A single-spring piston type pneumatic two-position shut-off valve

Abstract

The invention discloses a single-spring piston type pneumatic two-position stop valve. The single-spring piston type pneumatic two-position stop valve comprises a cylinder, a piston, a valve body, a valve rod, a valve element and a spring; the piston is arranged in the cylinder; the valve element is arranged in the valve body; the piston and the valve element are fixedly arranged at two ends of the valve rod; the spring sleeves the valve rod; and the spring is arranged between the piston and the valve body. The single-spring piston type pneumatic two-position stop valve adopts a single-springpiston type actuation mechanism; an O-shaped ring is adopted between the piston in the actuation mechanism and the cylinder for sealing; the piston and the spring base are installed by adopting a freeflat placing and superposing mode; through the design, due to no bolt fastening between the spring base and the piston and no external limiting of the spring base, the piston is always located in a self-centering state during reciprocating acting; and single-side wear of the cylinder or the friction resistance between the piston and the cylinder is caused by no irregular force, so that actions are smoother.

Description

technical field [0001] The invention relates to the technical field of a pneumatic two-position shut-off valve, in particular to a single-spring piston type pneumatic two-position shut-off valve. Background technique [0002] Pneumatic two-position cut-off valve is a valve-controlled device used to realize the rapid cut-off or switching function of the flow pipeline. It cuts off or switches the medium (liquid, gas, steam without impurities and particles) according to the signal of the regulating instrument, so as to meet the The control system requires the control of pressure, temperature, flow and other processes. The structure of the pneumatic two-position shut-off valve mainly includes components such as valve body, actuator, valve stem, valve cover or connecting pipe, among which the valve body components include guide sleeves with dual functions of guiding and sealing; packing groups with automatic wear compensation; Compression nut with multiple functions such as tigh...

AI Technical Summary

Problems solved by technology

[0003] The pneumatic two-position cut-off valve in the prior art mainly has the following disadvantages: first, the piston will be subjected to irregular force of the return spring when it reciprocates, and the irregular force will cause local frictional resistance between the piston and the cylinder, so that the cylinder can be unilaterally In addition, the connection between the cylinder and the bracket and the connection between the bracket and the valve body are complex, and the assembly and disassembly of the actuator and the assembly and disassembly of the parts of the valve body during maintenance are less efficient; again, in the pneumatic During the operation of the shut-off valve, the internal sealing components at the stuffing box are exposed to high temperatures, and the leakage frequency of the stuffing box is likely to increase during high-frequency operations.

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