Push-pull pressure control valve

Abstract

The invention discloses a push-pull pressure control valve, which comprises a valve body and an acting plunger, wherein the valve body is through from front to back; the acting plunger is arranged in the valve body; one end of the acting plunger is connected with a control mechanism by a connection plate, while the other end of the acting plunger is provided with a locating mechanism; the valve body is provided with air holes; the acting plunger is provided with a vent groove for controlling the air holes on the valve body to be communicated with one another; and the mutual communication between the air holes in the valve body is switched by controlling the position of the acting plunger in the valve body. According to the push-pull pressure control valve, the pressure control for an air cylinder and an acting pipe can be easily balanced by controlling the placement position and time of a handle to achieve the aims of giving an automatic braking command and a separate braking command. The push-pull pressure control valve is compact in structure, small in volume, light in weight, good in processing technology, convenient to assemble, and very simple in the mounting manner.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to a push-pull pressure control valve. Background technique [0002] The existing pressure control valve is mainly realized by two DK-1 braking valves. When the switching plunger of the DK-1 braking valve is at the air position, it is used as a large gate. When the switching plunger of the DK-1 braking valve is at the electric empty position When used as a small gate, it mainly has the following problems: [0003] (1) The structure is too complicated for the brake control of the main engine. Since the large and small gates do not require functional conversion during operation, the more complex the structure, the higher the failure rate. [0004] (2) Failure orientation is not safe. When the DK-1 brake valve is used as a small brake, when the handle is in the brake position, the spring pushes the action plunger to the brake position, and communicates the passage from the pr...

AI Technical Summary

Problems solved by technology

[0003] (1) The structure is too complicated for the brake control of the main engine

Since the large and small gates do not require functional conversion during operation, the more complex the structure, the higher the failure rate

[0004] (2) Failure-oriented is not safe

If the DK-1 brake valve is used for a long time, the return force of the spring decreases and the frictional resistance of the rubber ring increases, which will cause the plunger to fail to reach the braking position, the locomotive’s independent braking function will fail, and the fault guidance will be unsafe.

[0005] (3) The operating handle often gets stuck

The structure of the cam driving the plunger must have a strong enough spring force, which makes the cam easy to wear. Although various improvement measures have been taken, due to structural defects, the stuck fault cannot be completely avoided.

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