Normally, one man can install 3.5 or maybe 4 coil hookups in one day. "With the Automizer packages," said Kevin, "Our guy was able to install 9 packages per day."
Automizer™ Combination Control Valve packages not only gave the contractor the entire coil hookup in just two valves, they cut labor at installation. That's because they require only four connections instead of over ten with individual products.
Remember, low-cost competitors can make sales difficult, but when you take the time to give your customer a higher technology education about Griswold products, they'll pay back your efforts with orders.
The Results
UC Irvine's engineering team recognized the technical superiority and operational advantages of the Griswold solution.
The project ultimately specified over 200 CPP-2A coil piping packages, demonstrating the value of investing in proven, high-performance technology.
This success showcases how taking the time to educate customers about superior technology solutions—rather than competing solely on price—results in better outcomes for all stakeholders.
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

Las Vegas’ Wynn Hotel & Casino
Wynn Las Vegas Resort – Las Vegas
Utilization of Griswold Controls coil piping packages to save a significant amount of install time for the new Wynn Las Vegas Resort.
Project Overview
The most recent – and stunning – addition to the southern Nevada skyline is the new Wynn Las Vegas Resort. Built at a cost of $2.7 billion dollars and opened in April 2005, the 50-story bronze tower contains 2,700 luxury hotel rooms with floor-to-ceiling windows, 22 restaurants, the 2,000 seat “Aqua Theater-in-the-Round,” and the “Promenade” with luxury boutique shopping. Built on the site of the former Desert Inn, it also includes an 18-hole golf course. Whereas most high-end hotels have car rental desks, Wynn Las Vegas houses a Ferrari-Maserati car dealership inside the resort. The front entrance and three-acre Lake of Dreams are shielded from the street by a 140-foot tall mountain with 60-foot tall pine trees.
Steve Wynn, who had previously built the Mirage (1989), Treasure Island (1993) and Bellagio (1998) hotels, conceived and developed Wynn Las Vegas. Several years ago he sold those three properties to MGM Grand in order to develop Wynn Las Vegas. This resort-casino clearly establishes a new threshold for local, high-end properties. JBA Consulting Engineers, Las Vegas, is the mechanical engineering firm responsible for the project. Bid and mechanical construction activity was divided into seven distinct areas, and the specification allowed for either automatic or manual flow controls. Southland Industries, Las Vegas, handled area one and the central plant, and Hansen Mechanical of Las Vegas was awarded responsibility for areas two through seven, which covered the tower.
Engineered Equipment & Systems Co., the Griswold rep for southern Nevada, successfully convinced Southland Industries and Hansen Mechanical to utilize Griswold coil piping packages. Unimizers® were installed on a majority of the fan coils, VAV boxes, heating coils and heat pumps in the hotel rooms, showrooms, the Aqua Theater and the villas.
According to Matt Miceli, the Engineered Equipment & Systems Co. sales engineer responsible for the project, the Unimizer packages significantly reduced Hansen’s ATC coordination costs. Matt said, “Hansen has been a Griswold Controls customer for some time. They especially like Griswold’s coil hookup packages and the way we shrink-wrap them. No other vendor provides this packaging concept. This project also offered them the opportunity to add the Unimizer® to the packages, which greatly simplified the coordination with the ATC contractor. The project time frame was extremely aggressive and the Unimizer® packages saved the contractor a significant amount of install time.” James Gomel, Hansen Mechanical project manager, stated, “The Griswold coil-piping packages allow for installation consistency to the systems along with a valuable savings in labor cost. In addition, incorporating the Unimizer® with the package allows for a complete installation of the coil-piping package, thus eliminating the need for additional labor required to install the controller in the field."
In total, over 2,000 Griswold Controls piping packages are installed on the project along with over 20 air handler packages in area one. In addition to the flow controls and coil piping packages, Engineered Equipment & Systems Co. sold in excess of $100,000 worth of Griswold Filtration separators and separator package filtration systems for the numerous cooling towers on the project.
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

