Pressure regulator with excessive flow auto-closing function by setting maximum flow

Abstract

The invention discloses a pressure regulator with an excessive flow auto-closing function by setting the maximum flow. The pressure regulator comprises a pressure regulation actuating mechanism, a pressure regulation transmission mechanism and a pilot valve, wherein a main valve core is mounted on a main valve rod; an excessive flow closing valve core forms an associated secondary throttling structure of a main throttling port and an auxiliary throttling port; the pilot valve can regulate and manipulate a throttle valve port to control the airflow in a shunting air channel according to the forward pressure and backward pressure fluctuation signals; a main film elastic assembly of the pressure regulation transmission mechanism drives the main valve rod to shift, so as to regulate the correlation opening degree of the main and the auxiliary throttling ports and carry out pressure regulation and pressure stabilization; and the maximum flow of the pressure regulator can be conveniently set, and when excessive flow exceptions such as (sudden pipe cracking and leakage accidents) occur, a gas source can be quickly closed for safety protection. The pressure regulator has the advantages of novel design, reasonable structure, convenience for regulation and setting operation, high pressure regulation accuracy, good pressure stability, strong excessive flow safety protection performance, and excellent popularization and application prospect.

Description

technical field [0001] The invention relates to a gas pressure regulating device for transporting and distributing gas, especially a pressure regulator whose maximum flow rate can be set to automatically shut off when the excess flow rate is exceeded. The maximum flow rate can be accurately set and the gas source can be quickly shut down for safety protection in the event of a sudden pipeline burst causing an over-flow leakage accident. Background technique [0002] With the rapid development of my country's petrochemical industry, abundant gas resources are provided to meet urban civil and industrial production, and the distribution of gas to many users is realized by a huge gas pipeline system widely distributed. It uses special pipe network equipment to output the gas with stable pressure to the user after the gas source is adjusted to adjust the peak and stabilize the pressure. We know that gas transmission pressure and flow are two important technical indicators for t...

AI Technical Summary

Problems solved by technology

Although the pressure regulation technology of the current pressure regulator is quite mature and has many years of experience in the pipe network system, it is needless to say that the current pressure regulator still has technical structural defects such as single function and poor safety performance: Generally speaking, it can only simply regulate and stabilize the output air pressure, but it cannot set the maximum flow rate, let alone automatically shut down the air source in the event of an "excess flow" abnormal event (such as a sudden pipe burst and leakage accident)

So far, the pressure regulators currently in use do not have the protection function for this kind of "excess flow" leakage accident

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