The failure of safety valve is mainly caused by improper design, manufacturing, selection or use. If these faults are not eliminated in time, they will affect the efficiency and service life of the valve, and even can not play a role in safety protection. Common faults and elimination methods are as follows:
1. Leak
Under the normal working pressure of the equipment, leakage exceeding the allowable degree occurs between the valve disc and the sealing surface of the valve seat. The reason is: there is dirt between the valve disc and the sealing surface of the valve seat. The lifting wrench can be used to open the valve several times to wash away the dirt; The sealing surface is damaged. It shall be repaired by grinding or grinding after turning according to the degree of damage; The valve rod is bent, tilted or the lever and fulcrum are deflected, so that the valve core and valve disc are misaligned. Reassemble or replace; Spring elasticity decreases or loses elasticity.
Measures such as replacing the spring and readjusting the opening pressure shall be taken.
2. Do not open when the specified pressure is reached
The reason for this is that the constant pressure is not accurate, and the compression of the spring or the position of the heavy hammer should be readjusted; The disc is stuck to the valve seat. The safety valve shall be subject to manual air release or water discharge test regularly; The lever of the lever type safety valve is stuck or the heavy hammer is moved. The position of the weight shall be readjusted and the lever shall move freely.
3. Opening under specified pressure
The main reason is that the constant pressure is inaccurate; The spring is aging and the elasticity decreases. Properly tighten the adjusting screw or replace the spring.
1. Leak
Under the normal working pressure of the equipment, leakage exceeding the allowable degree occurs between the valve disc and the sealing surface of the valve seat. The reason is: there is dirt between the valve disc and the sealing surface of the valve seat. The lifting wrench can be used to open the valve several times to wash away the dirt; The sealing surface is damaged. It shall be repaired by grinding or grinding after turning according to the degree of damage; The valve rod is bent, tilted or the lever and fulcrum are deflected, so that the valve core and valve disc are misaligned. Reassemble or replace; Spring elasticity decreases or loses elasticity.
Measures such as replacing the spring and readjusting the opening pressure shall be taken.
2. Do not open when the specified pressure is reached
The reason for this is that the constant pressure is not accurate, and the compression of the spring or the position of the heavy hammer should be readjusted; The disc is stuck to the valve seat. The safety valve shall be subject to manual air release or water discharge test regularly; The lever of the lever type safety valve is stuck or the heavy hammer is moved. The position of the weight shall be readjusted and the lever shall move freely.
3. Opening under specified pressure
The main reason is that the constant pressure is inaccurate; The spring is aging and the elasticity decreases. Properly tighten the adjusting screw or replace the spring.
Nortech is one of the leading industrial valve manufacturers in China with quality certification ISO9001.
Major products: Butterfly Valve, Ball Valve,Gate Valve, Check Valve, Globe Vavlve,Y-Strainers, Electric Acurator , Pneumatic Acurators .
For more interest, welcom to contact at: Email: sales@nortech-v.com
Post time: Jan-12-2022