On-off seat globe valve

Abstract

The invention relates to a clutch seat ball valve, which comprises a valve body, a valve cover, a valve stem and a ball core. The valve body on one side of the ball core is provided with a slidable valve seat base body, and the valve seat base body is provided with a seal with the ball core. The two sides of the valve seat base body are respectively provided with opening air / hydraulic pipes and closing air / hydraulic pipes which control the left and right sliding of the valve seat base body. The present invention overcomes the defects in the prior art that the common ball valve has large operating torque, easy friction and wear on the sealing surface, short service life, unadjustable pre-tightening force, and generally cannot be used for flow regulation and has a narrow application range. In the process of opening and closing, the sealing pair can be clutched to achieve no contact, no friction and zero wear, and the operating torque is small, the sealing performance is strong, and the flow adjustment function of the pipeline medium can be realized at the same time.

Description

technical field [0001] The invention relates to a clutch seat ball valve. Background technique [0002] The ball valve is a cut-off valve, which is mainly used to connect or cut off the medium flow in the pipeline. The sealing principle of the ball valve is to obtain the sealing performance according to the contact between the front left and right ends of the valve seat and the ball. The contact force (also known as the preload of the seal) The size of the force) plays a vital role in the sealing performance. The larger the pre-tightening force, the more reliable the sealing performance. With the increase of the friction between the valve seat and the ball, the friction damage of the sealing surface will be greater, and the valve's The rotational torque is proportional to the frictional force. Therefore, the opening and closing process of the ball in the ball valve is a process in which the operating torque overcomes the pre-tightening force of the seal, the friction force o...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of large operating torque, easy friction and wear of the sealing surface, short service life, non-adjustable pre-tightening force and narrow application range of ordinary ball valves in the prior art, the present invention provides a clutch Seat ball valve, the clutch seat ball valve can be clutched during the opening and closing process to achieve no contact, no friction, zero wear, and the operating torque is small, the sealing performance is strong, and at the same time it can realize the flow adjustment function of the pipeline medium

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