for ball valve for cutting, using the overall welded structure is more economic. Because of its working condition is not as heavy as during adjustment, are small parts of maintenance, the valve stem and sphere subjected to dynamic loads are less, therefore, even if the connection form of loose, wear is not too big, and is of great benefit to seal it.

in floating ball and fixed ways, more inclined to use fixed ball, the ball with trunnion support.

in general, in the case of pressure is lower than PN40, from the consideration on the economic and technology, using the floating ball is more appropriate, because in this case the ball into the outlet in the small pressure drop insurable, good seal.

when diameter greater than 6, most use a fixed ball valve. This is considering the quality of this caliber the ball Industrial Valves is very big, about more than 50 kg, if the floating ball, ball pressure in the sealing seat, operation will be much on the seal seat wear. Axial seal instead of fixed ball along the flow path, would not be as big as on the seal seat wear.

for PN50 and size in pressure (above the fixed ball ball valve is used more, because if the floating ball, then medium through the ball on the export of sealing seat force in runner diameter medium pressure to calculate the area. If you use a fixed ball, medium pressure is on the end face seal seat, is produced by the force of the sphere and the seal seat clamp force to reduce a lot than the former. Thus reduce the friction, reduces the method on the surface of the ball and stem connection to the component so as to reduce the torque, improves the reliability and prolong the service life.

it is also worth noting that abroad used in oil, natural gas and inflammable medium transport pipeline ball valves, are required to have fire prevention structure, and after a fire test. For sulfide ring

condition of ball valve, also requires the use of sulfide stress cracking resistance ( SSC） Of the material. Commonly used performance parameters of the ball Industrial Valves is as follows: nominal size DN10 ~ 1400; Nominal pressure PN16 ~ 420; Working temperature ts600 ℃.

( 2) Ball valve according to structure form, the kinds of ball valve can be divided into the following types:

( 3) The characteristics of the ball valve ball valve is developed on the basis of cock a valve, it has some advantages of plug valves.

(1) in medium and small ball valve structure is relatively simple, appearance is small size, light in weight.

(2) the fluid resistance is small, all kinds of valve ball valve fluid resistance in the least. Fully open this is because the body channel, spheres, and the connection pipeline cross-sectional area is equal, and in a straight line.

3. Opening and closing fast, convenient, there is no limit on the medium flow direction.

4 open-close torque is smaller than cock. This is because the ball valve sealing surface contact area is lesser, than the cock valve opening and closing.

5. Sealing performance is good, this is because the ball valve seal material plastic, small friction factor; Fully open ball valve sealing surface are not subject to the erosion of the medium.

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