Pilot type pneumatic valve capable of preventing misoperation

Abstract

Provided is a pilot type pneumatic valve capable of preventing misoperation. The pilot type pneumatic valve comprises a pilot valve and a main valve. A balanced air passage structure is arranged between the outlet end of the pilot valve and the environment outside the valve, and the balanced air passage structure is provided with a differential-pressure control normally-open valve and can enable high-pressure gas slowly leaking to the outlet end of the pilot valve to be released to the environment outside the valve through the structure; the pressure at the outlet end of the pilot valve is notincreased, and misoperation of the main valve is avoided; and the balanced air passage structure can be closed when the pilot valve is opened, and the problem of slowing down the opening speed of themain valve due to gas leakage generated by the balanced air passage structure is avoided, so that the negative influence of the arrangement of the balanced air passage structure on the pilot type pneumatic valve is prevented. By using the pilot type pneumatic valve capable of preventing misoperation, misoperation opening caused by leakage of high-pressure gas from the inlet end of the pilot valveto the outlet end can be effectively prevented, and the reliability of related equipment can be further improved.

Description

technical field [0001] The invention relates to a pilot-operated pneumatic valve, in particular to a pilot-operated pneumatic valve for preventing malfunction. Background technique [0002] Because the air flow through the pilot valve is very small, it can be as small as 1% of the rated flow of the main valve, so the size of its control and starting device is small, even for the pilot pneumatic valve used in high-pressure pipelines, its control The stiffness of the adjustment spring in the device is not large, so the pilot-operated pneumatic valve has a wide adjustment range, accurate adjustment and good stability, making it suitable for other types of valves in important fields such as overvoltage protection devices and inert gas fire extinguishing devices. substitute role. Generally used pilot pneumatic valves, because the gas in the high-pressure pipeline will inevitably slowly leak to the outlet of the pilot valve, once the gas leaked to the outlet of the pilot valve ac...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defect that the existing pilot-operated pneumatic valve is prone to malfunction, the present invention proposes a pilot-operated pneumatic valve for preventing malfunction. The technical solution adopted is: a pilot-operated pneumatic valve for preventing malfunction, including an actuator The pilot valve and the main valve with pneumatic pipeline, the pilot valve and the main valve are also equipped with valve body, valve seat, valve core, inlet port and outlet port, between the outlet port of the pilot valve and the pneumatic pipeline of the main valve There is a gas passage between the outlet end of the pilot valve and the environment outside the valve body with a balance air passage device

Images