Combined load-sensing proportion and relay valve for an air brak

Details Combined load-sensing proportion and relay valve for an air brak Combined load-sensing proportion and relay valve for an air brak

1974-05-10

1976-03-16

Schwadron, Martin P.

Fluid-pressure and analogous brake systems

Automatic

Application valve

303 22R, 137 85, 13759618, 1376275, F16K 3112, F15B 13042

Patent

active

039442942

ABSTRACT:
A combined load-sensing proportion and relay valve for an air brake system, comprising a valve disk having an exhaust hole in the axial center, and a control piston assembly for adjustably moving the valve disk to open the valve, characterized in that the control piston assembly consists of two pressure-sensitive pistons, the first of the pistons being formed with a downward projection having a valve seat at its lower end for face-to-face engagement with the valve seat, an indicated-pressure chamber communicated with an indicated-pressure inlet port is formed between the upper side of the first pressure-sensitive piston and the underside of the second piston, a control-pressure chamber communicated with a control-pressure inlet port is provided above the second pressure-sensitive piston, and engaging means is located between the first and second pistons.

REFERENCES:
patent: 3252471 (1966-05-01), Olson
patent: 3712340 (1973-01-01), Deem
patent: 3788350 (1974-01-01), West

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