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How does a PRV pressure relief valve work?

Category: Camping & Leisure, Home & Commercial, Safety

The PRV pressure relief valve is integrated into the LPG pressure regulator and protects against overpressure by blowing out gas into the environment.

Druckregler mit Sicherheitsabblaseventil
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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).

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.

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.

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.

Author

Editors GOK Blog
The articles are written by specialist authors in the fields of LPG, fuel oil, liquid media, tank management and safety engineering, who contribute their expertise from product management, development, technical customer support, training and standardisation activities. The members of the editorial team have many years of practical experience in the planning, application and further development of technical solutions for the safe supply of LPG and liquid fuels. Several authors are actively involved in specialist committees and working groups of the DVGW, DVFG and figawa, as well as in national and European standardisation committees. The team includes, among others, experts certified in accordance with G 607 and G 608, competent persons in accordance with the TRF, and specialists who contribute to the development and evaluation of technical regulations and industry standards. In addition to providing information about GOK products and solutions, the editorial team focuses on sharing knowledge relating to safety, regulations, maintenance, operation and future technologies in the field of LPG and liquid media.

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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.