If you want to distinguish between good and bad, you should first check the appearance, whether the surface is processed smoothly, and whether the assembly is fine. If the requirements are high, non-destructive testing can be performed to see if there are significant defects on the surface. Of course, if you want to know the quality of the material, you can use a spectrometer to test it to see if it meets the GB regulations. Additionally, you can apply pressure to determine the sealing performance and whether the leakage meets your needs. The rest can only be experienced through the use process.

The working principle of ball valves:

A ball valve is a valve that is driven by the valve stem and rotates around the shaft. It can also be used for fluid regulation and control, with hard sealed V-shaped ball cores and hard alloy hard valve seats having high shear forces, especially suitable for media containing fibers, small solid particles, etc. Multi way ball valves can not only flexibly control the convergence, diversion, and switching of medium flow in pipelines, but also close any channel and connect the other two channels. Generally installed horizontally in pipelines.

What are the advantages of ball valves

1。 Thrust bearings can reduce the friction torque of the valve stem, making it stable and flexible for long-term operation.

2。 Anti static function: There is a spring between the ball, valve stem, and valve body, which can remove static electricity generated during the switching process.

3。 Due to the excellent self-lubricating performance of materials such as Teflon, the friction loss with the ball is small, and the service life is long.

4。 As shown in. Low fluid resistance: Ball valves have the lowest fluid resistance among all valve types. Even small-sized pneumatic ball valves have relatively small fluid resistance.

5。 Reliable valve stem sealing: Due to the fact that the valve stem only rotates without lifting, the valve stem packing seal is not easily damaged, and the sealing capacity increases with the increase of medium pressure.

6。 Good sealing performance of the valve seat: The sealing ring made of elastic materials such as Teflon is easy to seal, and the sealing ability of pneumatic ball valves increases with the increase of medium pressure.