Booster Pump Control and Pressure Sustaining Valve Active Check Valve WW-743 ■ Isolates system from the effects of pump starts and stops for: □ Solitary single speed pumps □ Battery of single speed pumps (add & switch) □ Battery of variable speed pumps (add) ■ Pump overload and cavitation protection ■ Controlled pipeline fill-up The Model 743 Booster Pump Control & Pressure Sustaining Valve is a hydraulically operated, diaphragm actuated active check valve that opens or shuts off in response to electric signals. It isolates the pump from the system during pump starting and stopping, to prevent pipeline surges. While open, it sustains minimum discharge pressure regardless of fluctuating flow. Major Additional Features ■ Line pressure driven □ Independent operation □ No motor required □ Long term drip tight sealing ■ Solenoid controlled □ Low power consumption □ Low cost wiring □ Wide ranges of pressures and voltages □ Normally Open or Normally Closed ■ Check feature (spring loaded type) □ Replaces line sized check valve □ Fail-safe mechanical closure ■ In-line serviceable - Easy maintenance ■ Double chamber design □ Non-slam opening and closing characteristic □ Protected diaphragm ■ Balanced seal disk - High flow capacity ■ Flexible design - Easy addition of hydraulic features ■ Pump differential pressure sustaining - 743-06 ■ Electronic control - 743-18 ■ Pressure sustaining & Pressure reducing - 743-2Q See relevant BERMAD publications.

Sequence of Operation (Normally Open Type) The Model 743 is a pilot controlled valve equipped with an adjustable, 2-Way, pressure sustaining pilot (optional with sealed spring cell), a 2-Way solenoid pilot (optional 3-Way), a limit switch and check valves. Two optional solenoid control circuits are available: ■ 2-Way solenoid (see explanations & drawings below) ■ 3-Way solenoid, controlling the pressure sustaining pilot sealed spring cell Pump Starting Procedure The needle valve [1] continuously allows flow from the valve inlet into the upper contro chamber [2]. Prior to pump start, the valve...

BERMAD Irrigation WW-700 Series Pumping Stations Typical Applications Network Over Demand Network demand is greater than pump design specifications: ■ During empty pipeline filling ■ During over demand by consumers ■ When the pump pressure specification is much higher than system resistance Any of these factors might cause pump overload and cavitation damage. The Model 743, by adding a pressure sustaining feature to the Booster Pump Control Valve, ensures that the pump operates within design specifications protecting both the pump and the system. Booster Pump Control and Pressure Sustaining Valve...

BERMAD Irrigation WW-700 Series WW-743 For full technical details, refer to Engineering Section. Pumping Stations Technical Data Flow Chart Data is for Y-pattern, flanged, PN16 valves Weight is for PN16 basic valves “C” enables removing the actuator in one unit “L”, ISO standard lengths available For more dimensions and weights tables, refer to Engineering Section Flow Rate - m3/h Data is for Y-pattern, flat disk valves For more flow charts, refer to Engineering Section Main Valve Control System Valve Patterns: “Y” (globe) & angle Size Range: 11/2–32” (40-800 mm) End Connections (Pressure Ratings):...