Pressure Sustaining

WW-730 Sigma EN ES Pressure Sustaining Valve

The Bermad 730 EN/ES Pressure relief/sustaining hydraulically operated control valve that can fulfil either of two separate functions: When installed in-line, it sustains minimum pre-set, upstream (back) pressure regardless of fluctuating flow or varying downstream pressure. When installed as a “branched from the line” circulation valve it relieves excessive line pressure when above maximum pre-set.
BERMAD 700 SIGMA EN/ES series valves are hydraulic, oblique pattern, globe valves with a raised seat assembly and double chamber unitized actuator, that can be disassembled from the body as a separate integral unit. The valves hydrodynamic body is designed for unobstructed flow path and provides excellent and highly effective modulation capacity for high differential pressure applications.

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WaterMark Australian Standard WSAA WaterMark, AS5081 approved


  • Fully approved AS5081 / AS4020 & Appraised to WSAA
  • Double chambered design for ultimate flexibility in safety and design
  • Y pattern extremely high flow capacity and cavitation resistance
  • Multiple throttling plugs for low flow and cavitation free operation
  • Quiet operation and fully in line serviceable

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