Ball valve

Abstract

The invention relates to a ball valve. The ball valve comprises a valve body, a valve ball and a sealing ring. The valve ball is enclosed through an opening in the upper part of the valve body. A valve rod is arranged on the valve ball. A valve ball chamber at the lower end of the opening is not a cylinder. Symmetrical planar parts are arranged inside the valve body and intersect with a circular-arc-shaped inner wall. The planar parts are in contact fit with a rotatable positioning piece. The positioning piece is fixed to the valve rod. The positioning piece is provided with a right angle part. The distance between the straight line border of the right angle part and the axis of the valve rod is a half the distance between the two planar parts. The invention belongs to top assembly type ball valves, and provides the novel ball valve structure with valve body inner limitation. The ball valve structure is not limited by an external structure of the valve body. Structural designs such asa handle can be simpler and more flexible, and the ball valve structure is applicable to showing installation places and is more attractive in appearance. The ball valve is simple in limiting structure, can bear higher torsion, is accurate in positioning, and has market uniqueness and competitive power.

Description

technical field [0001] The invention relates to the field of valves, in particular to a position-limiting structure of a ball valve. Background technique [0002] The opening and closing of the ball valve is simple, and the flow resistance in the open state is small, so the ball valve is widely used in various fields. [0003] The switch of the ball valve is realized by rotating the hand wheel to drive the valve ball, and the rotation angle is generally 90 degrees, so as to realize the best flow path of the ball valve and close the compression sealing area. In order to ensure the accuracy of the closing limit angle, there are many limit structures of ball valves in the prior art, such as "A Limiting Structure of Valve Ball" with publication number CN 102359616 A, the ball valve passes through the limit plane on the valve stem 3 and the valve The limit structure of the hole in the body 1 realizes the rotation limit of the valve ball, but the structure bears little torsion, a...

AI Technical Summary

Problems solved by technology

For example, in the case of surface installation, the protruding limit structure outside the valve body has poor aesthetics, the iron handle is easy to corrode and affects the limit position, the convex limit structure is simple but heavy, and the internal limit structure is light but complex in process, etc.

[0005] Top-entry ball valves are generally used for surface-mounted applications, like bathroom faucets, which require high aesthetics, and the limiting structure outside the valve body is poor in aesthetics, and some structures have patent barriers

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