[Science Stickers] Little Valve University asks, let’s take a look at the ball valve

HELLO

​Hello! Ball valve

Those things about ball valves

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.

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

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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.

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.

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