High-pressure reducing valve

Abstract

The invention relates to a high-pressure reducing valve. A throttling hole which is communicated with an air inlet cavity and an air outlet cavity and a valve core which axially and movably penetrates through the throttling hole are arranged in a valve seat; the valve core is provided with a throttling conical surface which is in movable and sealing fit with a lower hole opening of the throttling hole in the air inlet cavity; the upper end of the valve core supports against a piston in a matching mode; the lower end of the valve core is elastically assembled in the valve body through an offsetting spring; the throttling conical surface of the valve core is axially arranged at the middle part of the air inlet cavity just opposite to the an air inlet; the lower end of the valve core is provided with a lower valve post which is assembled in the valve seat in a sliding and sealing mode; and the diameter of the lower valve post is equal to the aperture of the throttling hole of the valve seat. In the invention, the diameter of the lower valve post is equal to the aperture of the throttling hole of the valve seat so that an axial action force of inlet pressure acting on the valve core is zero so as to eliminate the influence of the fluctuation of inlet pressure on outlet pressure and improve the pressure stabilizing precision.

Description

technical field [0001] The invention relates to a high-pressure decompression valve. Background technique [0002] In the gas control system, the pressure reducing valve is a key component in the pneumatic control system. Almost all pneumatic control systems use a pressure reducing valve. The function of the pressure reducing valve is to reduce the high pressure at the upstream inlet to the required pressure output at the downstream outlet. The application is very extensive. In the existing high-pressure direct-acting pressure reducing valve, the air inlet chamber communicates with the bottom end of the spool, and the lower end surface of the spool is simultaneously subjected to the upward axial force of the intake air pressure and the return spring, and the upper end of the spool is subjected to the outlet pressure. The downward axial force of air pressure, the resultant force of these three forces is transmitted to the piston through the valve core, so that the piston is ...

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Problems solved by technology

[0003] 1. When the inlet pressure fluctuates greatly, the inlet pressure fluctuation is transmitted to the piston through the force acting on the spool, so that the piston drives the spool to move together, changing the throttle area of ​​the orifice and changing the outlet pressure. Affect the stability of outlet pressure

[0004] 2. When the outlet pressure requirement of the pressure reducing valve is high, the design of the piston and the pressure regulating spring is difficult, and the rigidity of the pressure regulating spring is very hard, which makes the outlet pressure fluctuate greatly and the precision of the pressure regulation is low; When adjusting the pressure knob, it not only takes time and effort to adjust, but also makes the entire pressure reducing valve bulky and heavy, whi

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