Abstract: A continuous quick service device is proposed for use in conjunction with a direct release brake controlling triple valve and which, while not interfering with the emergency valve operation, operates by employing quick action chamber air both as a reference against which brake pipe pressure reductions are detected and as a source of air to operate a pressure responsive device in a reciprocating manner to discharge pulses of air from a reducing brake pipe to afford quick service operation of the triple valve both for initial application from a brakes released condition and for subsequent brake pipe pressure reductions giving rise to increased brake applications. A relay valve serves to operate the pressure responsive device to provide additional sensitivity.

Abstract: An accelerated release valve is proposed for brake control valves, especially direct release triple valves, the accelerated release being triggered by rapid collapse or discharge of quick service volume pressure at commencement of a brake releasing mode.

Abstract: A bracking system for tractor-trailer combinations wherein the air delivery time to the trailer brakes is substantially reduced. A boost-air assembly having its own air supply is mounted at the forward end of the air delivery system. The assembly includes a fast-acting amplifying relay valve, a closely-coupled air tank and a bracket for mounting the valve and the tank. In the prime embodiment, the assembly is mounted on the tractor proximate the rear thereof to significantly reduce the time required to transmit a control pressure to the trailer brake actuators because (1) less time is required for the control pressure to reach the amplifying valve, (2) the fast response time of the valve, (3) the amplification achieved by the valve and (4) the proximity of the closely-coupled auxiliary air tank. Alternate mounting loctions are also taught for mounting one or more boost-air assemblies for even further lessening air delivery time to the trailer brakes.

Abstract: A pneumatic braking system for tractor-trailer combinations in which the actuation and release of the trailer brakes occur more nearly in coincidence with the actuation and release of the tractor brakes; the system includes a fast acting amplifying valve operable in response to a control pressure indicative of the magnitude of braking desired to provide an amplified control pressure and a separate air supply located proximate to the amplifying valve for providing the air supply for the amplified control pressure.

Abstract: An electrically actuated relay valve or adaptive braking modulator for a vehicle fluid pressure braking system includes a housing having a fluid pressure inlet, a pair of vents communicating with the ambient atmosphere, and a brake application effecting mechanism. The inlet communicates with a chamber defined within the modulator, amd this chamber is in turn communicated to the brake application effecting mechanism. An electrically actuated valve controls communication from the inlet into the chamber, and is shiftable from a first condition permitting substantially uninhibited communication from the inlet to the chamber to a second condition communicating the chamber to one of the vents when an incipient skidding condition is detected. A pressure differential responsive valve element controls communication between the chamber, the brake application effecting mechanism, and the other vent.

Abstract: A fluid brake control system is provided including a brake control pipe and a control valve comprising a quick action chamber and an emergency slide valve operable from a normal to a service brake position in response to service reduction in brake pipe pressure, the emergency slide valve having a fluid pressure differential operated abutment disposed between a first pressure chamber within a housing on one side of the abutment subject to pressure of the quick action chamber, and a second pressure chamber contained in a housing cover on the other side of the abutment connected by a passage to the brake pipe. The cover includes quick action control apparatus including a quick action poppet type valve operably connected to the abutment for actuation of the quick action valve by the abutment from a normally closed to an open position in response to the operation of the abutment in one direction to a service braking position. The quick action poppet type valve vents fluid from the brake pipe when it is opened.

Abstract: A two-pressure brake control valve has a service brake portion which is connected to a brake line, an auxiliary reservoir,an emergency reservoir and a brake cylinder. A main piston in the service brake portion is subjected to brake line pressure on one side and on its other side is subjected to pressure in the auxiliary reservoir. An auxiliary piston which has a greater sensitivity of response than the main piston is displaceable on the main piston and has one side subjected to the brake line pressure and its other side subjected to auxiliary reservoir pressure. A release acceleration valve is connected to the brake line and has an actuator in the displacement path of the auxiliary piston so as to be actuated to an open position upon movement of the auxiliary piston in the initial phase of a brake release operation. There is also a filling valve which is actuated in response to movement of the auxiliary piston to connect the emergency reservoir to the auxiliary reservoir during the release operation.

Abstract: A pneumatic vehicle spring parking brake pressure holding valve abruptly seals an atmospheric outlet and enables the valving of brake release air pressure to the spring parking brakes when the vehicle reservoir attains a first pressure. Parking brake release is thus enabled. In the case of loss of air pressure from the system, the pressure holding valve retains the brakes fully released until the vehicle reservoir air pressure drops to a second pressure which is lower than the first. The pressure holding valve thereupon abruptly opens its atmospheric outlet thereby rapidly exhausting the air pressure in the spring parking brakes and setting them.

