Many plants stop at “annual calibration”. After testing, they reinstall the valve and forget it. But the period between calibrations is when most failures occur. The following four maintenance steps are often missed.The main safety valve product names of China Safety Valve Network include:900 DIN Safety Valve,Air Compressor Safety Valve,A69Y Main Safety Valve,(W Series) Welding Safety Valve,Anti-sulfur Spring Type Safety Valve,ANSI Bellows Safety Valve,Air, Gas ValveAmmonia-used Safety Valve,A28X Air Compressor Safety Valve,AD Safety Valve Muffler,Bellows Spring Fall Lift Safety Valve

Hot check after first installation
A cold‑tested safety valve may behave differently at operating temperature due to pipe expansion and spring stiffness change. Within 24 hours of start‑up, verify set pressure using an online tester at working temperature.

In‑service checks
Monthly: check for abnormal vibration, liquid accumulation in discharge pipe, and intact lead seals. For valves with test levers, manual pop testing every three months prevents disc‑to‑seat sticking. Perform the test at 75–90% of set pressure – too low a pressure damages sealing surfaces.

Key indicators during overhaul
When sending a valve for calibration, measure spring free height. Discard if shortened >3% from factory spec. Check disc‑to‑guide clearance; replace if >0.1 mm. Light seat scratches can be lapped, but keep contact band width within 1.5× original.

Replace by schedule, not by failure
Even a valve that passes calibration may have a weakened spring due to long‑term high‑temperature creep. For critical services above 350°C, replace the spring every 4–5 years – do not wait for set pressure drift.

Bottom line: Safety valve management covers installation, in‑service checks, overhaul, and scheduled replacement. Calibration is just the beginning; proactive lifecycle maintenance ensures true safety.

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