Reciprocating refrigeration compressor safety valve type selection, periodic inspection and replacement criteria

Reciprocating refrigeration compressor safety valve type selection, periodic inspection and replacement criteria

Safety valve is the final pressure protection device for reciprocating refrigeration compressor and system; it opens to release gas when pressure exceeds setting value to prevent overpressure explosion. Safety valve setting pressure shall be 1.1 times the maximum allowable working pressure; safety valve must be replaced immediately if seat leakage cannot be eliminated. Xiteliduo reciprocating compressor cylinder head safety valve adopts bellows type design; it is suitable for ammonia and HFC refrigerants, with recommended calibration cycle of 12 months. Small 4-cyl reciprocating refrigeration compressor safety valve blockage often results from oil sludge; oil deposits stick valve disc and disable pressure relief function. Medium 4-cyl reciprocating refrigeration compressor safety valve seat leakage may appear after repeated pressure jump; valve sealing surface gets damaged by impact. Large 4-cyl reciprocating refrigeration compressor system shall install safety valve on both cylinder head and interstage pipeline; dual protection prevents overpressure at different sections. Large 6-cyl reciprocating refrigeration compressor multi-cylinder unit needs independent safety valve for each cylinder bank; single valve failure cannot protect all cylinders. Many users skip annual safety valve calibration. Uncalibrated safety valve fails to act when overpressure occurs, raising explosion risk by 48%. Single-unit two-stage refrigeration compressor equips separate safety valves for low-stage and high-stage circuits; interstage pipeline also needs independent overpressure protection. Cascade unit high-stage reciprocating refrigeration compressor safety valve must withstand high temperature; ordinary safety valve material will lose sealing performance under continuous heat.

FAQ

Q1: What is the setting pressure rule for reciprocating compressor safety valve? A1: Set opening pressure to 1.1 times the maximum allowable working pressure. Q2: What is the recommended calibration cycle of Xiteliduo bellows-type safety valve? A2: Safety valve calibration shall be performed every 12 months. Q3: What causes small 4-cyl reciprocating compressor safety valve blockage? A3: Oil sludge deposits stick the valve disc and block the valve. Q4: What damages medium 4-cyl reciprocating compressor safety valve sealing seat? A4: Repeated pressure shock impacts and damages valve sealing surface. Q5: Where are safety valves installed on large 4-cyl reciprocating compressor system? A5: Safety valves are fitted on cylinder head and interstage pipeline for dual protection. Q6: What risk increases if safety valve annual calibration is omitted? A6: Overpressure explosion risk rises by 48%. Q7: How to arrange safety valve protection for single-unit two-stage refrigeration compressor? A7: Separate safety valves are required for low-stage, high-stage and interstage pipeline.