PRESSURE REDUCING AND SUSTAINING VALVE The valve is a hydraulically operated, diaphragm actuated control valve that sustains mini-mum preset upstream(back) pressure and reduces downstream pressure to a constant preset maxi-mum.
TYPICAL APPLICATIONS Line Fill-Up Control Solutions; Line Emptying Prevention; Pressure Reducing Systems; Infield Filter Backwash Pressure Sustaining; Energy Saving Irrigation Systems;
FEATURES 1.Line Pressure Driven, Hydraulically Controlled *Protects downstream system *Prioritizes pressure zones *Controls system fill-up 2.Engineered Plastic Valve with Industrial Grade Design *Highly durable, chemical and cavitation resistant *No internal bolts and nuts 3.‘Y’ shape Valve Body with "Look Through" Design *Ultra-high flow capacity – Low pressure loss 4.Unitized Flexible Super Travel (FST) Diaphragm and Guided Plug *Accurate and stable regulation with smooth closing *Requires low opening and actuation pressure *Prevents diaphragm erosion and distortion 5.User-Friendly Design *Easy pressure setting *Simple in-line inspection and service
HOW IT WORKS
The pressure reducing pilot valve  is connected to the valve control chamber  via the pressure sustaining pilot valve . The pressure sustaining valve closes the valve when the upstream pressure [P1] is lower than the setting. When the upstream pressure [P1] rises above the setting, the pressure sustaining pilot valve is switched to allow the pressure reducing pilot valve to control the valve to reduce the downstream pressure [P2]. Local manual shut-off of the valve can be achieved by the manual selection device .