W Hotel & Victory Park, Dallas
W Hotel & Victory Park – Dallas
Griswold Controls helps to re-shape the downtown Dallas skyline, providing space saver packages to maximize floor space in the hotel.
Project Overview
Located in the heart of Dallas, just north of the downtown business district in a formerly unusable inner city site, Victory Park is one of the country’s most significant master planned urban developments. The project began with the construction of the American Airlines Center Arena in late 2000, home of the Dallas Mavericks basketball team and the Dallas Stars hockey team. A acre urban center, when complete Victory Park will offer retail establishments, dining, modern office space, residential units, entertainment venues, and a cutting-edge hotel. Part of the development will include Victory Plaza, an area reminiscent of Times Square in New York City.
In 2005, immediately across the street from the American Airlines Center, McCarthy General Contractors broke ground on what is now the W Hotel. The W Hotel, owned by Starwood Properties, is a 33 story luxury condo–hotel offering unique and exciting interiors, classic W amenities including terry/pique robes, an infinity edge swimming pool on the 16th floor, and top–notch restaurants and lounges. W Benton Wofford of James Johnston & Associates, the Consulting Engineer, designed the building to include hotel facilities up to the 15th floor, and luxury condo units from the 16th to 30th floors. Ross Perot Jr. has his own private penthouse suite complete with his own personal heliport on the roof.
Griswold Controls IRIS automatic packages with hoses were purchased for the terminal units; vertical stack heat pumps in the hotel rooms; and to maximize floor space, horizontal heat pumps for the condo units. Griswold Controls space saver packages were selected on the vertical stack units because space limitations required that the packages fit inside the heat pump cabinets.
Matt Summerville of Brandt Engineering, project manager for the mechanical contractor and long-time Griswold Controls customer, was pleased to provide Griswold Controls with project details. As a matter of fact, Brandt employee Mike Clark, the piping superintendent, told Griswold Controls that he had no problems whatsoever with any of the 382 Griswold Controls packages on the W Hotel and would not only use Griswold Controls products again, but would highly recommend them.
The W Hotel opened in June, 2006.
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

Southern Indiana Career and Technical Center
Southern Indiana Career and Technical Center
Griswold Controls works with Indiana high school to operate the HVAC system as efficiently as possible using MVP™ Valves.
Project Overview
A State‑of‑the‑Art Center Built on a Budget
Opening on September 13, 2006, the $32.5 million, 262,000 square foot center is progressive in design, and equipped with state–of–the–art equipment. A major responsibility for the architects and engineers was to integrate concerns about cost–effectiveness and tight school budgets into their design. This applied to all aspects of the center, including the criteria to operate the HVAC system as efficiently as possible given the budget constraints.
Veazey, Parrott, Durkin, & Shoulders were the architects, with mechanical engineer Tom Durkin, P.E. having responsibility for the mechanical systems. Kevin Smith of Hydronic Sales did the valve selection and coordination, ultimately specifying (42) Griswold Controls MVP™ valves and (125) CPP–IRIS packages on the project. There are (21) Trane air handlers regulating the center, and the pumps are controlled by a VFD system.
“We all had a responsibility to the taxpayers to design something functional but frugal at the same time. The planning task force clearly stated that they did not want to build the Taj Mahal with taxpayers’ money.”
— Kevin Smith, Hydronic SalesWhy MVP™ Valves Were the Right Choice
The MVP™ valve was selected because of its ability to work seamlessly within the VFD-controlled pump system while delivering measurable energy and cost benefits across the facility.
- Tracks with the VFD system Only a change in demand load will cause a flow rate change — not the pressure drop across the valve.
- Reduces air side fan energy Flow, coil output, and controlled temperature remain stable, directly reducing fan energy consumption.
- Independent circuits Circuits with MVP™ valves are independent, allowing the use of CPP–IRIS on small demand loads and keeping initial costs down.
- Factory-set maximum flow rates Maximum flow rate for cooling and heating coils can be set at the factory using dip switches, saving time and manpower in the field.
Through a collaborative effort among the architects, mechanical engineers, and Griswold Controls, Southern Indiana now has a state–of–the–art technical center that accommodates a wide variety of uses — all while respecting the taxpayers’ investment.
Questions about this application? Contact info@GriswoldControls.com or 949.559.6000
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

