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Relief Valves

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

BRV Series

Models: BRV
Manufacturers: No Name

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.

  • Pressure Range (Setting): 45 – 250 PSI
  • Maximum Inlet Pressure: 400 PSI
  • Size Range: 3/4″ & 1″ NPT

MCS pop relief

MCS Series

Models: AF, AM, BF, BM, CF & CM
Manufacturers: No Name

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.

  • Pressure Range (Setting): 0.5 – 300 PSI
  • Maximum Inlet Pressure: 500 PSI
  • Size Range: 3/4″ – 2″ NPT

Slide Slide Slide

MEC MEV & MEH

MEV & MEH Series

Models: MEV25, MEV50, MEV75, MEV125, MEV250, MEH25, MEH225, MEH50 & MEH75
Manufacturers: Marshall Excelsior

Designed for installation in stationary ASME applications such as bulk plant, skid tanks, underground and above ground containers as the primary pressure relief valve.

  • Pressure Range (Setting): 60 – 460 PSI
  • Maximum Inlet Pressure: Varies
  • Size Range: 1/4″ – 2-1/2″ NPT
Belgas RegulatorP289-P289

Marshall Excelsior 1289

1289 Series

Models: 1289H, 1289HH & 1289L
Manufacturers: Marshall Excelsior

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.

  • Pressure Range (Setting): 7″WC – 75 PSI
  • Maximum Inlet Pressure: 25 – 100 PSI
  • Size Range: 1″ & 2″ NPT
225LP Low Pressure Series

Bryan Donkin 225LP

225LP & 201 Series

Models: 225LP, 225LP2, 225LP4 & 201
Manufacturers: Bryan Donkin

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.

  • Pressure Range (Setting): 12″WC – 150 PSI
  • Maximum Inlet Pressure: 30 – 375 PSI
  • Size Range: 3/4″ – 2″ NPT, 2″ Flanged
Belgas Regulator P98-P98

Marshall Excelsior 198H

198H Series

Models: 198H
Manufacturers: Marshall Excelsior

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.

  • Pressure Range (Setting): 15 – 200 PSI
  • Maximum Inlet Pressure: 300 PSI
  • Size Range: 3/4″ & 1″ NPT
630R Series

CVS 630R

630R Series

Models: 630R(LP) & 630R(HP)
Manufacturers: CVS

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.

  • Pressure Range (Setting): 3 – 250 PSI
  • Maximum Inlet Pressure: 250 PSI Above Set Point
  • Size Range: 1″ & 2″ NPT, 1″ & 2″ Flanged
  • Approvals: CRN
GV Series Gas Vent

Richards GV

GV Series Gas Vent

Models: GV
Manufacturers: Richards

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.

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