WW-743  Sigma EN ES Booster Pump & Pressure Sustaining Valve AS5081 / Watermark


Dֺesigned to – stand up to the toughest conditions

  • Excellent anti-cavitation properties
  • Wide flow range
  • High stability and accuracy
  • Drip tight sealing

Dֺouble chamber design

  • Moderated valve reaction
  • Protected diaphragm
  • Optional operation in very low pressure
  • Moderated closing curve

Fֺlexible design – Easy addition of features
Oֺbstacle free flow pass
Vֺ-Port Throttling Plug (Optional) – Very stable at low flow
Cֺompatible with various standards
Hֺigh quality materials
Iֺn-line serviceable – Easy maintenance


Hydraulically operated, active check, pump control & pressure sustaining valve with two independent functions: It opens fully or shuts off in response to electric signals, isolating the pump from the system during pump startup and shutdown, thereby preventing pipeline surges. While open, it sustains minimum pump discharge pressure regardless of fluctuating flow, and prevents the pump from exceeding its designed flow or power consumption. 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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