Abstract: A fluid pressure brake system includes electrically actuated application and release valves. Upon brake application, brake control pipe pressure is vented electrically to accelerate application. Upon brake release, supply reservoir pressure is admitted electrically to the brake control pipe to accelerate release. In emergency situations, auxiliary equipment may be operated from the main reservoir pipe, the supply reservoir or the brake pipe, as desired. A novel solenoid-actuated valve is disclosed, which cooperates with unique indicator circuitry to provide a positive, continuous indication of a preceding electrically assisted application or release.

Abstract: A fluid operable brake control valve apparatus is provided which includes a brake cylinder valve for controlling the supply of fluid pressure into and out of a brake cylinder. The valve is operable by a main pressure responsive member moveable in response to changes in pressure when applied to a brake pipe. A quick service valve is operable in response to such a change tending to cause a brake application for connecting a quick service volume to the brake pipe to enhance the change at commencement of an application. An accelerated release valve device is operable in response to release of fluid pressure from the quick service volume to connect a charged accelerated release reservoir to the brake pipe to assist a change of pressure in the brake pipe causing such a release.

Abstract: An upgraded railway freight car brake control valve device comprises a novel emergency valve portion that embodies therein a plurality of simple and inexpensive poppet valves that replace yet perform the same functions heretofore performed by more expensive slide type valves which slide valves, and the flat seats upon which they slide as they are shifted from one position to another, in their manufacture require a considerable amount of accurate machining thus increasing the cost of the valve device of which they are an important part.

Abstract: A brake control valve device operated by a reduction in brake pipe pressure on one side of a movable abutment relative to control reservoir pressure on the opposite side embodies in the abutment a control reservoir charging valve mechanism, a filter and a choke arranged in series. The valve mechanism comprises a spring-biased valve slidably mounted in a ported bushing carried by the abutment. Two spaced-apart stops carried on the abutment enable relative movement between the abutment and the valve whereby, in one position of the valve, fluid under pressure may flow from the brake pipe to the control reservoir to effect charging thereof via the ported bushing, a passageway in the valve and the choke, and, in a second position of this valve, this charging communication is closed.

Abstract: An improved simplified emergency brake valve device including a relay valve portion responsive to brake pipe pressure reduction at an emergency rate for actuating a logic valve portion which, in turn, when actuated, causes operation of a vent valve portion via which the brake pipe is opened to atmosphere for effecting reduction of brake pipe pressure at an emergency rate at the succeeding car in the train, thereby propogating such reduction of brake pipe pressure throughout the train for effecting an emergency brake application thereon.

Abstract: A fluid brake control system is disclosed for having an improved brake cylinder release control device for use in association with a brake control pipe, a fluid reservoir, and a service valve. The control device has a housing containing a differential abutment subject to actuation from a normal position by differences in pressure between a release spring in a chamber on one side of the abutment and pressure selectively applied to the abutment in another chamber on the opposite side of the abutment. A plurality of poppet type valves operated by longitudinal push rods connected by a bridge are provided in the chamber on each side of the abutment, the bridge being actuated at a midpoint by the abutment.

Abstract: A fluid brake control system is disclosed having a brake application and release control device for governing fluid pressure in a brake cylinder. The control device comprises a housing containing a differential abutment subject to actuation from a normal position by differences in pressure between respective brake pipe and reference fluid pressure chambers on opposite sides of the abutment. At least one poppet type valve is provided in the housing on each side of the abutment, that is spring biased in the direction of the abutment to a closed position, having an operating push rod axially disposed between the associated poppet valve and the abutment.

Abstract: A fluid brake control system is disclosed having an improved quick service and accelerated release control device having valves operable when rendered effective to locally reduce the brake pipe pressure to accelerate a brake application signal through a train and at other times to apply fluid to the brake pipe for accelerating the release of brakes of a train. The control device comprises a housing containing a fluid pressure differential operated abutment subject to actuation from a normal position by differences in pressure between respective brake pipe and reference fluid pressure chambers on opposite sides of the abutment. Two quick service valves of the ball poppet type are provided on one side of the abutment that are spring biased in the direction of the abutment against their valve seats to normally closed positions and have operating push rods longitudinally disposed between the associated ball poppet valves and one side of the abutment.