Southwest Irrigation, LLC
Southwest Irrigation is the leading supplier for Heap Leach Mining Systems and Agricultural Irrigation Systems in the southwest.

Pressure Reducing and
Sustaining Valve

The BERMAD Model IR-423-XZ Pressure Reducing and Sustaining Valve is a hydraulically operated, diaphragm actuated control valve with two independent functions. It sustains minimum preset upstream pressure regardless of fluctuating flow or varying downstream pressure, and it prevents downstream pressure from rising above maximum preset regardless of fluctuating flow or excessive upstream pressure.

Features and Benefits

Line Pressure Driven PRV and PSV

  • Prioritizes higher pressure zones
  • Protects lower pressure zones
  • Controls system fill-up
  • Prevents pipeline emptying
  • Protects pump from overload and cavitation
  • Compensates during groundwater drawdown

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-line inspection and service

Typical Applications

Downhill Supply Lines

  • Emptying Prevention
  • Higher Pressure Zone Prioritizing
  • Lower Pressure Zone Protection

Line Fill-Up Control
Systems Subject to Varying Supply Pressure
Energy Saving Irrigation Systems
Pump Overload and Cavitation Protection
Deep Well Pump Drawdown Compensation



  Office 520-384-9223
401 E Maley
Willcox, AZ 85643
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