With ball valve stem is free to

rotate in the valve seat ring. In turn, the ball hole aligned with the pipe diameter, pipe work to ensure that the media of least

resistance. When the stem turning 1 / 4 turn, the ball valve hole perpendicular to the channel, by adding to the two preload valve seat

ring and media pressure to ball firmly pressed on the export side of the seat ring, thus ensuring valve is completely sealed. This valve is

a single mandatory seal.
Floating ball valve seat materials should also consider whether the emphasis on ball withstand the load,

because the ball things, except their own weight to bear all the load and the working medium to pass seat. In addition, consider the large

diameter of the float valve in operation requires a larger force.
Floating ball valve in order to ensure tightness and reliability

when working in contact with the ball and valve seat surface, the seal should be sufficiently high pressure ratio, but shall not exceed the

allowable brass ball valve seat material than the pressure. With the groove in the seat should be close, or even a good seat on the

tightness of the sphere, the media will end along the groove leakage. Sphere should have the correct geometry and low surface roughness.

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