Los Angeles Music Center’s Disney Concert Hall
Los Angeles Music Center’s Disney Concert Hall
By providing piping packages to help offset installation costs and to take advantage of their space–saving features, Griswold Controls provided a cost-effective solution for the hot and chilled water fan coils and air handlers.
Project Overview
An Iconic Venue for an Iconic Solution
The Concert Hall was designed by Frank Gehry, an internationally recognized architect whose many credits include the Guggenheim Museum in Bilbao, Spain and the American Center in Paris. The ceiling of the building features wavy, steel forms which are designed to appear like a ship with billowing sails at full mast.
Groundbreaking commenced on the project in late 1999, and the Concert Hall was finally dedicated in 2003 at an ultimate cost of $274 million. This ‘monument to music’ became the key to the resurgence of downtown Los Angeles and a beacon for the extensive commercial and condominium housing development which has followed.
The Griswold Controls Solution
Griswold Controls’ Los Angeles rep, Mahendra Mistry, owner of JD Sales Co., worked with the project’s mechanical engineering firm, Levine/Seegel Assoc. of Santa Monica, CA, to obtain favorable specifications for Griswold Controls automatic FCVs, calling out individual FCVs for various terminal units per the piping arrangement shown on the drawings.
ACCO Engineered Systems of Glendale, CA, the principal mechanical contractor, was intent on using piping packages to help offset installation costs as well as take advantage of their space–saving features without compromising the piping arrangement shown on the drawings. Mahendra worked closely with Frank Falcone, Bill Traub and Mike Masterman of ACCO to sell nearly 200 Isolator™ Y coil piping packages for installation on the VAV boxes and another 60+ automatic flow controls on the hot and chilled water fan coils and air handlers.
- ~200 Isolator™ Y Coil Piping Packages Installed on VAV boxes throughout the facility.
- 60+ Automatic Flow Controls Installed on hot and chilled water fan coils and air handlers.
- Quickset® Manual Balance Valves Installed on pump discharge risers in low-headspace basement conditions.
Overcoming a Unique Installation Challenge
Another challenge presented itself regarding the flow measuring devices specified on the pumps. The pumps were installed in the basement with limited headspace below the ceiling. None of the specified devices could be accommodated because of their requirement for normal upstream and downstream pipe diameters on the vertical discharge risers.
Although not specified for these manual devices, Mahendra worked closely with ACCO through 4 submittals to gain approval of Griswold Controls’ Quickset® manual balance valves, utilizing their disturbed flow technology as the only alternative that would fit in the low headspace and still provide the specified accuracy.
Griswold Controls and JD Sales are very proud of their involvement in this world–class project.
Questions about this application? Contact info@GriswoldControls.com or 949.559.6000
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

University of California Merced
UC Merced – Irrigation Project
Griswold Controls helps UC Merced meet its "green" campus mission through the use of the 2000 series valves to operate the irrigation systems.
Project Overview
UC Merced, the 10th campus in the prestigious University of California system and the first major American research university to be built in the 21st century, opened September 5, 2005. Only 2 major buildings are finished at this time, with an estimated completion project timeline of five to seven years. The long-range plans call for a 2,000-acre campus surrounded by an 8,300-acre community. Building design and construction emphasized the use of the most cutting-edge "green" building practices, reflecting the university's commitment to environmental conservation and stewardship.
UC Merced is the first new UC campus in 40 years. It was authorized by the California Legislature in 1988 to address the higher-education needs of the state's fastest-growing region, the San Joaquin Valley (population 3.5 million), and provide added capacity for the UC system at about half the rate of students from other parts of the state. UC Merced increases educational access and opportunities for valley students and contributes to the economic growth of Central California.
The San Joaquin Valley, where UC Merced is located, is extremely hot and dry during the summer and cool and damp in the winter. Summer temperatures are consistently in the mid to upper 90's in the area, with some locations topping out at 115°.
The university's irrigation plan had to incorporate the extreme summer temperatures along with principles for green landscaping. The consultants on the project, I.S.C. of Livermore, California, chose Griswold Controls 2000 series valves to operate the irrigation systems, noting that they were the most reliable valves for that environment and the scope of the project. Several hundred 2000 series valves have been installed so far, with several thousand to be used over the life of the project.
2000 series valves are self-cleaning, requiring no filters or screen to replace; self-closing, minimizing stress to the pipes, joints, and sprinkler heads; and constructed of brass and heavy-duty cast iron. No other valve is as versatile or has the potential to save thousands of dollars in potential pipe repairs and maintenance costs.
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

