Pneumatic or hydraulic single-seat regulating valve

Abstract

The invention discloses a pneumatic or hydraulic single-seat regulating valve which comprises a valve body, a valve cover and a valve stem. The valve body is internally provided with an inlet channeland an outlet channel, and the inlet channel and the outlet channel are in communication through a central flow channel. The pneumatic or hydraulic single-seat regulating valve is characterized in that a first cavity, a second cavity, a third cavity and a fourth cavity are arranged on the positions, corresponding to the outer periphery of the central flow channel, on the valve body in order from inside to outside; a valve seat is arranged in the first cavity in a manner of being capable of moving up and down, the upper end of the valve seat movably extends out of the first cavity, the lower end of the valve seat is provided with a step, the step separates the first cavity into an upper piston cavity and a lower piston cavity which are closed, the upper piston cavity communicates with the inlet channel, and the lower piston cavity communicates with the outlet channel; a scraping sleeve is rotationally arranged in the second cavity, an inner cavity is arranged in the scraping sleeve, a push rod capable of moving up and down is arranged in the inner cavity, and a scraping head capable of moving left and right is arranged in the upper portion of the scraping sleeve; a control sleeve and a conversion sleeve are arranged in the third cavity; and a switch rod which can be floated up and down is arranged in the fourth cavity. The pneumatic or hydraulic single-seat regulating valve effectively prevents s sealing pair from being blocked and damaged.

Description

technical field [0001] The invention relates to an improved invention in the field of regulating valves, in particular to an improved invention of a pneumatic or hydraulic single-seat regulating valve. Background technique [0002] For traditional control valves, if the medium used contains solid particles, when the opening of the control valve is relatively small (the distance between the sealing surface of the disc and the sealing surface of the valve seat is relatively close), the solid particles are easy to block the sealing pair, causing The valve is stuck and the sealing surface is damaged. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pneumatic or hydraulic single-seat regulating valve that prevents the sealing pair from being blocked and damaged. [0004] In order to solve the above technical problems, the present invention is realized by adopting the fo...

AI Technical Summary

Problems solved by technology

[0002] For traditional control valves, if the medium used contains solid particles, when the opening of the control valve is relatively small (the distance between the sealing surface of the disc and the sealing surface of the valve seat is relatively close), the solid particles are easy to block the sealing pair, causing The valve is stuck and the sealing surface is damaged

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