Pneumatic ball valves can be divided according to the structure:
First, the floating pneumatic ball valve
The ball of the pneumatic ball valve is floated. Under the action of the medium pressure, the ball can be displaced and pressed against the sealing surface at the outlet end to ensure the outlet end is sealed.
The floating pneumatic ball valve has a simple structure and good sealing performance, but the load of the ball subjected to the working medium is completely transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring data can withstand the working load of the spherical medium. This structure is widely used in medium and low pressure ball valves.
Second, fixed ball pneumatic ball valve
The ball of the pneumatic ball valve is fixed and does not move after being pressed. The fixed ball valve has a float valve seat. After the medium pressure, the valve seat moves, so that the seal ring is pressed against the ball to ensure the seal. Usually mounted on the upper and lower shafts of the ball, the operating torque is small, suitable for high pressure and large diameter valves.
In order to reduce the operating torque of the pneumatic ball valve and the firmness of adding the seal, in recent years, an oil-sealed ball valve has been presented, which injects the lubricating oil between the sealing faces to form an oil film, which enhances the sealing property and reduces the operating torque. It is more suitable for high pressure and large diameter ball valves.
Third, elastic ball pneumatic ball valve
The ball of the pneumatic ball valve is elastic. Both the ball and the seat seal are made of metal materials. The sealing pressure is very large. The pressure of the medium itself cannot meet the sealing requirements, and an external force must be applied. This valve is suitable for high temperature and high pressure media.
The elastic sphere is made by opening an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When the channel is closed, the wedge of the valve stem is used to open the ball and press against the seat to seal. Before the ball is rotated, the wedge head is loosened, and the ball is restored to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the conflict of the sealing surface and the operating torque.
Pneumatic ball valves can be divided into straight-through, three-way and right-angle according to their channel orientation. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.
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