The invention relates to the technical field of check valves, aims to solve the problems that when the pressure of the input end of an existing check valve is reduced, an air path between the input end and the output end is disconnected, and the requirement that the output end is reduced along with the pressure of the input end cannot be met, and provides a check valve for a railway braking system. The valve piston is slidably connected with the valve body; a pre-control chamber, an input chamber and an output chamber are sequentially arranged in the valve body, the pre-control chamber is located at one end of the valve piston, an air hole is formed in the valve piston, and the air hole is used for communicating the pre-control chamber with the input chamber; the other end of the valve piston is connected with a valve seat, and the valve piston drives the valve seat to move, so that the valve seat is in sealing contact with or separated from the valve body, and the input cavity and the output cavity are disconnected or communicated; the pressure of the output end can be reduced along with the pressure of the input end, when the pressure of the input end is reduced to zero, the output end can keep certain closing pressure, the closing pressure is adjustable, and the requirements of different working conditions are met.
本发明涉及止回阀技术领域,旨在解现有的止回阀当输入端压力下降时,输入端和输出端之间气路将会断开,无法满足输出端跟随输入端压力下降的要求的问题,提供一种铁路制动系统用止回阀,包括阀体,阀体的内部设置有阀活塞,阀活塞与阀体滑动连接;阀体内依次设置有预控腔室、输入腔室和输出腔室,预控腔室位于阀活塞的一端,阀活塞上开设有气孔,气孔用于将预控腔室与输入腔室连通;阀活塞的另一端连接有阀座,阀活塞带动阀座移动,使得阀座与阀体密封接触或分离,从而将输入腔室和输出腔室断开或连通;本发明能够实现输出端跟随输入端压力下降、当输入端压力降至零时,输出端能够保留一定的关闭压力,且关闭压力可调,满足不同工况的要求。
Check valve for railway braking system
一种铁路制动系统用止回阀
2025-03-21
Patent
Electronic Resource
Chinese
DOUBLE CHECK VALVE, PNEUMATIC BRAKING DEVICE, AND VEHICLE
European Patent Office | 2023
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