David Braley Athletic Centre, McMaster University
McMaster University — Hamilton, Ontario
David Braley Athletic Centre
Replacing conventional control and balancing valves with Griswold Controls pressure independent control valves to reduce energy consumption and deliver exceptional system performance.
Project Overview
The Challenge
The David Braley Athletic Centre, located on the campus of McMaster University in Hamilton, Ontario, is one of the largest fitness centres at any Canadian university. The athletic complex includes a double gymnasium, indoor 200-meter track, four squash courts, multipurpose studios for karate, yoga, dance and tai chi, and one of the only in-ground hydrotherapy pools in the country.
The building was originally specified with conventional control and balancing valves. Kildonan Energy Products, the local Griswold Controls sales representative, working with University personnel and the construction/design team, identified an opportunity to significantly improve system performance and energy efficiency by switching the air handler chilled water valves to Griswold Controls pressure independent control valves.
With 11 valves serving a peak chilled water flow of approximately 300 gpm, and coils selected for a design ΔT of 10° C (18° F), the system needed to deliver reliable, efficient performance across a wide variety of occupancy and weather conditions.
The Solution
The design team replaced the originally specified conventional valves with (10) Griswold Controls PIC‑V® and (1) MVP™ pressure independent control valves. The building connects to the central plant’s chilled water supply and return lines, and contains variable speed chilled water booster pumps that only run if the mains’ differential cannot satisfy the building.
- Self-balancing operation Valves respond only to load changes, not system pressure fluctuations — eliminating the need for separate balancing valves.
- High ΔT performance Coils deliver their full design heat transfer potential, maximising chiller plant efficiency.
- Booster pump savings With consistently low chilled water flow requirements, the booster pumps rarely, if ever, need to run.
- Simplified design One valve replaces the conventional control valve and balancing valve pair at each coil.
The Results
Performance of the pressure independent control valves has been excellent. ΔT across the athletic centre has been as high as 17° C (31° F) — nearly double the design ΔT — with all systems meeting set point.
“One cool morning in September of ’07, the building was running with 24 gpm of chilled water — less than 10% of the design flow. With the exceptional control provided by the Griswold Controls valves, chilled water flow requirements are very low and the booster pumps rarely, if ever, need to run.”
— Facility Services, McMaster UniversityMcMaster University’s facility services personnel, under the supervision of Chief Operating Engineer Joe Emberson, are diligently dedicated to achieving ideal comfort performance combined with reduced energy consumption from the campus chilled water system. Griswold Controls’ pressure independent valves are proving to be an invaluable resource toward achieving those objectives.
Questions about this application? Contact info@GriswoldControls.com or 949.559.6000
Pressure Independent Control Valves
Griswold Controls’ MVP™ and PIC‑V® are Pressure Independent Control Valves. Pressure independent valves dramatically reduce the energy costs, capital expenses, maintenance costs, performance issues, and capacity limitations associated with typical HVAC system pressure fluctuations. They are designed to replace the conventional 2-way control valve and balancing valve pair installed at heating and cooling coils in buildings.
To obtain the most efficient and optimal results in a system, only the necessary amount — no more and no less — of chilled or heated water must be delivered to the heating and cooling coils at all times. This saves energy, increases available plant capacity, minimizes capital expenses, and simplifies system design and control.
Pressure independent valves stabilize flow. With stable flows, the designed heat transfer is maintained. The result is energy savings because less flow is required to achieve the same heat transfer.
Every year billions of dollars are wasted due to the weaknesses in HVAC heating and cooling systems. If systems do not consistently operate at their designed temperature differential, energy waste occurs and money is needlessly thrown away. This unnecessary expense can be eliminated by using Griswold Controls’ pressure independent valves.
When conventional 2-way valves are used to control the flow of water through coils, various actions — such as adjusting a valve or changing the pump speed — affect pressure in the distribution system. These actions in turn affect the flow through a two-way valve even if the load does not change. The thermostat responds and the valve modulates to bring the flow back to what is required. Until the flow is corrected, the coil operates at an off-design point and will over – or under – condition the space.
With a pressure independent valve, set point deviation will not happen. The valve responds only to a signal from a thermostat indicating the load has changed. By responding only to the change in load, the pressure independent valve is self–balancing — it delivers the proper amount of flow regardless of the state of other components in the system. The entire HVAC system is always in a state of constant flow balance.
Griswold Controls’ MVP and PIC‑V pressure independent control valves ensure that all HVAC systems achieve steady flow and high ΔT at all loads, guaranteeing stable temperature control and better heat transfer — resulting in lower energy costs and lower flow requirements.
MVP™ — Features & Benefits
MVP pressure independent control valves maintain the required flow rate regardless of pressure fluctuations.
- Pressure independent control Provides balancing at any point below and including the maximum flow rate, eliminating hot and cold spots in a building.
- Reduces energy required Increases chiller efficiency by 15–20% and increases ΔT across coils, heating and cooling more space with less equipment and energy.
- Flow stability regardless of pressure No change in flow regardless of pressure fluctuations up or downstream — requires less work for the actuator and increases actuator life.
- Multifunction modulating 2-way control Combines differential pressure control with modulating control into one compact valve housing.
- Reduces valve and actuator hunting Compensates for pressure changes in the system, increases occupant comfort, and extends both actuator and seat life.
- Low torque Reduces actuator size needed, allowing for use of a less expensive actuator.
PIC‑V® — Features & Benefits
PIC‑V & SpaceSaver PIC‑V combine a balancing valve & control valve into one, maintaining flow control regardless of pressure fluctuations.
- Pressure independent control Provides balancing at any point below and including the maximum flow rate, eliminating hot and cold spots in a building.
- Flow stability & efficiency No change in flow regardless of pressure fluctuations — heat and cool more space with less equipment & energy, increasing actuator life.
- Controls flow exactly Eliminates all overflow or underflow at coils.
- Low torque Reduces actuator size needed, allowing for a less expensive actuator.
- Universal mounting plate Offers compatibility with most manufacturers’ actuators.
- Next generation triple seals & field-repairable stems Provide resistance to chemical treatments and temperature fluctuations, and allow field servicing without removing the valve.
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

