Pressure control flow amplification valve

Abstract

The invention discloses a pressure control flow amplification valve arranged in an air brake system. Output pressure is adjusted according to changes of control pressure. The pressure control flow amplification valve comprises a valve body with a plurality of air path channels, a valve rod capable of vertically moving, a piston component, a throttling valve capable of adjusting flow, an air filter device, a valve seat, an elastic element, a necessary sealing formwork and a spring, wherein the air filter device and the valve seat are arranged in the valve body. The valve rod, the piston component and the elastic element divide a movable cavity in the valve body into a plurality of independent changeable volume spaces. A brake pressure cavity is connected with a feedback pressure cavity through the throttling valve. Different large-flow pressures can be output by the flow amplification valve by adjusting pilot pressure of pre-control cavities. Under different feedback cavity pressure volumes and different using pressure conditions, the stable output performance can be obtained by adjusting the flow of the throttling valve connected between the brake pressure cavity and the feedback pressure cavity.

Description

technical field [0001] The invention relates to the field of rail transportation, in particular to a pressure-controlled flow amplifying valve. Background technique [0002] The traditional mechanical pressure control valve for rail transit relies on its own pressure regulation, and controls the inflation and exhaust of the train tube through the change of the load air pressure, that is, the decompression brake of the train tube. [0003] The current braking system of rail transit vehicles generally adopts micro-electromechanical air braking system, which requires fast and accurate control of the pressure of the brake cylinder and a large flow of pressure air output. As a key component in the controlled application of brake pressure, such mechanical valves also require high reliability of the control function. The traditional decompression braking method uses a pressure regulating valve to output a large flow, but it cannot accurately control the output of the braking press...

AI Technical Summary

Problems solved by technology

The traditional decompression braking method uses a pressure regulating valve to output a large flow, but it cannot accurately control the output of the braking pressure, and it is difficult to meet the requirements of the microcomputer-controlled braking system.

And large particles of impurities in the air will enter the valve, affecting the reliability of the valve

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