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Common Faults and Maintenance Tips for Safety Valves
Safety valves are essential components in many industrial systems, ensuring pressure is released safely when it exceeds safe limits. However, they can experience various issues over time that require diagnosis and maintenance. Here are some common problems and their solutions.
1. Safety Valve Does Not Open at the Specified Pressure
This usually happens due to inaccurate pressure settings. The spring compression or weight position may need adjustment. If the disc is stuck on the seat, manually releasing pressure or draining the system periodically can help. In lever-type safety valves, a jammed lever or shifted weight should be corrected by repositioning the weight and ensuring smooth movement of the lever.
2. Safety Valve Opens Before the Prescribed Pressure
This issue is often caused by incorrect pressure settings or a weakened spring. Adjusting the screw or replacing the spring can restore proper function. Ensure the spring is in good condition and properly tightened.
3. Safety Valve Does Not Return to the Seat After Discharge
This problem may be due to a bent valve stem, improper installation of the valve flap, or sticking. Reassembly of the valve is usually required to resolve this issue.
4. Frequent Jumping or Vibration of the Valve
This is commonly caused by a spring with excessive stiffness. A spring with appropriate stiffness should be used. Improper adjustment of the adjustment ring can also lead to high return pressure, so the ring should be repositioned. Additionally, high resistance in the discharge pipe can cause backpressure, which should be reduced by optimizing the piping system.
5. Pressure Continues to Rise After Exhaust
This may occur if the safety valve is not properly sized for the system. A larger or more suitable valve should be selected. Misalignment of the valve stem or rusted springs can prevent the valve flap from opening fully, requiring reassembly or spring replacement. Also, ensure the exhaust pipe has sufficient capacity to handle the discharge volume safely.
6. Leakage Occurs
Leakage between the valve flap and seat under normal working pressure may be due to dirt buildup. Using a lifting wrench to open the valve several times can help flush out debris. If the sealing surface is damaged, it should be repaired by grinding or machining. Bent stems, misaligned levers, or worn springs can also cause leakage, requiring reassembly or replacement of parts.
A vertical safety valve guide: Click here
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