Relief Valves

Weir SPM Emergency Relief Valves provide overpressure protection for reciprocating pumps, treating lines, pressure vessels and other equipment
operating under a variety of pressure and flow conditions. The valves are compact, simple to operate and rely on the system's pressure to open
when a preset pressure is exceeded, and automatically snap shut when the pressure drops.

These valves are externally adjustable, and unlike shear relief valves, which use common nails to trigger the valve, Weir SPM's emergency relief valves utilize an internal spring, nitrogen, or rig air to activate opening and closing. Valves are available in 2",3" and 4" models. Operating pressures range from 1,000 psi to 20,000 psi. Standard service and sour gas models are available.

Approximate flow rate for relief valves:

  • 2" Spring - 150 GPM Max.
  • 3" Spring - 430 GPM Max.
  • 3" and 4" Back Pressure ERV - 750 GPM Max.
  • 3" and 4" Unloading Valve - 1000 GPM Max.


As flow requirements increase, then multiple valves may be preferred, and are permissible. You may find that two of the 2" valves are a better economic combination than one 3" valve.  Multiples of either valve are allowed as long as the valves are all set within 10% of each other. Example: If a customer requires a flow of 400 GPM, he may choose to use three 2" spring operated valves or one 3" spring operated valve.

Remote Relief
Weir SPM has designed a Remote Control Panel to work in conjunction with Weir SPM's Full Bore Unloading Valve and the Emergency Backpressure Relief Valve. The Remote Control Panel's primary function is to regulate the flow of air or nitrogen to the relief valve from a designated control station, allowing the operator to change the pressure relief settings with the turn of a knob at a safe distance.

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