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You are here: Home1 / Blog2 / LPG Leisure Time3 / Gas Regulator, Gas Cylinder & more4 / How does a PRV pressure relief valve work?

How does a PRV pressure relief valve work?

31. March 2016/in Gas Regulator, Gas Cylinder & more, Gas Regulator, Gas Cylinder & more, LPG Everyday, LPG Leisure Time
Approximate reading time: 1 minute

The pressure relief valve is a safety device integrated into the pressure regulator. It discharges LPG into the environment as soon as the pressure exceeds the defined maximum value.

Either the PRV (Pressure Relief Valve) is the only safety device of the pressure regulator or it is combined with the OPSO (Over-Pressure Shut Off).

Inhaltsverzeichnis

  • PRV as sole safety device
  • PRV combined with OPSO
  • What can you do if the PRV has discharged?

PRV as sole safety device

  • Dirt gets stuck to a narrow part of the pressure regulator.
  • The pressure rises continuously and exceeds the maximum permissible value.
  • The overpressure raises the diaphragm.
  • The position change of the diaphragm causes a gap to open at the valve lever.
  • The overpressure escapes from the ventilation opening in the cover of the pressure regulator.
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PRV combined with OPSO

  • The OPSO responds to overpressure and blocks the gas flow.
  • Strong sunlight or increasing temperatures will cause a pressure increase in the line and pressure regulator.
  • The overpressure raises the diaphragm.
  • The position change of the diaphragm causes a gap to open at the valve lever.
  • The overpressure escapes from the ventilation opening in the cover of the pressure regulator.
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Once the overpressure has been relieved, the PRV closes automatically, whether it is the sole safety device or combined with an OPSO.


What can you do if the PRV has discharged?

For pressure regulators with PRV as a single safety device as well as in combination with the OPSO, we recommend that you consult a specialist who checks the system.

Tip for the specialist: Take a look at our article on how to release the OPSO again.

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Approximate reading time: 8 minutes

Information regarding technical systems

This blog will never ask members of the public or unqualified persons to make changes to or fiddle around with technical systems themselves.

In accordance with the Industrial Safety Regulation (BetrSichV), a qualified person must take care of a system which requires monitoring.

A qualified person is someone who has the specific specialist knowledge required. This knowledge is gained by way of a professional apprenticeship, corresponding professional experience or current occupational activity.

Please note that the texts are based on information, regulations and standards for Germany. Please always check the rules and regulations in the relevant country of destination and consult specialists if necessary.

Regler- und Armaturen-Gesellschaft mbH & Co. KG

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97340 Marktbreit / Germany

Phone: +49 9332 404-0
Fax: +49 9332 404-49

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Website: www.gok.de

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