Full-function valve for heavy duty semi-trailer brake system

Details Full-function valve for heavy duty semi-trailer brake system Full-function valve for heavy duty semi-trailer brake system

1993-11-09

1995-05-23

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 71, 303DIG2, B60T 1362

Patent

active

054174791

ABSTRACT:
A full function brake valve for a semi-trailer is contained within a single housing and provides ports for receiving supply air and control air, and for delivering and receiving air from reservoirs, service brakes and spring brakes, and delivering air to an exhaust. The internal valves include a pressure protection valve which communicates with a first check valve and a quick release valve to pressurize spring brake chambers, and a reservoir check valve and a relay valve to respectively pressurize a reservoir and to deliver supply air to service brakes. An orifice preferably provided in a second check valve permits partial air flow to the spring brakes to release the spring brakes for towing the vehicle.

REFERENCES:
patent: Re30205 (1980-02-01), Carton et al.
patent: 4042281 (1977-08-01), Ury
patent: 4080004 (1978-03-01), Ury
patent: 4163585 (1979-08-01), Ury
patent: 4182535 (1980-01-01), Fannin
patent: 4226482 (1980-10-01), Stable et al.
patent: 4472001 (1984-09-01), Fannin
patent: 4593954 (1986-06-01), Campanini
patent: 4915456 (1990-04-01), Gross et al.
patent: 5236250 (1993-08-01), Moody et al.
patent: 5322353 (1994-06-01), Wallestad

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