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

Quick Pressure Relief Valve

The Model 73Q Quick Pressure Relief Valve is a hydraulically operated, diaphragm actuated control valve that relieves excessive system pressure when this pressure rises above the pre-set value. It immediately, accurately, and with high repeatability responds to system pressure rise by fully opening. The Model 73Q provides smooth drip tight closing.

Features and Benefits

Hydraulic actuation

  • Independent operation
  • Long term drip-tight sealing
  • Long term setting stability
  • Wide setting range
  • Tight setting window
  • Minimal hysteresis

Double chamber design

  • Moderated valve closing (no surges)
  • Protected diaphragm

Obstacle free, full bore – Uncompromising reliability
Balanced seal disk – High relief flow capacity
Manual test valve – No setting change required

Typical Applications

The Model 73Q Quick Pressure Relief Valve protects against:

  • Momentary high pressure peaks Failure of other system components
  • Excessive pressure from another source Static condition leaking of pressure reducing valves



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