Fixed ball valve is mainly used in high pressure large diameter ball valve. According to the installation of the valve seat ring is

different from a sphere of fixed valve seat and the ball before the seal after the sealing of the seat two structures.
Sphere before

the sealing of the valve seat sealing principle: and stem as a whole sphere can slide up and down freely rotating bearing or bearings,

valve seat ring is installed in the activities of the sleeve, the sleeve used in the body 0 ring seal. Valve seat ring installed in the

sleeve by a group of pre-compression in the spring. Inlet valve seat, the valve is closed, by acting on the inlet diameter d and with the

sleeve and the gate valve diameter D.

Limited by the circumference of the ring to medium pressure on the surface pressure to the ball seat, and thus play the role of imports of

seal, can not afford the export side of the seat seal. Reverse pressure, the seat will change in Butterfly Valve the role.
Body floating ball valve

has two valve seat ring, clamping between them a sphere, sphere with holes, hole diameter equal to pipe diameter, called the entire

diameter of ball; slightly smaller diameter hole the pipe diameter, said reduced diameter ball valve.

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