The Model 770-U Flow Control Valve is a hydraulically operated, diaphragm actuated control valve that maintains pre-set maximum flow, regardless of fluctuating demand or varying system pressure.
The Model 740 Booster Pump Control Valve is a hydraulically operated, diaphragm actuated active check valve that opens fully or shuts off in response to electric signals. It isolates the pump from the system during pump starting and stopping, to prevent pipeline surges
The Model 730 relieves over pressure caused by excessive pump discharge during low demand. To keep a constant discharge pressure, the difference between pumped flow and consumer demand can be circulated back to pump suction.
Circulation valves are often exposed to severe cavitation because valve ∆P and velocity are usually high while downstream pressure is very low. On the other hand, the valves operate under these conditions for relatively short periods. Increased valve durability for applications requiring long operating periods will be achieved by using cavitation resistant materials, adding a downstream orifice, installing an upstream pressure reducing valve, increasing valve size, or any combination of these choices.
The Pressure Flow Control Metering Device (PFCMD) from Bermad, integrates a vertical turbine Woltman-Type water meter with a diaphragm actuated hydraulic control valve equipped with one, two or more pilots. The PFCMD automatically performs one, two or more independent functions, such as sustaining a preset minimal upstream pressure, maintaining the level in elevated reservoirs or sustaining maximum set flow. All functions are performed irrespective of change in upstream pressure and / or demand. Functions can easily be added or removed in a modular way. The meter accuracy is independent and not affected by the action of the valve. An adjusting screw on each pilot allows setting of the desired set-point for Pressure, Level & Flow. The valve is compatible with SCADA.