a hemispherical valve

Abstract

The invention provides a half-ball valve and belongs to the technical field of machinery. The half-ball valve solves the technical problem that when an existing half-ball valve is opened or closed, solid particles can be stuck between a valve core and a valve seat, so that the cutting-off effect of the half-ball valve gets poor. The half-ball valve comprises a valve rod, an upper valve body and a lower valve body, wherein a ball valve base plate is arranged between the upper valve body and the lower valve body; a through hole is formed in the ball valve base plate; both the upper valve body and the lower valve body are sealed and fixed with the ball valve base plate; a first circular groove is formed in the lower surface of the ball valve base plate; a first sealing ring is fixed in the first groove and connected with the valve core in a sealing mode; purging holes are formed inside the ball valve base plate in a radial direction; inner ends of the purging holes are communicated with the upper valve body; and outer ends of the purging holes are communicated with a purging device. The half-ball valve can avoid that solid particles adhere to the surface of the outer wall of the joint of the valve core and the first seal ring and materials leak from the connection gap of the outer wall surface of the valve body and the first seal ring, so that the sealing effect of the half-ball valve is improved.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to a hemispherical valve. Background technique [0002] The hemispherical valve and the flanged gate valve belong to the same type of valve. The difference is that its closing part is a valve core. The spool rotates around the center line of the valve body to achieve opening and closing. The hemispherical valve is mainly used in the pipeline It is used to cut off, distribute and change the flow direction of the medium. The hemispherical valve is easy to switch, small in size, and can be made into a large diameter. It has reliable sealing, simple structure, and convenient maintenance. The sealing surface and spherical surface are always in a closed state, which is not easy to be eroded by the medium. , has been widely used in various industries, among which two-piece ball valves and three-piece ball valves are a new type of valves that have been widely used in recent years. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned hemispherical valve has a good cutting effect on the liquid medium, when there are solid particles in the medium, when the hemispherical valve is opened or closed, the solid particles are likely to be stuck between the valve core and the valve seat, causing the hemispherical valve to The cut-off effect becomes worse

Images