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Pressure Relief/Sustaining Valve

The BERMAD Model IR-430-50-R is a hydraulically operated, diaphragm actuated control valve that sustains minimum preset upstream (back) pressure regardless of fluctuating flow or varying downstream pressure. It either opens or shuts in response to a remote pressure commands. When installed offline, the BERMAD Model IR-430-50-R relieves line pressure in excess of preset.

Features and Benefits

  • Hydraulic Pressure Control
    • Line pressure driven, hydraulically controlled on/off
    • Sustains supply pressure and controls system fill-up
    • Relieves excess pressure protecting pump and system
  • 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 performances
    • Progressively restrains valve closing
    • Prevents diaphragm distortion
  • User-Friendly Design
    • Easy pressure setting
    • Simple in-line inspection and service

Typical Applications

  • Computerized Irrigation Systems
  • Pressure Zone Prioritizing
  • Line Fill-Up Control
  • Line Emptying Prevention
  • Irrigation Machines
  • Distribution Centers
  • Low Supplied Pressure Irrigation Systems


[1] BERMAD Model IR-430-50-R opens upon pressure drop
     command sustaining filter back flush pressure.
[2] BERMAD Backwash Valve Model IR-3x2-350-A-I
[3] BERMAD Relief Valve Model IR-43Q-R
[4] BERMAD Backwash Flow Control Valve Model IR-470-ebKU
[5] BERMAD N.C. Pressure Reducing Hydrometer
     Model IR-920-M0-54-R