A three-position three-way control valve

Abstract

The invention discloses a three-position and three-way control valve which comprises a valve body. An upper cavity, a middle cavity and a lower cavity are formed in the valve body. Ports including A, B and C communicating with the upper cavity, the middle cavity and the lower cavity correspondingly are formed in the valve body. Seal sleeves are arranged in the upper cavity and the lower cavity correspondingly and are pressed to the corresponding valve ports under the effect of a main spring. A centre is arranged on each seal sleeve. A rotary shaft is arranged in the middle cavity. A protruding part is arranged on the rotary shaft. By rotating the rotary shaft, the protruding part on the rotary shaft is matched with the corresponding centre and overcomes the acting force of the main spring to enable the portions, at the corresponding valve ports, of the seal sleeves to be ejected open, so that the port B communicates with the port A or the port C correspondingly. A handle rotates to drive the rotary shaft connected with the handle to rotate so as to eject open the centres on the corresponding seal sleeves, and on-off of corresponding gas circuits is achieved, so that an inflating position, a pressure maintaining position and an exhausting position of a vehicle are switched stably and reliably.

Description

technical field [0001] The invention relates to a three-position three-way control valve. Background technique [0002] The structure of the valve body used to control vehicle inflation, pressure maintenance and exhaust on existing railway vehicles is relatively complex, and its operation stability is not high. During the process, the phenomenon of cross-gas is prone to occur, which will affect the stable operation of the vehicle. Contents of the invention [0003] The object of the present invention is to provide a three-position three-way control valve capable of stably switching between the inflation, pressure maintaining and exhaust positions of the vehicle in view of the above existing problems. [0004] The technical scheme of the present invention is realized in the following way: a three-position three-way control valve, including a valve body, is characterized in that: upper, middle and lower chambers are arranged in the valve body, and Ports A, B, and C that co...

AI Technical Summary

Problems solved by technology

[0002] The structure of the valve body used to control vehicle inflation, pressure maintenance and exhaust on existing railway vehicles is relatively complex, and its operation stability is not high. During the process, it is easy to have the phenomenon of cross-gas, which will affect the stable operation of the vehicle.

Images