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.

Do you know the steps for welding pneumatic butterfly valves
Pneumatic butterfly valves are used as compensation elements, sealing elements, connecting elements, shock absorption elements and other important components in engineering technology, and are widely used in aerospace, petrochemical, mining electronics, machinery and shipbuilding, medical and health, textile electronics, energy construction, metallurgy and other fields.
When the pneumatic butterfly valve is used as a highly flexible pipeline connecting metal equipment, when connecting with other equipment, welding method is mostly used. In the process of welding, we often use the five step welding method. Today, I will lead you to understand the detailed implementation of the five step welding method.
1. Nozzle size. During welding, the pipe length shall be measured first, and then the pipe knife shall be used to cut the pipe size.
2. Clean the pipeline. Due to the metal nature of the pipe, some waste slag will be generated due to oxidation in the pipe, and some waste slag will affect the welding effect. Therefore, before welding, we should use emery cloth or paper to grind away the waste slag in the pipe.
3. Clean the fittings with a pipe brush. Cleaning the fittings ensures that the welding hose is bonded to the tin plating.
4. Control the welding time. Generally speaking, the length of the weld bead you need depends on the length of the solder.
5. Use flare heat pipe. The torch heat pipe is mainly used to ensure that the weld of the pipe is evenly heated. Note that when using the torch, ensure that the flame is close enough to cover the diameter of the whole pipe.
The control of welding steps of pneumatic butterfly valve is helpful for users to stop welding of pneumatic butterfly valve more safely. Although the welding of pneumatic butterfly valve is not easy, the work will be better and better as long as you carefully study relevant knowledge and carefully stop the operation.