Bermad IR-430-55 Pressure Relief/Sustaining Valve



Bermad IR-430-55 Pressure Relief/Sustaining Valve

The Bermad Model IR-430-55 is a hydraulically operated, diaphragm actuated control valve that can fulfill either of two separate functions. When installed in-line, it sustains minimum preset upstream (back) pressure; alternatively, when installed as a relief or circulation valve, it relieves line pressure in excess of preset. The Bermad Model IR-430-55 either opens or shuts in response to an electric signal.


  • Downhill Supply Lines Emptying Prevention
  • Systems with Various Pressure Regimes
  • Line Fill-Up Control
  • Backup for Reservoir Supply Valves
  • Pump Overload and Cavitation Protection
  • Pump Minimum Flow Safeguard
  • Excessive Line Pressure Protection


  • Line Pressure Driven PSV Electrically Controlled On/Off
    • Controls system fill-up
    • Relieves excessive pressure protecting pump and system
    • Switches between pressure regimes
    • Wide range of pressures and voltages
  • Advanced Globe Hydro-Efficient Design
    • Unobstructed flow path
    • Single moving part
    • High flow capacity
  • Fully Supported & Balanced Diaphragm
    • Requires low actuation pressure
    • Excellent low flow regulation performance
    • Progressively restrains valve closing
    • Prevents diaphragm distortion
  • Simple In-Iine Inspection and Service


The Needle Valve continuously allows line pressure into the Control Chamber. The Pressure Relief/Sustaining Pilot which senses Upstream Pressure and the Solenoid, together control outflow from the control chamber. The pilot throttles when drops below setting*. Pressure then accumulates in the control chamber causing the Valve to throttle closed maintaining at pilot setting, and eventually closing drip-tight. The pilot releases accumulated pressure when rises above setting, thereby causing the Valve to modulate open. Closing the solenoid shuts off the Valve.


Bermad IR-430-55 Pressure Relief/Sustaining Valve Bermad IR-430-55 Pressure Relief/Sustaining Valve Brochure