Emergency valve

Abstract

The invention relates to an emergency valve which comprises a valve shell, an exhaust channel is formed in the valve shell, a main valve port is provided with a main valve element for controlling the opening section of the main valve port, the main valve element divides the exhaust channel into a high-pressure cavity communicated with a brake pipe, and the high-pressure cavity is communicated with an emergency chamber through a communication channel; the emergency chamber is provided with an exhaust valve capable of achieving communication and disconnection between an inner cavity of the emergency chamber and the atmosphere, a center rod of a piston assembly of the emergency valve is communicated with the exhaust valve when pushing the main valve element to be opened, so that the exhaust channel of the exhaust valve is communicated for exhausting, on the basis that high-pressure gas in the emergency chamber is exhausted into the high-pressure cavity through the communication channel, another discharge channel is provided for the high-pressure gas in the emergency chamber, so that the high-pressure gas in the emergency chamber can be discharged at a higher speed, and the emergency valve can be relieved to the initial state within a short time.

Description

technical field [0001] The invention relates to an emergency valve. Background technique [0002] When the train is running normally, the brake pipe is filled with high-pressure gas and kept at high pressure. When the train needs to brake, the operator will turn the brake valve in the driver's cab or compartment to the braking position, so that the brake pipe will exhaust air to the outside, and the system will The pressure in the moving tube drops and triggers the brake cylinder to work to brake the train wheels. The braking of the train is divided into conventional braking and emergency braking. During emergency braking, the brake pipe should be able to quickly exhaust the air so that the braking system can respond quickly. In order to realize the rapid exhaust of the brake pipe during emergency braking, an emergency valve is connected to the brake pipe in the prior art, and the emergency valve is used to speed up the exhaust of the brake pipe and improve the sensitivity ...

AI Technical Summary

Problems solved by technology

[0006] However, the emergency chamber of the emergency valve in the above-mentioned prior art communicates with the lower chamber only through the restricted shrinkage hole on the central rod, which causes the high-pressure gas in the emergency chamber to be discharged slowly, so that it is easy to appear after the braking is completed. The gas still takes a long time to vent, causing the emergency valve to take a long time to relieve to the initial state

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