Hotel Intercontinental, Chicago, Illinois
Hotel InterContinental Case Study
Improving room comfort with Griswold Controls' Automizer® combination control valves and Coil Piping Packages
Project Overview
The Hotel Inter-Continental was built in 1929 as the Medinah Athletic Club. The contemporary North Tower was added later.
Cramped Spaces Prompt Ingenuity
During the renovation, more than 500 fan coils were replaced in North Tower guest rooms. Units were installed above the ceiling in the entry vestibule of the rooms, leaving only 12" of vertical space for the manual balancing system. Tobin Stanley of Bovis Lend Lease contacted Griswold Controls to provide pre-assembled coil piping packages with Automizer® combination control valves, saving space and labor during installation.
"This gave the client the opportunity to purchase prefab equipment and just put (it) in. This also meant that installers would spend minimal time on the site, so only two floors would have to be closed at a time."
— Bill Toth, Griswold Controls Sales RepresentativeCoil Piping Packages Provide Numerous Benefits
The balancing cartridge in the Automizer is factory preset to automatically limit the flow for each room or zone, eliminating the need for startup balancing and any subsequent rebalancing. The automatic balancing packages saved the hotel approximately $35,000 in start-up labor alone.
For this project, the standard coil package included the flow limiting cartridge of the Automizer combined with a low-torque, equal-percentage actuated ball valve and factory mounted Siemens actuators. The entire piping package takes up roughly one-fourth the space of a typical manual piping configuration.
Trouble-Free Balancing, Increased Comfort
With the renovation complete and the North Tower in full operation, Kees Guijt, regional director of engineering, reports there has been a significant drop in guest complaints regarding room comfort.
Automizer® & Coil Piping Packages
Automizer® combination control valves
Automizer® Next Generation valves feature Griswold Controls' field repairable stem design and allow for field servicing without removal. These all-in-one valves combine an actuated temperature control valve with an automatic flow limiting cartridge, making them ideal for schools, office buildings, VAV boxes, fan coil units, heat pumps, and terminal boxes.
Coil Piping Packages & Hose Kits
Griswold Controls offers over 900 standard packages, pre-assembled for easy installation and timely delivery. Options like hoses and extension kits are also available.
- Wide selection of pre-assembled, easy-to-order configurations
- Easy ordering: order by specific part numbers
- Timely delivery of standard packages
- Variety of options: downsized automatic temperature control, extra ports, inclusion of Automizer or Unimizer valves
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

