Accelerator device for control valve of an air brake system for

Details Accelerator device for control valve of an air brake system for Accelerator device for control valve of an air brake system for

1977-11-11

1979-01-23

Barefoot, Galen L.

Fluid-pressure and analogous brake systems

Releasing

303 82, B60T 1502

Patent

active

041357680

ABSTRACT:
An accelerator device for a three-pressure control valve of an air brake system on a railway vehicle has a control piston one side of which is subjected to air line pressure and the other side to pressure in a control chamber such that when the pressure in the control chamber predominates the control piston opens an accelerator valve between the air line pressure and a valve chamber. A monitor valve is between the valve chamber and a transfer chamber which continuously communicates to the atmosphere through a throttle orifice. A first piston operates the monitor valve and is subjected in the closing direction of the monitor valve to the action of braking pressure against the effect of a spring force. A second piston which is coupled to the first piston is loaded by air-line-pressure acting in the closing direction of the monitor valve against the pressure in a chamber which can be filled with air line pressure through a check valve opening in the direction of flow of the air line pressure and having a throttle orifice therein.

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