For industrial facility managers, it’s critical to understand common failures and solutions for full-stop Safety valves. This article analyzes six typical problems in an easy-to-understand manner to help American readers quickly master maintenance techniques. Necessary terminology is retained in the text to facilitate technician search and review.
First, the safety valve reaches the pressure does not open
✓ Possible causes:
Pressure setting error: need to readjust the spring compression or adjust the weight position
Valve sticking: monthly manual air vent/drain test is recommended
Lever jamming (lever type): check and ensure that the lever activity is smooth, the weight position is correct
II. Early Opening Problems
✓ Quick diagnosis:
Calibrate pressure settings: verify settings with a professional pressure gauge
Spring deterioration: prioritize replacement over repeated adjustments (Model: ASTM A125 standard spring)
III. Pressure Continues to Rise After Pressure Relief
⚠️ Hazard Alert:
Selection error: check the valve displacement > equipment safety relief volume
Structural problems: check stem verticality and replace rusted springs if necessary
Exhaust pipe bottleneck: ensure that the cross-sectional area of the pipe ≥ valve discharge area
Fourth, abnormal leakage treatment
⛔ Prohibit operation with disease:
Cleaning steps: use the lifting wrench several times fully open flushing
Sealing surface repair: damage ≤ 0.1mm can be ground to repair, > 0.1mm need to be turned processing
Calibration check: focus on testing the stem verticality error (allowable range ± 0.5 °)
V. Valve does not reset fault
🔧 Quick repair:
Disassembly inspection: focus on cleaning the spring chamber and guide parts
Replacement criteria: spring permanent deformation > 5% immediately replaced
Six, frequency jump / vibration problems
📈 Specialized solutions:
Spring Stiffness: Use ASME Sec VIII recommended stiffness coefficients.
Adjustment Ring Setting: Determine optimal position through step test method
Piping Optimization: Ensure discharge back pressure <10% of set pressure
Troubleshooting and Maintenance Guide for Full Poppet Safety Valves
