Pressure Relief Valve

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The pressure relief valve is installed on the A/C compressor or receiver/dryer.

Fig 1: Identifying A/C Refrigerant System Pressure Relief Valve

Courtesy of AUDI OF AMERICA, LLC

At a pressure of approximately 38 bar (551 psi) positive pressure, valve opens and closes again once pressure has dissipated (approximately 30 bar (435 psi)).

Refrigerant does not escape completely.

NOTE:

Depending on the version, a transparent plastic disc -B- may be installed on the pressure relief valve -A-, which breaks off as soon as the valve is activated.

Fig 2: Identifying Transparent Plastic Disc -B- And Pressure Relief Valve -A-

Courtesy of AUDI OF AMERICA, LLC

Depending on the pressure relief valve version -A-, an additional cover -C- can be slid onto the pressure relief valve -A-. If the pressure in the refrigerant circuit does rise above the pressure relief valve -A- opening pressure and the valve opens, the refrigerant does not escape in one direction, but rather it is distributed through the openings -D- under the cover -C-.