Patent ID: 9616872
Date: 2017-04-11
CPC Classifications: B60T

Claim:
1. A service valve portion of a brake control valve, the service valve portion comprising: a body having a first side, a second side, a piston passageway defined therein extending from the top side to the bottom side, and a plurality of ports for connecting the service valve portion to at least one exhaust port, a brake pipe, at least one brake cylinder, a local reduction room, an accelerated release reservoir, and an auxiliary reservoir; and a main piston assembly movably disposed in the piston passageway of the service valve portion, the main piston assembly comprising: wherein the first side of the service graduating valve is configured to movably engage the graduating valve seat of the service slide valve to establish a variety of porting connections between the service graduating valve and the service slide valve based on the relative position of the service graduating valve and the service slide valve, wherein the service valve portion is controlled to perform brake valve functions based at least in part on the relative position of the service graduating valve and the service slide valve, wherein the porting pattern of the first side of the service graduating valve includes accelerated application valve exhaust ports and the porting pattern of the graduating valve seat of the service slide valve includes brake pipe to local reduction room ports that are configured to cooperate to allow the service valve portion to perform an accelerated application valve function, wherein the porting pattern of the first side of the service graduating valve includes an accelerated release reservoir to auxiliary reservoir bleeder port configured to direct compressed air to move the service graduating valve to discontinue the accelerated application valve function, and wherein the porting pattern of the graduating valve seat of the service slide valve includes an accelerated release reservoir port to the graduating valve seat configured to direct compressed air to the service graduating valve to discontinue the accelerated application valve function.