Valve

Abstract

The present invention discloses a kind of valve which can be used in the medium-pressure or high-pressure environment in which the fluid can be bidirectionally flowed, and can use smaller switching moment to provide enough seal specific pressure and is simple in structure. Said valve is characterized by that in the sealing cavity of said valve a lower seal surface and an upper seal surface are coaxially superimposed, and a seal unit formed from at least one semi-moving plate and one moving plate is arranged opposite to said lower seal surface and upper seal surface, and on the lower seal surface and upper seal surface and on the semi-moving plate and moving plate the axial through holes are cut and arranged along the circumferential direction respectively. The spacing structure of the semi-moving plate and moving plate can make these through holes be communicated with flow channel, and when the semi-moving plate and moving plate are relatively turned, the relative sliding of superimposed contact surfaces can make the semi-moving plate and moving plate produce relative axial movement.

Description

technical field [0001] The invention relates to a valve, especially a valve used in medium and high pressure environments with two-way flow of fluid. Background technique [0002] Generally, there are four main indicators to measure valve performance: tightness, reliability, action and adjustability, and valve resistance. Action and adjustability usually refer to the switching torque and switching speed of the valve. The sealing performance and sealing reliability of the valve are the valve The biggest difficulty in design and manufacture. The structure type of the valve determines the movement trajectory of the valve movable body, and then determines the limit that the above performance indicators can achieve. At present, the common valves in the industry include gate valves, butterfly valves, ball valves, plug valves, globe valves and other basic structural types. The seal is divided into outer seal and inner seal. In the case of the same material and pressing force, the...

AI Technical Summary

Problems solved by technology

However, since the open valve has two sealing surfaces, if the operating mechanism is in contact with the valve body on the transmission route of the pressure of the two valve plates before and after the valve is closed, it is easy to cause over-positioning problems, making the two sealing surfaces practical. Only one of them works, which makes the design of the internal operating mechanism of the va

Images