(2) If the high pressure ball valve is in the closed state, it is very likely that there is some medium left in the valve body, and the valve body will also bear a certain pressure. Before the maintenance of the ball valve, it is necessary to close the shut-off valve in front of the ball valve, and then carry out the inspection work, in order to release the internal pressure of the valve body. The starting ball valve is used here, so the power supply and air supply need to be disconnected first. 　　　　

The ball of the pneumatic ball valve is elastic. The ball and valve seat seal ring are made of metal materials, and the sealing pressure is very high. The pressure of the medium itself cannot meet the sealing requirements, so it is necessary to apply external force. This valve is suitable for high temperature and high pressure media. An elastic sphere obtains elasticity by opening an elastic groove at the lower end of the inner wall of the sphere.