CBS Studios, Manhattan, New York
CBS Studios – New York City
Ensuring TV anchors keep their cool using MVP valves and Isolator™ Rs Uni-Flanges on chilled water system.
Project Overview
The Challenge
CBS Studios faced a daunting challenge controlling cooling capacity in their Manhattan sound and TV studios. Manual balancers struggled due to multiple pumps and partial VFD control, making temperature control unreliable. Griswold Controls was contracted to provide a solution.
Kristen Ortlinghaus of Griswold Controls and MDM Consulting Engineers collaborated to select the correct valves for the project. MVP™ pressure independent valves, Isolator™ Rs, and Uni-Flanges were chosen. The installation schedule was aggressive: first shipment in four weeks, complete installation in seven weeks.
After completion, CBS was extremely satisfied, planning to use additional MVP valves and convert all manual-balanced coils to Griswold Controls products in the future.
Valve Products
Isolator™ & “K” Automatic Flow Control Valves
Isolator and “K” automatic flow control valves are available with a wide range of flows and PSID, and are ideal for tight spaces. These valves offer easily accessible flow control cartridges combined with isolation ball valves, allowing exchange of the flow control cartridge without breaking pipe connections if system flow requirements change. They also simplify maintenance of coils and temperature controls. Perfect for terminal boxes, VAV boxes, fan coil units, heat pump installations, and baseboards/in-cabinet applications.
QuickSet® Manual Balance Valves
QuickSet manual balance valves make proportional or static balancing simple and fast. Available in standard configurations or with accessory ports, QuickSet valves feature patented Optimizer® parabolic flow inserts for minimal handle movements and smooth flow changes. Full range handle position control ensures precise flow is achieved immediately. Ideal for casinos, hotels, VAV boxes, fan coil units, and heat pump installations.
Unimizer® Actuated Control Valves
Unimizer 2- and 3-way actuated control valves provide precise temperature control wherever actuated ball or globe valves are needed. They feature high close-off pressure, multiple Cvs for exact pressure drop matching, and equal percentage flow via the patented Optimizer® insert. Ideal for hotels, schools, terminal units, VAV boxes, air handling units, fan coil units, heat pump installations, equipment rooms, and pipelines.
Automizer® Combination Control Valves
Automizer all-in-one valves combine an actuated temperature control valve with a stainless steel automatic flow limiting cartridge. They integrate the entire return side of the coil in one unit: flow limiting valve, actuated 2-way control valve, and manual isolation ball valve. Patented Optimizer® ensures equal percentage flow characteristics. Ideal for schools, office buildings, VAV boxes, fan coil units, heat pump installations, and terminal boxes.
PIC-V® Pressure Independent Control Valves
PIC-V pressure independent control valves maintain accurate flow regardless of pressure fluctuations, providing stable balancing at all points up to maximum flow rate, eliminating hot and cold spots. They combine balancing and control valve functionality into one compact housing. Perfect for office buildings, prisons, hospitals, laboratories, computer centers, and high-tech manufacturing.
Questions about this application? Contact info@GriswoldControls.com or 949.559.6000
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

