Title: Control system of a railway vehicle air braking system

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Abstract: A condition-responsive or safety switch regulates the energizing of a first relay having two contacts that are open when non-energized. The first contact is connected to a contact switch of a differential pressure switch and regulates an energizing circuit for a second relay through a holding contact of the second relay. The second contact of the first relay is in series with a pressure switch and connected into an energizing circuit for the second relay in such a manner that a contact of the second relay when open in the deenergized state regulates a control circuit for a brake solenoid valve. The brake solenoid valve is in a connection betwen the control input and control output of an operator's brake valve. Pressure regulating apparatus is connected to the control output and apparatus for controlling pressure in the air line is connected to the control input. The solenoid valve when in the deenergized condition interrupts the connection between the control input and control output and establishes a throttled connection between the control input and the atmosphere. This causes a first air tank to be connectedto the control input through a first throttle check valve opening in such direction of flow in such a manner that the pressure in the first air tank acts upon the differential pressure switch in its closing direction against the pressure in the operator's brake valve control input. A second air tank is connected to a second throttle check valve opening in such direction of flow to a control connection of the operator's brake valve which is vented to the atmosphere only in a position of the operator's brake valve that corresponds to full braking. Otherwise, compressed air is passed. The pressure in the second air tank acts upon the pressure switch in the opening direction thereof.


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