Now our factory pneumatic ball valve can be pulled by hand and sealed reliably. However, if necessary, pay attention to the following:
1. All parts must be cleaned before assembly.
2. Improvement of sealing structure of valve seat of pneumatic ball valve During assembly, the deviation of the ball shall not exceed 3mm ball, and the end face shall exceed the positive pressure point to avoid the boss of the seal ring.
3. The surface roughness of the bottom surface and inner hole in contact with the seal ring is generally Ra less than 1.6 m. Otherwise, there will be no leakage at the ball seal and leakage at the bottom surface of the seal ring.
4. The outer diameter clearance 6 of the seal ring is related to the size of the pressing amount, which is generally 0.1~0.2 ram. If the clearance is too small, the seal ring will not deform well, and if the clearance is too large, the seal ring will deform greatly, and it is easy to fall off when assembling and fastening.
5. In the sealing test (air filling and pressure maintaining in the middle cavity, and water inlet and gas detection at both ends), the leakage defects in the inner cavity of the valve body and the blind cover casting can be solved by the infiltration method. Since the contact area of the seal ring is reduced and its service life has not been verified, a small amount of dust adsorption can be properly adjusted, and it will also be brought to the width and concave surface of the seal ring during the opening and closing process to solve the problem.

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