Proportional Pressure Reducing Valve Model 720-PD ■ Long downhill lines □ Serial pressure reduction □ Leakage and burst protection ■ High differential pressure systems □ Protection against cavitation damage □ Throttling noise reduction The Model 720-PD Proportional Pressure Reducing Valve is a hydraulically operated, diaphragm actuated control valve that reduces higher upstream pressure to lower downstream pressure at a fixed ratio. Features and Benefits ■ Line pressure driven - Independent operation ■ Elegant simplicity □ Most cost effective □ Simple to maintain □ Minimal external accessories ■ Variety of reduction ratios - Perfect mission matching ■ Built-in check feature - Replacing line sized check valve Major Additional Features ■ Solenoid control - 720-PD-55 ■ Closing & opening speed control - 720-PD-03 ■ Emergency pressure reducing valve - 720-PD-59 ■ Pressure Sustaining - 723-PD See relevant BERMAD publications. ■ In-line serviceable - Easy maintenance ■ Double chamber □ Moderated valve reaction □ Protected diaphragm ■ Flexible design - Easy addition of features ■ Semi-straight flow - Non-turbulent flow ■ Stainless Steel raised seat - Cavitation damage resistant ■ Obstacle free, full bore - Uncompromising reliability ■ V-Port Throttling Plug - Low flow stability

700 Series Operation The Model 720-PD is a pilotless, double chambered, control valve. The downstream pressure is applied as the closing force on the top side of both the diaphragm and the seal disk areas. The upstream pressure is applied as the opening force on the bottom side of the seal disk area. The net force, resulting from the two opposing dynamic forces acting on the actuator’s diaphragm and seal, determines the degree to which the valve is open. The valve seeks the point where these forces are equal. As the ratio of the areas of the seal disk and the diaphragm is constant, the ratio...

BERMAD Waterworks 700 Series Typical Applications There are two major applications for the Model 720-PD Proportional Pressure Reducing Valve: n Long downhill lines: o Systems A1 and A2 prevent the downhill line from exceeding its pressure rating. n High differential pressure systems: o System B reduces cavitation damage and noise level by distributing the load of the high differential pressure. o System C illustrates protecting a circulation valve from high differential pressure and resultant severe cavitation. o System D shows protecting a level control valve from high differential pressure....

Technical Data Differential Pressure Calculation 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 Standard Materials: 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...