Cutout cock for rail car

Abstract

A cutout cock for a rail car comprises a ball core for opening and cutting off an air supply pipeline. Special rubber composite type ball sealing gaskets are arranged on the two sides of the ball core. After a cock body is in butt joint with a connector, the ball core is located in the cock body. The cock body and the connector are sealed by a connector sealing gasket. A valve rod is installed on the upper portion of the ball core. The valve rod and the cock body are rotationally sealed by double O-shaped rings. A lower valve rod flat gasket is arranged on the contact surface of the valve rod and the end face of the cock body and used for reducing the friction of the contact surface of the valve rod and the end face of the cock body. An upper valve rod flat gasket is cushioned on the upper end face of the cock body, and then a check ring is installed. The upper valve rod flat gasket is used for reducing the friction of the valve rod and the upper end face of the cock body. A handle and a compressing cap are installed on the upper portion of the check ring and then the handle is fixed to the valve rod. The cutout cock can be normally used at the environmental temperature of -50 DEG C, compared with an existing applied cutout cock, the cutout cock is wider in application environmental temperature range and more reliable in sealing performance, the pretightening force of the ball sealing gaskets is much smaller than the pretightening force of a teflo sealing base, spanning torque of the handle is accordingly reduced, and the cutout cock is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of rail transit passenger car braking units, in particular to a cut-off plug used in the rail transit passenger car braking system. Background technique [0002] The cut-off plugs used in rail cars in the market are basically sealed with polytetrafluoroethylene sealing seats, and the operating environment temperature is ≥ -25°C. When the ambient temperature is lower than -25°C, the cut-off plugs will leak, making the track The air supply pipeline of the vehicle cannot effectively maintain the pressure, which will affect the braking safety of the train in severe cases. In order to meet the airtightness requirements of the -25°C low temperature, the current cut-off plugs are realized by increasing the compression of the sealing seat. Therefore, The operating torque of the cut-off cock is large and difficult to operate. With the large-scale operation of high-speed EMUs in my country, the sealing requirements ...

AI Technical Summary

Problems solved by technology

It solves the problem of using in the -50°C environment; and by vulcanizing the special rubber and the lining ring into one, the lining ring acts as a support and fixation, and solves the problem of insufficient hardness of the rubber itself and the movement of the position

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