Hello! Ball valve
Those things about ball valves
The ball valve is a device used in the pipeline to cut off, distribute and change the flow direction of the medium. In use, it only needs to rotate 90 degrees and a small torque can be closed tightly. What should I pay attention to when using the ball valve? Here are some precautions for the ball valve, I hope it can help you.
Preparation before installation
zhun bei gong zuo
1. Ensure that the installation position of the ball valve and the pipeline are on the coaxial position. The two flanges on the pipeline should be kept parallel. Confirm that the pipeline can bear the weight of the ball valve. If the pipeline is found to be unable to bear the weight of the ball valve, provide corresponding support for the pipeline before installation.
2. Confirm whether there are impurities, welding slag, etc. in the pipeline, and the pipeline must be purged.
3. Check the nameplate of the ball valve, and perform full-open and full-close operations on the ball valve several times to confirm that the valve can work normally, and then check all the details of the valve thoroughly to ensure that the valve is intact.
4. Remove the protective covers at both ends of the valve, check whether the valve body is clean, and clean the inner cavity of the valve body. Since the sealing surface of the ball valve is spherical, even tiny debris may cause damage to the sealing surface.
Ball valve installation
guan yu an zhuang
1. Any section of the ball valve can be installed at the upstream end, and the handle ball valve can be installed at any position of the pipeline. If the ball valve of the actuator (such as gear box, electro-pneumatic actuator) is configured, it must be installed vertically at the inlet and outlet of the valve. In horizontal position
2. Install a gasket between the ball valve flange and the pipeline flange according to the pipeline design requirements.
3. The bolts on the flange need to be tightened symmetrically, successively and evenly.
4. If the ball valve adopts pneumatic or electric actuators, complete the installation of the air source and power supply according to the instructions.
Check after installation
an zhuang jian cha
1. After installation, start the ball valve to open and close several times, it should be flexible, uniform force, and the ball valve should work normally.
2. According to the design requirements of pipeline pressure, test the sealing performance of the joint surface of the ball valve and the pipeline flange after pressure is applied.
Analysis of common failures of ball valves
gu zhang fen xi
Failure: Leakage of medium
Analysis: ❶ the valve is not closed tightly ❷ the gasket is damaged
Solution: ①Close the valve again ②Renew
Note: If the temperature of the medium is too high and the medium contains more particles, it will damage the gasket
Trouble: The valve stem is not sensitive
Analysis: The bolt is too tight or the degree of tightness of the bolt varies
Solution: Loosen the gland bolts and evenly loosen the left and right nuts, and be careful not to leak
Failure: Leakage at the connection between the valve body and the pipeline
Analysis: The connecting surface is not flat, there is dirt, and the gasket is damaged
Solution: Correct the connection surface, remove the dirt, and replace the gasket
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