Combined load-sensing proportion and relay valve

Details Combined load-sensing proportion and relay valve Combined load-sensing proportion and relay valve

1974-10-21

1976-03-23

Reger, Duane A.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

303 40, B60T 818

Patent

active

039456897

ABSTRACT:
The valve includes a main valve member having an axial exhaust passage and held in the normally closed state, and a control piston assembly for opening the valve member depending on the payload of the vehicle on which the air brake is installed. The control piston assembly comprises a control piston having a valve seat on its underside cooperable with the main valve member, a stepped piston composed of two portions with different diameters and located substantially coaxially with, and in spaced relation to, the control piston in a passage leading from an indicated-pressure inlet to the upper surface of the control piston, a valve assembly adapted to be opened and closed by the axial movement of the stepped piston to control the indicated pressure applicable to the upper surface of the control piston and to the stepped piston, and a loading spring engaging the upper end of the stepped piston, with its compressive load adjustable according to the payload of the vehicle.

REFERENCES:
patent: 3285674 (1966-11-01), Eaton
patent: 3376080 (1968-04-01), Kettering et al.
patent: 3837713 (1974-09-01), Masuda et al.

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