Variable load valve device

Details Variable load valve device Variable load valve device

1980-02-25

1981-11-24

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

303 40, B60T 818

Patent

active

043020585

ABSTRACT:
A vehicle load responsive control valve device in which the output pressure regulating valve assembly is controlled by multiple diaphragm pistons, which are arranged separately in tandem relationship and are operative responsive to the fluid pressure of different air springs of the vehicle. Being of equal pressure areas, these diaphragm pistons are effective to exert a control force on the valve assembly according to the higher of the respective air spring pressures to ensure against low brake forces when the pressure of one of the air springs is inadvertently lost under loaded car conditions. Under empty car conditions, a bias spring is effective to obtain a predetermined output pressure.

REFERENCES:
patent: 2950147 (1960-08-01), Neubeck
patent: 3730597 (1973-05-01), Pickert
patent: 4077676 (1978-03-01), Hata

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