The purpose of this Refrigerant Pressure Relief Valve Type Sh 56 Series is to quickly release excessive pressure in vessels containing refrigerant. It is constructed with careful adherence to specifications for safety relief devices. According to this regulation, all refrigeration systems pressure vessels must be safeguarded by a pressure release mechanism or another authorized method of safely relieving pressure in the case of a fire or other abnormal circumstances. There is a fixed pressure option for this Refrigerant Pressure Relief Valve Type Sh 56 Series.