Griswold Controls NEXT GENERATION products

Vancouver International Airport Domestic Terminal
Vancouver International Airport Domestic Terminal
Vancouver International Airport uses Griswold Controls MVP™ valves to improve heating and cooling comfort issues and reduce energy consumption.
Project Overview
Controlling Air Travelers’ Comfort
In the fall of 2005 Vancouver Airport Authority had a number of difficult and challenging problems to overcome. First, they were facing comfort issues in various areas of the Domestic Terminal, and they were not able to consistently achieve comfort set points. In addition, Airport Authority staff were seeing low ΔT – a system originally designed for 5.6° C (10° F) was operating at 3.3 to 4.4° C (6–8° F), thereby causing very high energy consumption. Lastly, during warm weather they had to operate more chillers than were necessary in order to achieve the desired temperature.
MCW Engineering, Vancouver, B.C., the mechanical engineering consultant for the project worked closely with ESC Automation also of Vancouver, the controls contractor, and Riada Sales, the Griswold Controls sales representative, to resolve the issues. They came up with three basic objectives for a retrofit: reduce energy consumption, solve the comfort problems, and operate at a higher ΔT in order to allow the existing distribution piping to handle increased load from planned expansion.
The system in place consisted of three 400 ton water-cooled chillers (one for back-up) and one 800 ton chiller. There was a constant flow primary – secondary design with three secondary pumps, pumped coils with both 3-way control valves and manual balance valves, three booster pumps that had been added to solve flow problems, and a check valve that had been installed in decoupler pipe to prevent recirculation of return water.
The MVP™ Retrofit Solution
Griswold Controls MVP™ valves solve comfort issues and reduce energy consumption at Vancouver International Airport.
A key component of the retrofit involved installing new Griswold Controls MVP™ 2-way modulating pressure independent control valves on 25 air handling chilled water coils. In addition, Griswold Controls Unimizer® 2-way actuated control valves and wafer flow limiters were installed to form crossover bridges, operating three tertiary load zones serving 12 of the 25 air handlers. Griswold Controls flow limiters were installed on two heat exchangers serving perimeter induction units, and variable speed drives were added to the secondary and tertiary chilled water pumps.
The last part of the plan was to bypass the coil pumps, remove the check valve from the decoupler and replace it with a bi-directional flow meter, and change the plant chilled water set point from 6° C (43° F) to 4.5° C (40° F).
Alfred Veldman of ESC Automation, Vancouver, B.C., sets the flow on a Griswold Controls MVP™ pressure independent control valve.
Results
System commissioning took place in the spring of 2006 with ESC Automation reporting that the setup of the MVP valves went smoothly and took very little time.
- Higher ΔT Chilled water ΔT increased to as much as 12° C (21° F) with peak flow rate reduced accordingly.
- Comfort achieved All terminal areas were able to achieve comfort set points, with occupant complaints reduced.
- Fewer chillers needed In spite of some hot weather that summer they never had to run more than two chillers.
- Annual energy savings $40,000 Canadian dollars (approximately $39,512 USD) forecasted after the retrofit.
According to airport personnel, the Griswold Controls valves have been instrumental in the improvements achieved, primarily the MVP valves meeting the critical requirement of allowing the coils to deliver high ΔT, ensuring they reach their full potential.
Pressure Independent Control Valves
Griswold Controls’ MVP™ and PIC–V® are Pressure Independent Control Valves. Pressure independent valves dramatically reduce the energy costs, capital expenses, maintenance costs, performance issues, and capacity limitations associated with typical HVAC system pressure fluctuations. Pressure independent control valves are designed to replace the conventional 2-way control valve and balancing valve pair installed at heating and cooling coils in buildings.
To obtain the most efficient and optimal results in a system, only the necessary amount, no more and no less, of chilled or heated water must be delivered to the heating and cooling coils at all times. This saves energy, increases available plant capacity, minimizes capital expenses necessary to acquire additional capacity, and simplifies system design and control.
Every year billions of dollars are wasted due to the weaknesses in HVAC heating and cooling systems. If heating and cooling systems do not consistently operate at their designed temperature differential, energy waste occurs and money is needlessly thrown away. This unnecessary expense can be eliminated by using Griswold Controls’ pressure independent valves.
Pressure independent valves stabilize flow. With stable flows, the designed heat transfer is maintained. The result is energy savings because less flow is required to achieve the same heat transfer.
When conventional 2-way valves are used to control the flow of water through coils various actions, such as adjusting a valve or changing the pump speed, affect pressure in the distribution system. These actions in turn affect the flow through a two-way valve even if the load does not change, and may in turn change the temperature in the space. The thermostat responds and the valve modulates to bring the flow back to what is required to meet the load. Until the flow is corrected, the coil operates at an off-design point and will over – or under – condition the space.
With a pressure independent valve design set point deviation will not happen. The valve responds only to a signal from a thermostat indicating the load has changed. By responding only to the change in load, the pressure independent valve is self–balancing — it delivers the proper amount of flow to meet the requirements of the load regardless of the state of other components in the system. By stabilizing heating and cooling coil flow in spite of pressure variations, more space can be heated and cooled with less equipment and less energy, and the entire HVAC system is always in a state of constant flow balance.
Griswold Controls’ MVP and PIC–V pressure independent control valves ensure that all HVAC systems achieve steady flow and high ΔT at all loads, guaranteeing stable temperature control and better heat transfer. This ultimately results in lower energy costs and lower flow requirements for proper heat transfer.
Questions about this application? Contact info@GriswoldControls.com or 949.559.6000
MVP™ — Features & Benefits
MVP pressure independent control valves are designed to maintain the required flow rate in a system regardless of pressure fluctuations.
- Pressure independent control Provides balancing at any point below and including the maximum flow rate, eliminating hot and cold spots in a building.
- Reduces energy required Increases chiller efficiency by 15–20% and increases Delta T across coils, thereby heating and cooling more space with less equipment and energy.
- Flow stability regardless of pressure No change in flow regardless of pressure fluctuations up or downstream — requires less work for the actuator and increases actuator life.
- Multifunction modulating 2-way control Combines differential pressure control with modulating control into one compact valve housing.
- Reduces valve and actuator hunting Compensates for pressure changes in the system, increases occupant comfort, and extends both actuator and seat life.
- Low torque Reduces actuator size needed, allowing for use of a less expensive actuator.
PIC‑V® — Features & Benefits
PIC‑V & SpaceSaver PIC‑V combine a balancing valve & control valve into one, accurately maintaining flow control regardless of pressure fluctuations.
- Pressure independent control Provides balancing at any point below and including the maximum flow rate, eliminating hot and cold spots in a building.
- Flow stability & efficiency No change in flow regardless of pressure fluctuations — can heat and cool more space with less equipment & energy, requiring less work for the actuator and increasing actuator life.
- Controls flow exactly Eliminates all overflow or underflow at coils.
- Low torque Reduces actuator size needed, allowing for a less expensive actuator.
- Universal mounting plate Offers compatibility with most manufacturers’ actuators.
- Next generation triple seals & field-repairable stems Provide resistance to chemical treatments and temperature fluctuations, and allow field servicing without removing the valve.
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

