Relay valve combined with a load-sensing proportion valve

Details Relay valve combined with a load-sensing proportion valve Relay valve combined with a load-sensing proportion valve

1974-05-10

1976-02-03

Blix, Trygve M.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

303 6C, 303 40, B60T 818

Patent

active

039360970

ABSTRACT:
A combined load-sensing proportion and relay valve for an air brake system including a valve disk which has an exhaust passage in its axial center and is adapted to hold the valve in normally closed position, and a control piston unit which is actuated by an indicated pressure from a brake valve to move the valve disk and open the valve. The control piston unit includes a first pressure-sensing piston for controlling the valve-opening action of the valve disk and a second pressure-sensing piston coaxially connected to the first piston via a spring therebetween. A stroke adjusting device is provided to control the axial movement of the second piston correspondingly to the payload of the vehicle.

REFERENCES:
patent: 3188149 (1965-06-01), Pekrul
patent: 3228731 (1966-01-01), Valentine
patent: 3302982 (1967-02-01), Pekrul
patent: 3404922 (1968-10-01), Valentine
patent: 3413042 (1968-11-01), Herold
patent: 3606485 (1971-09-01), Scott
patent: 3645585 (1972-02-01), Deem et al.

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