High Pressure Safety Valve HVAC: Description and Operation

Refrigerant System Protection

Dual Pressure Switch
The refrigerant system is protected against excessively high or low pressure. The protection is effected by a dual pressure switch located on the liquid tank. If the pressure falls out of specifications, the switch opens to interrupt compressor operation.

Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve located on the flexible high pressure hose near the compressor. When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/sq.cm, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere.