Downstream under-pressure automatic closing pressure regulator

Abstract

The invention discloses a downstream under-pressure automatic closing pressure regulator, which mainly consists of a main valve, a main regulation diaphragm box, a pressure regulation director ZH and a back pressure controller HK, wherein the main regulation diaphragm box is assembled on the main valve, and the back pressure controller HK is arranged at the air inlet end of the pressure regulation director ZH. The downstream pipeline pressure is guided into the back pressure controller HK to act on a back pressure diaphragm, and pressure regulation air source signals input into the pressure regulation director can be controlled. When the downstream pressure is higher than the set under-pressure value, the pressure regulation director can obtain a signal air source to carry out pressure regulation operation on the main valve, when the downstream pressure is lower than the set under-pressure value, the back pressure controller can be automatically closed, and the signal air source is cut off, so that the pressure regulator loses the control pressure, the main valve is closed, and the potential safety hazards during the maintenance operation on the downstream pipeline repair operation are thoroughly eliminated, and the gas use safety of downstream users is ensured. The downstream under-pressure automatic closing pressure regulator has the obvious advantages that the structure is simple, the production cost is low, the installation and the use are convenient, the operation is stable, the work life is long, and the safety performance is high. The downstream under-pressure automatic closing pressure regulator has very good application prospects in gas conveying industry.

Description

technical field [0001] The invention relates to an automatic shut-off pressure regulator for undervoltage after a valve, which belongs to the technical field of pressure regulation safety devices for gas transmission pipeline networks, and is particularly suitable for installation on gas transmission pipelines such as natural gas, liquefied petroleum gas, coal gas and CNG pressure regulating stations. It has obvious technical effect on improving the safety performance of the gas pipeline network. Background technique [0002] As far as the urban gas pipeline network is concerned, it is a huge pipeline system control project composed of special distribution equipment and gas pipeline networks all over the urban area. Step-down and voltage-stabilizing technology is used to realize the purpose of delivering gas with stable pressure to many users for safe use. However, due to the influence of multiple factors such as gas source quality, geographical environment and climatic con...

AI Technical Summary

Problems solved by technology

We have been engaged in the production and research of voltage regulator products for a long time and found that although the current indirect acting voltage regulator products have a good pressure regulating effect, there is no need to deny that it still has some defects in actual operation. Its main manifestations are: when the pressure of the downstream pipe network is too low or the extreme phenomenon of "burst and loss of pressure" occurs, it cannot automatically close the main valve and cut off the pilot in time. Since the pilot is not completely cut off, even when the main valve is closed There will still be a small amount of pre-pressure air source flowing into the downstream pipeline through the pilot

Obviously, this leaves a great safety hazard for downstream pipeline repair operations and for many users

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