The Model 720 Pressure Reducing Valve is a hydraulically operated, diaphragm actuated control valve that reduces higher upstream pressure to lower constant downstream pressure regardless of fluctuating demand or varying upstream pressure.
The Model 720 is a pilot controlled valve equipped with an adjustable, 2-way pressure reducing pilot.
The restriction  continuously allows flow from the valve inlet into the upper control chamber . The pilot  senses downstream pressure. Should this pressure rise above pilot setting, the pilot throttles, enabling pressure in the upper control chamber to accumulate, causing the main valve to throttle closed, decreasing downstream pressure to pilot setting. Should downstream pressure fall below pilot setting, the pilot releases accumulated pressure, and the main valve modulates open. The V-Port plug (optional)  increases the ratio of flow to stem travel, providing more accurate, stable and smooth regulation. The integral orifice between the lower control chamber and valve outlet moderates valve reactions. The one-way flow control needle valve  stabilizes the valve’s reaction in hard regulation conditions, by restricting the flow out of the control chamber.
The downstream cock valve  enables manual closing.
Body: Stainless Steel 316 or Bronze
Elastomers: Synthetic Rubber
Spring: Galvanized Steel or Stainless Steel
Tubing & Fittings: Stainless Steel 316 or Copper & Brass
Accessories: Stainless Steel 316, Brass and Synthetic Rubber Elastomers
0.5 to 3.0 bar ; 7 to 40 psi
0.8 to 6.5 bar ; 11 to 95 psi
1 to 16 bar ; 15 to 230 psi
5 to 25 bar ; 70 to 360 psi
A well-planned pressure management program can significantly reduce not only volumes of real loss, but also maintenance costs by reducing occurrence of bursts and thereby extending the life of the system.
Common PRVs are set to maintain a constant low downstream pressure, ensuring sufficient pressure at the system’s critical point during peak demand (when line friction head loss is highest). The shaded area represents the hours and levels when pressure is higher than required.
The dynamic PRV - Model 720-4T, integrated with a PR controller, is designed to continuously correct its set value based on the momentary demand and/or minimum required pressure at the system critical point. As a result, the average network pressure dramatically decreases, reducing system leakage, bursts, maintenance, and energy costs. The shaded area represents the hours and levels of reduced leakage.
Data logging and analysis of the distribution network parameter values, enable establishment of a function for real time adjustment of pressure per system demand. The flow and pressure transducers continuously transmit to the controller, which reacts by adjusting the Model 720-4T according to the pre-established function. The controller’s program can be changed either through a laptop computer or a pocket PC, SMS, or any other communication method available.
The PRV model 720-45 integrated with the BE-PRV-DL controller is designed to maintain two pressure reducing set-point values. The BE-PRV-DL controller is programmed to switch between the two pilot valves and therefore change the pressure reducing set-point. The BE-PRV-DL control program can adapt to special days, or seasons of the year, as well as log pressure and flow data.
Water supply system design requirements for hi-rise buildings present unique issues:
The Model 720 Pressure Reducing Valve together with BERMAD’S accumulated experience, address these issues and provide appropriate solutions.
In addition to the standard pressure reducing system, for a hi-rise building, BERMAD recommends the system also include Pressure Switches to signal a control panel of excessive downstream pressure.
When dealing with high differential pressure systems in lower zones of a hi-rise building, BERMAD recommends a two-stage pressure reducing system. In addition to the typical higher zone installation, this high differential pressure system also includes:
Proportional Pressure Reducing Valve Model 720, as the first pressure reducing stage, absorbs part of the high differential pressure. By spreading the load of pressure reduction on to two components, cavitation damage and noise are reduced.
Network design requires establishing various pressure zones due to topography, distances, demands, energy costs, reservoir availability, etc.
The pump supplies water to the network and to the reservoir. System pressure is too high for the residential neighborhood, requiring a pressure reducing system.
In addition to the Model 720 Pressure Reducing Valve, BERMAD recommends that the system also include:
First stage reduction is achieved by using the proportional pressure reducing valve model 720-PD. This reduces cavitation damage and noise level by distributing the load of the high differential pressure.
Size Range: DN40-900 ; 11/2–36”
End Connections (Pressure Ratings):
Flanged: ISO PN16, PN25 (ANSI Class 150, 300)
Threaded: BSP or NPT
Others: Available on request
Valve Patterns: “Y” (globe) & angle, globe (DN600-900 ; 24”-36”)
Working Temperature: Water up to 80°C ; 180°F
Body & Actuator: Ductile Iron
Internals: Stainless Steel, Bronze & coated Steel
Diaphragm: Synthetic Rubber Nylon fabric-reinforced
Seals: Synthetic Rubber
Coating: Fusion Bonded Epoxy, RAL 5005 (Blue) approved for drinking water or Electrostatic Polyester Powder
Please specify the requested valve in the following sequence: (for more options please contact us)