Failure analysis of resilient seat gate value Manufactures
The resilient seat gate value relies on the elastic pressure of the spring to lock the valve's flap or plunger and other seals. Once the pressure of the pressure vessel is abnormal, the high pressure generated will overcome the spring pressure of the safety valve, so the locking device is opened. A pressure relief channel is formed to release the high pressure. In the process of daily use, some failures may occur due to improper use or seldom maintenance. The following is the specific repair method for your reference only.
Under the normal working pressure of the equipment, leakage between the resilient seat gate value disc and the sealing surface of the valve seat exceeds the allowable degree. The reason is: there is dirt between the valve disc and the sealing surface of the valve seat. You can use the lift wrench to open the valve several times to flush away the dirt; the sealing surface is damaged. According to the degree of damage, the method of grinding or grinding after turning should be used to repair; the resilient seat gate value stem is bent, inclined or the lever and the fulcrum are deviated, so that the valve core and the valve disc are misaligned. Should be reassembled or replaced; the spring elasticity is reduced or loses its elasticity. Measures should be taken to replace the spring and readjust the opening pressure.
2. Valve flap frequency jump or vibration
The main reason is that the spring stiffness is too large. A spring with proper stiffness should be used instead; improper adjustment of the adjusting ring makes the return pressure too high. The position of the adjusting ring should be readjusted; the resistance of the discharge pipe is too large, causing excessive discharge back pressure. The resistance of the discharge pipe should be reduced.
3. Does not open when the specified pressure is reached
The reason for this is the inaccurate constant pressure. The compression of the spring or the position of the heavy hammer should be readjusted; the disc and the resilient seat gate value seat are stuck. The safety valve should be manually vented or drained regularly; the lever of the lever-type safety valve is stuck or the hammer is moved. Should readjust the position of the weight and make the lever move freely.
4. The disc does not return to its seat after discharge
This is mainly caused by the spring bending the valve stem, the improper installation position of the valve clack or being stuck. Should be reassembled.
5. The pressure continues to rise after exhaust
This is mainly because the resilient seat gate value has a small displacement and the safety discharge capacity of the equipment. The appropriate safety valve should be re-selected; the center line of the valve stem is not correct or the spring is rusted, so that the valve disc cannot be opened to the expected height, and the valve stem should be reassembled Or replace the spring; if the exhaust pipe is insufficiently cut, use an exhaust pipe that meets the safe discharge area.
6. Opening below the specified pressure
The main reason is that the constant pressure is inaccurate; the elasticity of the spring is reduced due to aging. The adjustment screw should be tightened properly or the spring should be replaced.
If the resilient seat gate value you are using fails, the editor recommends that you report for repair in time to get it repaired as soon as possible.
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