Under the normal working pressure of the high temperature and high pressure gate valve, the leakage between the disc and the sealing surface of the valve seat exceeds the allowable level. The reasons are: there is dirt between the valve disc and the sealing surface of the valve seat. The valve can be opened several times with a lift wrench to flush out the dirt; the sealing surface is damaged. It should be repaired by grinding or grinding after turning according to the degree of damage; the valve stem is bent, inclined or the lever and the fulcrum are deflected, so that the valve core and the valve disc are misaligned. Should be reassembled or replaced; spring reduced or lost elasticity. Measures such as replacing the spring and readjusting the opening pressure should be taken.

1. Leak

Under the normal working pressure of the equipment, the leakage between the valve disc and the sealing surface of the valve seat exceeds the allowable level. The reasons are: there is dirt between the valve disc and the sealing surface of the valve seat. The valve can be opened several times with a lift wrench to flush out the dirt; the sealing surface is damaged. It should be repaired by grinding or grinding after turning according to the degree of damage; the valve stem is bent, inclined or the lever and the fulcrum are deflected, so that the valve core and the valve disc are misaligned. Should be reassembled or replaced; spring reduced or lost elasticity. Measures such as replacing the spring and readjusting the opening pressure should be taken.

2. Disc frequency jump or vibration

Mainly due to too much spring rate. A spring with appropriate stiffness should be used instead; improper adjustment of the adjusting ring will make the return seat pressure too high. The adjustment ring position should be re-adjusted; the resistance of the discharge pipe is too large, resulting in excessive discharge back pressure. The discharge pipe resistance should be reduced.

3. Can not open when it reaches the specified pressure

The reason for this is that the constant pressure is not allowed. The compression of the spring or the position of the weight should be readjusted; the disc is stuck to the seat. The high temperature and high pressure gate valve should be manually vented or drained regularly; the lever of the lever type high temperature and high pressure gate valve is stuck or the heavy hammer is moved. The weight should be repositioned and the lever should move freely

4. The valve disc does not return to its seat after discharge

This is mainly caused by the spring bending the valve stem, the valve disc being installed in an incorrect position or being stuck. Should be reassembled.

5. After the exhaust, the pressure continues to rise

This is mainly because the selected high-temperature and high-pressure gate valve has the safe discharge capacity of the small flat equipment, and the appropriate high-temperature and high-pressure gate valve should be re-selected; the stem center line is not correct or the spring is rusted, so that the valve disc cannot be opened to the desired height, it should be reassembled Valve stem or replace spring; if the exhaust pipe is not enough, an exhaust pipe that meets the safe discharge area should be used.

6. Less than the specified pressure to open

The main reason is that the constant pressure is not allowed; the spring's aging elasticity decreases. The adjusting screw should be properly tightened or the spring should be replaced.