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

1975-10-10

1977-08-30

Blix, Trygve M.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

303 40, B60T 822

Patent

active

040450945

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: 1156952 (1915-10-01), Ward
patent: 2553805 (1951-05-01), Bent
patent: 3188149 (1965-06-01), Pekrul
patent: 3302982 (1967-02-01), Pekrul
patent: 3484138 (1969-12-01), Cumming
patent: 3512845 (1970-05-01), Farmery et al.
patent: 3586389 (1971-06-01), Page et al.
patent: 3612621 (1971-10-01), Scott

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