Overpressure closing valve

Abstract

The invention relates to an overpressure closing valve for high-pressure natural gas. The overpressure closing valve comprises a pressure sensing head, a locking release mechanism and a closing valve body, wherein the locking release mechanism is provided with a valve clack drive rod and a locking release component; a circumferential groove is formed on the valve clack drive rod; the locking release component is provided with a locking tab; a valve clack and the valve clack drive rod are fixedly connected; a valve clack spring is arranged between the valve clack and the valve body; and a valve port is formed below the valve clack; a pressure sensing skin membrane, a pressure presetting mechanism and a horizontal compression bar are arranged in the pressure sensing head; and the horizontal compression bar and the locking release component are fixedly connected. When unreasonable high pressure occurs in a pressure regulating system, the pressure sensing skin membrane is driven by the pressure, acts on the locking release mechanism through the horizontal compression bar, releases the valve clack drive rod, and allows the valve clack fixedly connected with the clack valve drive rod to drop down so as to seal the valve port. In the whole working process, delay time does not exist, gas is not diffused, pressure jump is avoided, the environment is protected, and safety effect is achieved.

Description

technical field [0001] The invention relates to a cut-off valve, in particular to an overpressure cut-off valve for high-pressure natural gas. Background technique [0002] In the gas supply system, the high-pressure gas from the high-pressure gas source is usually decompressed to the pressure required by the user, so that it can be used reliably and safely. The user's gas equipment is designed according to low pressure, and the pressure is required to be stable. In order to meet this requirement, a pressure regulating system composed of a gas pressure regulator is required to continuously supply gas to users during the process of converting from high pressure to low pressure. However, when the pressure regulator fails in an accident, high-pressure gas will escape into the user's gas equipment, causing serious combustion and explosion accidents, so the entire pressure regulating system needs safety protection. At present, the overpressure safety protection in the gas press...

AI Technical Summary

Problems solved by technology

The disadvantages of these two overpressure safety protection methods are: the emergency cut-off valve protection is converted by the overpressure signal twice, and there is a lag time. Under high pressure, especially 200bar pressure, there may be a possibility of pressure build-up; while the safety relief valve When taking off, a large amount of gas will be released, polluting the atmosphere and posing safety hazards

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