A stemless valve

Abstract

The invention discloses a valve without a valve rod and relates to the technical field of valves. The valve comprises a valve body, a valve core and a valve cap, wherein a valve hole is formed in the valve body in the axial direction, the valve core is arranged in the valve hole in a mode being capable of moving axially, and the valve cap is arranged on the circulation medium outlet side of the valve body. The valve core comprises a valve core body of a hollow structure, the hollow structure and the valve hole can jointly form a circulation medium channel, the valve cap comprises a seal pair which is matched with an end face of the circulation medium outlet end of the valve core body, and a radial flange is formed on the valve core body. The valve further comprises a distance sleeve which sleeves the outer side of the valve core body on the side opposite to the circulation medium inlet of the radial flange, a driving medium pressure cavity which extends in the radial direction and is used for driving media to circulate is formed between the distance sleeve and the surface of one side opposite to the circulation medium inlet of the radial flange, and a driving medium inlet / outlet communicated with the driving medium pressure cavity is formed in the valve body. The movement direction of the valve core and the medium inlet / outlet direction are on the same direction, so that the valve can be miniaturized.

Description

technical field [0001] The invention relates to a valve without a valve stem, which belongs to the technical field of valves. Background technique [0002] The valve stem is an important part of the valve. It is used for transmission. One end is connected to the actuator or the handle, and the other end directly drives the valve core to move or rotate to realize the valve switch or adjustment function. During the opening and closing process of the valve, the valve stem is not only a moving part, a stressed part, but also a sealing part. It is impacted and corroded by the medium, and also has friction with the packing. During the long-term use of the valve, the frequent rotation or linear movement of the valve stem will cause the packing to wear, which will reduce the sealing performance of the valve stem packing and even cause the sealing failure of the packing system, especially for toxic, flammable and explosive media. Leakage or failure will lead to major accidents. [...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned prior art can achieve the purpose of regulating the movement of the spool without the valve stem through the external fluid pressure change and the spring with the adjustment switch, it must provide enough space for the movement of the spool in the vertical direction of the medium flow. , will inevitably lead to a large increase in the size of the valve in the vertical direction of the medium flow, which is not the best solution to solve the valve stemless operation for the current market situation where the valve miniaturization is the development trend

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