Ball valve and method for implementing rigid seal between valve element and valve seat in ball valve

Abstract

The invention relates to a valve, in particular to a ball valve, which comprises a valve body, a valve element, a valve rod, a spring and a spring seat, wherein the spring is sleeved on the outer wall of the valve rod; the spring seat is connected with the spring; the valve element consists of two half balls of which one sides are pivoted with the spring seat; one end of the spring is welded with the spring seat, and the other end of the spring is welded to a lug boss of the valve rod; and one end part of the valve rod is inserted into a hole of the spring seat, and the hole is matched with the sectional shape of the end part. The ball valve can be reliably and stably sealed; and moreover, the ball valve can be flexibly opened and closed. The invention also provides a method for rigidity seal between the valve element and the valve seat in the ball valve. The method comprises the step of: rotating the valve element into an opened state and a closed state around the axis of the valve rod, wherein the valve element consists of the two half balls; when the two half balls rotate around the axis of the valve rod, each half ball rotates around a pivoting shaft through the half ball and a rotating disk are connected; and the two half balls further can rotate relative to the valve seat without friction.

Description

technical field [0001] The invention relates to a valve, in particular to a ball valve and a method for realizing hard sealing between a valve core and a valve seat in the ball valve. Background technique [0002] A ball valve is a valve with a spherical spool. When it is fully opened, it can provide a straight-through flow path with little resistance for the fluid; sphere, thereby truncating the flow. Only a small rotational torque is required to operate the valve. It has a compact structure and is easy to operate and maintain. It is suitable for direct opening and closing, and can also be used for throttling. It has been widely used in engineering. [0003] see Figure 8~Figure 9 , the existing ball valve is mainly composed of a valve body 81, a valve seat 82 and a spherical valve core 83. When the spherical valve core 83 is in a closed state, the spring 84 against the valve body 81 is squeezed in the elongation direction of the spring The valve seat 82 is such that the ...

AI Technical Summary

Problems solved by technology

The defect of this kind of ball valve is that during the opening and closing process of the valve, the relative motion between the valve seat 82 and the spherical valve core 83 always occurs in strong friction, and the valve seat 82 or the spherical valve core 83 are easy to be damaged during long-term use. damage; although STL, HS111, HS112, cobalt-sprayed cemented carbide and other materials can be used to improve the hardness of the spherical surface and the valve seat surface, the stability of the seal between the valve seat 82 and the spherical valve core 83 cannot be guaranteed;

[0004] And the effect of this hard seal depends only on the extruding of spring 84, in order to take into account the needs of flexible rotation between valve seat 82 and spherical valve core 83, this extruding force can not be very big, so can not guarantee that valve seat 82 and The reliability of the seal between the spherical valve cores 83;

[0005] In addition, in the existing structure, since the valve seat 82 and the spherical valve core 83 are always in relative motion under strong friction, the switching action of the ball valve is very inflexible.

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