Relief valves are installed downstream of a pressure reducing regulator and vent excess pressure in case the main regulator fails to close. They are also known as a downstream overpressure protection device, which is required when the internal relief valve of the upstream regulator is inadequate.
BRV Relief
Designed to vent directly to atmosphere in outdoor installations, these “pop” style relief valves are economical for high pressures with high flows. Brass construction with a weather cap is standard.
MCS pop relief
With a variety of sizes and options available, these “pop” style relief valves can be used both outdoors & indoors. Cast iron construction is standard and a weather cap is available.
MEC MEV & MEH
Designed for installation in stationary ASME applications such as bulk plant, skid tanks, underground and above ground containers as the primary pressure relief valve.
Marshall Excelsior 1289
Designed for high flow capacities using a large diaphragm and pitot tube booster. Its quick response and throttling capabilities make it ideal for commercial/industrial heating equipment requiring reliable protection.
Bryan Donkin 225LP
Designed for low flow capacities in a compact design. Its quick response and throttling capabilities make it ideal for commercial/industrial heating equipment requiring reliable protection.
Marshall Excelsior 198H
A back pressure regulator designed for a large variety of process applications. Used for any type of industry and ideal for liquids, air as well as gas applications.
CVS 630R
Designed for heavy duty applications. All cast iron construction with stainless steel trim as standard. Steel construction and viton diaphragm also available for high temperatures.
Richards GV
Designed to keep water, insects and debris out of all relief piping. The screen is designed to blow out in relief if it has become blocked. Other models are available.
