Decompression chamber structure of a large flow balanced pressure regulating valve

Abstract

The invention discloses a pressure reduction cavity structure for a high-flow balanced pressure regulating valve. The pressure regulating valve comprises a valve body, a valve cover, a valve spool, an input channel and an output channel, the pressure regulating valve is provided with a piston, one end of the piston contacts with the valve spool through a presser bar, the other end of the piston contacts with a regulating spring, a partition plate is arranged in the valve body and divides a cavity containing the output channel and a cavity containing the piston, a Venturi tube is arranged on the partition plate, and the output channel is communicated with the cavity containing the piston through the Venturi tube. By the aid of the technical scheme, the Venturi tube is arranged at an outlet of the valve, and different flow demands less affect outlet pressure. Therefore, pressure reduction and stabilization effects under different working conditions are achieved, and the pressure regulating valve is simple in structure, less in sealing link, sensitive in response, high in flow and stable in output pressure.

Description

technical field [0001] The invention belongs to the technical field of pressure regulating valves for liquid or gas. More specifically, the invention relates to a structure of a decompression cavity of a large-flow balanced pressure regulating valve. Background technique [0002] In the current domestic and foreign markets, large-flow regulators (such as flow rates greater than 100Nm3 / h) mostly use traditional diaphragm structures. For general industrial applications, due to single working conditions, simple use conditions, and low service life requirements , the membrane structure is suitable. [0003] However, with the application of various fuel gases such as compressed natural gas (CNG) or liquids such as liquefied natural gas (LNG) in the automotive industry, traditional diaphragm pressure regulators often show many disadvantages under complex working conditions , such as rupture and wear of the diaphragm; inadaptability to the low temperature environment; and vibrati...

AI Technical Summary

Problems solved by technology

[0003] However, with the application of various fuel gases such as compressed natural gas (CNG) or liquids such as liquefied natural gas (LNG) in the automotive industry, traditional diaphragm pressure regulators often show many disadvantages under complex working conditions , such as the rupture and wear of the diaphragm; the inadaptability to the low temperature environment; and the vibration of large flow and strong air flow, etc., directly affect the quality and service life of the product

[0004] However, other structures on the market, such as the piston structure, mostly use multi-stage decompression, which is complicated in structure and high in cost; the bellows structure has high requirements for bellows and high cost

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