sphere by the stem drive and around the rotation of the axis of the stem of the valve, called ball valve.

ball valve is a kind of spherical closed a cock. With suitable seat for round sphere, the sealing stress of reason on the circumference of a circle is the same. Most of the ball valve is also used and sphere surface can be well fit the soft seat. Such as ptfe, nylon and so on, therefore, from the perspective of sealing, the idea of a ball valve, it is very good. Figure 2 - 21 valves is a typical ball valve.

movement in circular seat round his dual pressure drop and two seat has good flow control characteristics. If on both ends of the ball under the condition of high pressure drop on the duration of the partially open valve a, then along the ball on the edge of the hole sealing may slip, and may your card on the sphere in this position. So on the ball valve is suitable for manual control and cutting fluid and moderate throttling. If the flow control is automatic, ball is in continuous movement, the above drawbacks usually can be avoided.

due to wipe effect on ball movement between the seat, so the ball Industrial Valves can be used in medium with suspended particles. But with abrasion of the surface of the solid particles can damage the seat and sphere, for larger with longer and toughness fiber media use common ball valve will also appear problem, because the fiber may be wrapped around the sphere.

to make the ball valve structure of the economy, most of the ball valves with reducing size and about nominal size 3/4 of venturi flow channel ( Figure 2 - 22) 。 Reducing the pressure loss of ball valve is small, so there is usually no reason to increase the cost to use the full size of ball valve. However, some occasions must use not reducing ball valve, for example, when pipeline pigging, must be conducted must be full size ball valve.

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