Perdue School of Business Chilled Water
Salisbury University — Salisbury, Maryland
Perdue School of Business
Improved efficiency of the chilled water system at the new Perdue School of Business at Salisbury University through the use of PIC‑V® and MVP™ pressure independent control valves.
Project Overview
The Facility
This project included construction of the new Perdue School of Business and supporting infrastructure for Salisbury University. The facility provides approximately 112,800 square feet of classroom, assembly, lab, administrative, and general use areas to support current and projected undergraduate, graduate, and executive education programs. The project was designed to achieve LEED® Green Building Gold certification.
Chilled Water Plant
The chilled water system is variable primary flow, consisting of two 150-ton McQuay magnetic bearing variable speed chillers operating at a 50/50 load split, two cooling towers with variable speed fans, two redundant variable speed chilled water distribution pumps, and three condenser water pumps (one as a common backup). The system serves various air handling unit (AHU) and fan coil unit cooling coils, with AHU chilled water flow controlled by Griswold Controls PIC‑V® and MVP™ pressure independent control valves.
Air Distribution Systems
The air distribution system consists of five Variable Volume AHUs with zone reheat coils and one Single Zone Variable Volume AHU. AHUs 1, 4, 5, and 6 serve classrooms, offices, and general areas — each equipped with variable volume static pressure controlled supply fans, volumetric return fan tracking, energy recovery wheels, preheat coils, chilled water coils, air side economizers, and demand controlled ventilation. AHU-2 serves the auditorium exclusively, with a variable volume temperature controlled supply fan, preheat coil, chilled water coil, reheat coil, air side economizer, and demand controlled ventilation.
System Performance Analysis
Tim Jones, the resident operations engineer for the University, provided systems data collected through the Building Automation System (BAS). Load profiles were examined for over a year at conditions from 20% through 100% chiller capacity.
“This system meets our most demanding needs for efficiency and performance.”
— Tim Jones, Resident Operations Engineer, Salisbury University (manages 22 buildings)These observations are supported by the chilled water system’s actual temperature difference being more than 20% higher than the design of 16°F ΔT. The chilled water system operates at an average 20°F ΔT — reducing the design flow rate from 1.5 gpm/ton (16°F) to 1.20 gpm/ton (20°F). Every metric that was analyzed exceeded projections.
- Average ΔT of 20°F Exceeded the design ΔT of 16°F by more than 20% — at every load condition from startup to full load.
- Reduced flow rate Design flow reduced from 1.5 gpm/ton to 1.20 gpm/ton — directly reducing pumping energy.
- Stable AHU fan speeds Precise load tracking control kept supply air fan VFD speeds consistent and efficient across all AHUs.
- Consistent ΔT stability Temperature difference remained stable through varied AHU supply airflow and chiller capacity conditions.
- Proven under peak load System performance confirmed even on a humid 90°F day — as shown in the onboard chiller screens (Appendix A).
“We specified pressure independent control valves and designed for a high chilled water temperature difference to improve energy efficiency and reduce pumping energy specifically. The gathered data supports the performance of the system to deliver consistently high temperature differential at varied load conditions.”
— Todd Garing, PE, Mueller Associates (Design Engineer)Questions about this application? Contact info@GriswoldControls.com or 949.559.6000
This case study was coordinated by the Griswold Controls representative in Maryland in conjunction with Oscar Walker of Green Shoots Controls.
Griswold Controls Representative — Hydro Tec
Brad Walker — (410) 404-6647
Appendix A — Chiller Screen Data
Onboard chiller screens recorded during the case study, including readings captured on a humid 90°F day. Screens are typical of system performance throughout the study period.
Appendix B — BAS Performance Graphs
Have a question about this or another Griswold Controls Case Study?
Fill out the form below and someone from Griswold Controls will get back to you shortly.

Douthit Hills Dormitory

Boston University Center for Integrated Science & Engineering

Southern Tier Hi-Tech Incubator

The Van Ness Campus at Cathedral Hill Hospital

Mount Carmel East, New Ned Tower

New Trier High School

Delray Medical Center



