Limiting anti-rotation fixed ball valve

Abstract

The invention discloses a limiting anti-rotation fixed ball valve. The limiting anti-rotation fixed ball valve comprises a valve body, a valve seat, a valve stem and a ball body. The ball body is located in a ball body cavity of the valve body. The lower end of the valve stem penetrates through a top flange, a gland flange and the valve body and then is fixedly connected with the upper end of theball body. A key is arranged on the periphery of the upper end of the valve stem in the axial direction of the valve stem. The upper end surface of the top flange is provided with a limiting groove with the inner angle being a right angle. The lower end of the key extends into the limiting groove. The rotation angle of the valve stem is limited to be within 90 degrees by the limiting groove. The upper end and the lower end of the gland flange are connected with the lower end of the top flange and the upper end of the valve body through concave-convex cooperation in a clamped and connected mode. At least one of the abutting face of the gland flange and the valve body and the abutting face of the top flange and the valve body is a plane. Through a multi-stage limiting structure, when the valve stem drives the ball body to rotate, the other structural parts except the ball body are not rotated, the structural stability of the fixed ball valve is improved, and the effect that a ball body passage and the axis of passages on the two sides are located on the same line when the valve is completely opened.

Description

technical field [0001] The invention relates to the technical field of ball valves, in particular to a position-limiting anti-rotation fixed ball valve. Background technique [0002] The fixed ball valve is used to cut off or connect the medium in the pipeline. Different materials can be used to transport water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, etc. It is widely used in petroleum refining, long-term Pipeline, chemical, paper, pharmaceutical, water conservancy, electric power, municipal, steel and other fields. [0003] The fixed ball valve has small torque, small deformation of the valve seat, stable sealing performance and long service life. The upper and lower shafts are equipped with PTFE bearings to reduce friction and save labor. Fixed ball valves are generally full-bore: that is, the flow aperture of the valve is consistent with the inner diameter of the pipeline, and can be directly pigged with a pig when installed on the pipeline. Howeve...

AI Technical Summary

Problems solved by technology

Fixed ball valves are generally full-bore: that is, the flow aperture of the valve is consistent with the inner diameter of the pipeline, and can be directly pigged with a pig when installed on the pipeline. However, the traditional design of the drive chain limit anti-rotation fixed ball valve has complicated processing procedures and production The cycle is long, and the accuracy requirements are more stringent than conventional valves

After the assembly is completed, it is often found that the valve drive chain will rotate slightly with the drive device and the positioning of the limit mechanism is not accurate, resulting in the valve switch position not being in place, affecting the service life of the valve. In production, it is necessary to disassemble, analyze and repair parts again. , the production cycle is long, the labor cost is very expensive, and its application range is greatly limited

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