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Volkswagen Golf Mk7 Service & Repair Manual: High-pressure safety valve

The high-pressure safety valve, fitted to the compressor or receiver, opens at approximately 38 bar and recloses once pressure drops — a critical overpressure protection for the Volkswagen Golf Mk7 refrigerant circuit.

The high-pressure safety valve is fitted to the air conditioner compressor or the receiver.
The valve opens at a pressure above approx. 38 bar and closes again when the pressure has dropped (approx. 30 bar).
Not all the refrigerant is lost from the system.
Depending on the version, a transparent plastic disc may be fitted, which breaks when the valve opens.
 

High-pressure safety valve

    Questions & answers

    High-pressure safety valve — Volkswagen Golf Mk7

    What is the Golf Mk7 AC high-pressure safety valve?
    Fitted to the compressor or receiver, it releases refrigerant if circuit pressure exceeds the safe limit, preventing a burst line or compressor failure.
    Pipes and hoses in refrigerant circuit
    The mixture of refrigerant oil and refrigerant R134a attacks certain metals (e.g. copper) and alloys and dissolves certain hose materials. Therefore, always use genui ...

    Design of refrigerant circuit
    ...

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