Valve for controlling pressure medium actuated brakes for railwa

Details Valve for controlling pressure medium actuated brakes for railwa Valve for controlling pressure medium actuated brakes for railwa

1974-11-07

1976-04-06

Blix, Trygve M.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

303 15, B60T 818, B60T 1504

Patent

active

039485714

ABSTRACT:
A valve device for controlling pressure medium actuated brakes, particularly for railway vehicles, comprises a multi-stage valve to set one of a plurality of pressure stages. The valve has an axially displaceable stepped piston having a plurality of annular radial surfaces with a predetermined surface area ratio to each other. The surfaces are subjected to the action of pressure medium through control valves separately or in combination in accordance with a selected pressure stage. The piston controls a double valve connected between a source of pressure medium and the brake which is supplied with pressure medium or vented in response to position of the double valve. The radial surfaces of the piston are subjected to a selected stage pressure against a constant force that is independent of the control pressure such that this axially applied force is in balance with the force exerted by the pressure of the pressure medium against the radial surfaces at every braking stage.

REFERENCES:
patent: 3068050 (1962-12-01), Pekrul
patent: 3228731 (1966-01-01), Valentine
patent: 3517971 (1970-06-01), Scott
patent: 3685868 (1972-08-01), Nagase et al.
patent: 3761142 (1973-09-01), Williams et al.
patent: 3799623 (1974-03-01), Wickham et al.
patent: 3823984 (1974-07-01), Parfitt et al.

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