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.
Click an image to enlarge
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.
See product availability chart to the right.
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.
