ball Industrial Valves USES direct ball Industrial Valves used in the cutting medium, the most extensive. Multipass ball valve can change the flow direction of medium or allocated, ball valve has been widely used in long distance pipeline. Medium flow direction of the ball valve is not restricted. Ball valve pressure, size using range is wide, but using temperature restricted by sealing ring material and restriction.

because of the hard sealing ball valve ( Figure 2 - 23) The emergence of the ball Industrial Valves for pressure and the suitable temperature with sharply higher, applicable temperature by - 50 ~ 200 ℃, to - 200 ~ 450 ℃, and 600 ~ 700 ℃, apply pressure by PN40, raise the PN320, particularly the emergence of all kinds of lining ball valve, make the suitable medium of ball valve to further expand.

ball valve fault is: sphere machining and grinding are more difficult.

the structure of ball valve

ball valve consists of body, ball, seat, stem and transmission device and so on, as shown in FIG. 2 21.

(1) the body according to the body channel form, ball valve can be divided into direct ball valve ( Figure 2 - 21) , three-way ball valve ( Figure 2 - 25) And four-way valves ( Figure 2 - 26) 。 Body structure with integral, two chip, chip, and the fraction of the four, integral valve is commonly used in the small ball valve; Two plate and three plate body is suitable for medium and large diameter ball valve, the fraction is mainly used in coal chemical industry body with hard sealing ball valves.

(2) sphere is opening and closing of valve, the sealing surface is a sphere surface. A sphere surface roughness accuracy is higher. Direct ball valve, the sphere is direct channel; Three-way ball valve ball channel L, T and Y three, its distribution form is the same as the plug valve. According to the fixed way of sphere in the valve body, ball valve can be divided into two kinds of, floating ball valve and the fixed ball valve.

。 Floating ball valve. As shown in figure 2 - 21, the sphere is to rely on two seat holding, can float. In medium pressure sphere is pressed close to the export side of the sealing ring, sealing. This kind of simple structure, single seal, sealed performance is good, but the sealing surface tolerance is very big, so the opening and closing force is big. Generally applicable to medium and low pressure, medium and small diameter of the valve ( ≤ DN200) 。

b。 Fixed ball valve. As shown in figure 2 - 23, the ball is composed of upper and lower stem bearing fixed, can only turn, do not produce horizontal movement. In order to guarantee the sealing, it must be able to produce thrust floating seat, make the seal pressure on the ball. This structure is complex, appearance size, opening and closing torque is small. Applicable to high pressure, large diameter ball valve ( ≥ DN200) 。

(3) the lower stem connection with sphere, can be driven in a sphere. Sphere of opening and closing action according to pressure, diameter of the size of the wrench, or in all kinds of linkage, pneumatic, hydraulic, electric or transmission.

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