A ball valve rotary limit mechanism

Abstract

Provided is a ball valve rotation limit mechanism. The ball valve rotation limit mechanism is located at a drive device installation port of a ball valve, and comprises a rotation limit block and a connection sleeve used for limiting in cooperation with the rotation limit block. The connection sleeve is connected with a ball body through a connection block; the rotation limit block is fixedly installed inside a valve body installation groove and sealed with a valve body through a sealing workpiece; limit protrusions matched with the rotation limit block are arranged in the circumferential direction of the connection sleeve; the angle between the two limiting faces of each limit protrusion is 90 degrees; and the connection sleeve is sealed with the rotation limit block through a sealing workpiece. The ball valve rotation limit mechanism has the beneficial effects that by the connection between a connection sleeve structure and a drive device, a conventional valve rod structure is replaced, and an installation space is reduced on the one hand; the situation that a switch is not in place due to a valve rod and the sealing problem occurs is prevented on the other hand; and the limit function is achieved through the cooperation of the rotation limit block and the limit protrusions arranged on the connection sleeve, and the limit is more reliable compared with valve rod limit.

Description

Technical field [0001] The invention relates to a ball valve, in particular to a rotation limiting mechanism of the ball valve. Background technique [0002] Ball valves are widely used in various industries because of their small size, simple structure, and convenient maintenance. The sealing surface of the valve seat and the sealing surface of the ball are often in contact, so they are not easily eroded by the medium and have a long service life. [0003] The ball valve realizes the function of cutting off or connecting the medium by rotating the valve stem so that the ball rotates around the vertical line of the center line of the valve body channel. After the valve is opened and closed in place, the ball must be reliably limited. However, due to improper assembly, Problems such as poor working conditions and deformation of the valve stem lead to unreliable valve stem limit, and finally problems such as the valve not being tightly closed or fully opened. For this reason,...

AI Technical Summary

Problems solved by technology

[0003] The ball valve realizes the function of cutting off or connecting the medium by turning the valve stem so that the ball rotates around the vertical line of the center line of the valve body channel. After the valve is opened and closed in place, it must ensure that the ball is reliably limited. However, due to improper assembly, Poor working conditions, deformation of the valve stem and other problems lead to unreliable limit of the valve stem, and finally problems such as the valve not closing tightly or opening completely

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