Valve stem balance mechanism of gas pressure regulator

Abstract

The invention relates to a valve stem balance mechanism of a gas pressure regulator, which comprises: a valve stem and an elastic balance film, the valve stem is sealed and fixedly connected with the inner edge of the elastic balance film; the outer edge of the elastic balance film is connected with the inner wall of the valve stem channel Sealed and fixed connection; the valve stem is covered with a fixed sealing block on the front side of the elastic balance film, and the valve stem is airtightly connected with the central through hole of the fixed sealing block; the rear side of the fixed sealing block is sealed and fixed to the outer edge of the elastic balance film Connection; in the valve stem channel, a balanced air pressure cavity is formed between the fixed sealing block and the elastic balance film; the ventilation inlet at the rear end of the valve stem communicates with the ventilation outlet on the valve stem between the elastic balance film and the fixed sealing block . When in use, if the air pressure at the outlet of the regulator fluctuates, because the balance air chamber is connected to the valve port, the air pressure in the balance air chamber is equal to the air pressure at the valve port, so the position of the valve pad will not be affected, thus improving the gas pressure regulation. Regulator accuracy and reliability.

Description

technical field [0001] The invention relates to a valve stem balance mechanism of a gas pressure regulator. Background technique [0002] At present, gas pressure regulators are widely used in urban gas pipelines. [0003] Chinese Patent Literature Publication No. CN2432411 discloses a gas pressure regulator. The valve body of the pressure regulator adopts a manifold structure, and a valve seat and a valve port are arranged inside; wherein, the main pressure regulator adopts a lever form and connects the valve port with a horizontal valve stem. horizontal structure. [0004] The weak point of above-mentioned prior art is: see figure 2 , when the air pressure at the outlet of the gas pressure regulator (that is, the outlet 45 of the valve body 2) fluctuates, the air pressure at the valve port 2-1 of the valve body 2 fluctuates accordingly. Pad 23 is easily affected by the air pressure fluctuation, so that the size of the gap between the valve pad 23 and the valve port 2-1 ...

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Problems solved by technology

[0004] The weak point of above-mentioned prior art is: see figure 2 , when the air pressure at the outlet of the gas pressure regulator (that is, the outlet 45 of the valve body 2) fluctuates, the air pressure at the valve port 2-1 of the valve body 2 fluctuates accordingly. Pad 23 is easily affected by the air pressure fluctuation, so that the size of the gap between the valve pad 23 and the valve port 2-1 fluctuates, thus affecting the pressure regulation accuracy and reliability of the gas pressure regulator, affecting safe use of gas

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