Emergency shutoff device with both remote control and local mechanical control functions

Abstract

The invention discloses an emergency shutoff device with both remote control and local mechanical control functions. An air compressor is connected with a solenoid valve, a quick release valve and a pneumatic actuator, the pneumatic actuator drives an emergency shutoff valve, an inlet of the emergency shutoff valve is connected with a wellhead natural gas pipeline, a pressure transmitter used fordetecting the wellhead natural gas pressure and the solenoid valve are connected with a controller correspondingly, a three-way valve is connected with an outlet of the solenoid valve, an inlet of thequick release valve and a gas outlet port of a high-and-low-pressure pilot valve, the inlet of the emergency shutoff valve is connected with a high-pressure port and a low-pressure port of the high-and-low-pressure pilot valve simultaneously, and a gas inlet port of the high-and-low-pressure pilot valve is connected with the outlet or inlet of the solenoid valve. The emergency shutoff valve can be remotely automatically or manually controlled through the controller and can also be locally automatically controlled through the high-and-low-pressure pilot valve, the monitoring reliability and accuracy of the wellhead natural gas pressure are remarkably improved, and hidden dangers of safety accidents are eradicated better.

Description

technical field [0001] The invention relates to an emergency cut-off device mainly used for on-off control of natural gas wellhead gas pipes, in particular to an emergency cut-off device with both remote control and local mechanical control functions. Background technique [0002] In order to avoid the impact of too high or too low air pressure on related natural gas equipment, the natural gas wellhead gas pipe is equipped with an emergency shut-off valve. When the air pressure is too high or too low, the emergency shut-off valve is closed and the natural gas transmission is stopped, so as to realize natural gas high pressure and low pressure protection. Among them, the high pressure protection can effectively prevent natural gas leakage and other accidents due to the burst of the downstream pipeline, and the low pressure protection can effectively protect the gas well from being sealed by water due to insufficient pressure. [0003] The emergency shut-off valve generally re...

AI Technical Summary

Problems solved by technology

[0005] The defect of the above-mentioned traditional emergency shut-off device is that when the communication cable between the controller and the pressure transmitter or solenoid valve is damaged or the transmission signal is disturbed, it may cause delay or failure of the control of the solenoid valve, which eventually leads to failure of the emergency shut-off valve to open and close. Timely; the control form is single, and the automatic opening and closing of the emergency shut-off valve cannot be realized in case of failure of the pressure transmitter, controller or solenoid valve; the reliability and accuracy of the monitoring of the natural gas pressure at the wellhead are reduced, which is not conducive to eliminating the failure of the natural gas at the wellhead Potential safety accidents caused by too high or too low pressure

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