Diaphragm valve WW-748

electrichydraulically-operatedfor control

The Model 748 Pump Circulation and Pressure Sustaining Control Valve adds the advanced active check valve logic to standard pump systems. It is a hydraulically operated, diaphragm actuated control valve that opens or shuts off in response to electric signals (during the pump starting and stopping processes) while sustaining discharge pressure. By progressively circulating pump flow, it enables a standard mechanical check valve to respond gradually during the pump starting and stopping processes, preventing pipeline surges. PRODUCT FEATURES & BENEFITS Line pressure driven Independent operation No motor required Long term drip tight sealing Off-line (circulation) installation Replaces in-line active check valve Reduced system energy consumption Low capital investment Short valve operating time Applicable to existing systems Solenoid controlled Wide ranges of pressures and voltages Low cost wiring In-line serviceable – Easy maintenance Double chamber Full powered opening and closing Non-slam opening and closing characteristic Protected diaphragm TYPICAL PRODUCT APPLICATIONS Typical Application In this system, a pump battery supplies the main line through a manifold. Where standard mechanical check valves are specified or already exist, the Model 748 enhances their function by: Preventing surge generation rather than minimizing surge damage