Multi-seal split fixed ball valve of double-piston structure

Abstract

The invention discloses a multi-seal split fixed ball valve of a double-piston structure. The multi-seal split fixed ball valve comprises a separately and oppositely arranged valve body, a ball arranged in the valve body, end covers arranged at the upper end and the lower end of the valve body, and a valve rod rotationally connected with the top of the ball. Sealed valve seat devices are arrangedon the faces, in contact with the valve body, of the two ends of the ball correspondingly, and the sealing valve seat devices are used for supporting the surface of the ball in an elastically and closely attached manner, so that the bottom of the ball and the valve body are separately arranged in a suspending manner. A sealed end cover device is arranged between one end cover and the valve rod, agrease injection device extending into the valve body is arranged on the outer wall of the valve body, and after the ball is rotated, sealing grease is injected into the butt joint clearance of the ofthe edge of an opening of a channel of the ball and the inner wall of the valve body. According to the multi-seal split fixed ball valve of the double-piston structure, a multi-sealing structure in the ball valve is achieved, and the sealing performance of the valve is ensured.

Description

technical field [0001] The invention belongs to the technical field of ball valves, and in particular relates to a double-piston structure multiple seal split type fixed ball valve. Background technique [0002] In the prior art, a large-diameter double-piston top-mounted fixed ball valve disclosed in patent No. CN201810734195.0 includes a valve body, a ball, a single-piston valve seat, a single-piston valve seat sealing ring, a double-piston valve seat, and a seat support Ring, and rubber O-ring, which is characterized in that: the double-piston valve seat and the seat support ring are installed in the corresponding valve seat groove of the valve body, and a certain number of compression springs are installed in the pressure spring hole on the back of the valve seat, so that the double-piston The valve seat is always tightly attached to the ball to form an initial seal. When there is medium pressure in the pipeline, a pressure difference is formed between the rubber O-ring ...

AI Technical Summary

Problems solved by technology

[0003] The above technical solution has the following problems. When the pipeline is dirty or has particles, the sealing surface of the valve is easily damaged, resulting in leakage; because the bottom of the ball is supported correspondingly to the bottom of the valve body, the valve stem bears the moment of the valve body, and when the pipeline medium When it increases, the valve stem is stressed, which is easy to cause damage; when leakage occurs at the inlet end, the sealing performance of the valve seat at the outlet end is affected at the same time

Images