Pressure Relief Valve Setting, Blow-by Inspection and Annual Calibration Requirements

Pressure Relief Valve Setting, Blow-by Inspection and Annual Calibration Requirements

Pressure relief valve protects shell and piping from overpressure rupture; Xiteliduo introduces setting and inspection specifications for piston compressor systems. Cold storage refrigeration compressor relief valve releases excessive pressure when control and safety protection fail, avoiding container burst risk. Semi‑hermetic piston compressor discharge side relief valve setpoint is 10% higher than the maximum design working pressure of the circuit. Refrigeration compressor for food cold room must keep relief valve calibration records for safety supervision and food facility audit. R404A piston refrigeration compressor relief valve blow-by can be checked by soap bubble test at valve outlet after pressure approaches setpoint. Low temperature cold storage compressor and 2‑stage piston refrigeration compressor have separate relief valves for high-stage and low-stage circuits. Chinese refrigeration compressor manufacturer data shows uncalibrated relief valves have 28% probability of failure to open or early leakage. Semi‑hermetic compressor price comparison provides relief valve as mandatory safety accessory; calibration service is charged separately. Refrigeration compressor fault troubleshooting for unexplained continuous refrigerant loss checks relief valve seat leakage and ambient heating influence. Cold chain refrigeration unit compressor skids install relief valve discharge pipe to outdoor safe area, not facing personnel passage. Relief valve cannot be blocked or locked; blind plate on relief outlet is a serious safety violation. Xiteliduo requires annual calibration by qualified institution; expired relief valve must be replaced or calibrated before use. Once the relief valve pops open, the sealing seat is easily damaged and must be inspected even if pressure returns to normal. Relief valve outlet pipeline must not be reduced in diameter; flow resistance will weaken relief capacity.

FAQ

1. How much higher is relief setpoint than circuit maximum design pressure? Setpoint 10% above the circuit maximum design working pressure.
2. What probability of failure exists for uncalibrated relief valves? 28% risk of premature leakage or failure to open.
3. What inspection method is used to check valve seat blow-by? Soap bubble leak test at relief valve outlet.
4. What safety violation is forbidden for relief valve outlet? Install blind plate or block the relief valve outlet.
5. What mandatory cycle for relief valve calibration? Annual calibration by qualified testing organization.
6. What consequence after relief valve once pops open? Valve seat may be damaged and need tightness inspection.