Vincent F. Troiani

Abstract: An electro-pneumatic brake system for a railroad freight car is integrated with the existing pneumatic freight brake system by utilizing the air stored in the emergency reservoir to supply brake cylinder pressure via the exhaust passage of the pneumatic control valve, which is maintained in release position during electro-pneumatic brake operation. The electro-pneumatic brake system fails to a release mode, so that the brakes on an individual car that experiences a power loss do not apply. In the case of a power loss in the electro-pneumatic system, due to a train break-in-two, the pneumatic brake system is automatically operated by the consequent loss of brake pipe pressure to provide a back-up brake, while at the same time interrupting the control valve exhaust path via which the electro-pneumatic brake is communicated with the brake cylinder.

TL;DR: A dual valve fitting enables quick measurement of pressure contained within a housing as mentioned in this paper, which includes a valve body, a valve retainer, first and second sealing rings and a biasing mechanism.

TL;DR: A portable, microprocessor controlled single-car test unit for a railway freight brake control valve for automatically executing pressure manipulations to evaluate the operating conditions of the control valve is described in this article.

TL;DR: In this paper, a combined automatic pneumatic and electro-pneumatic brake system for a railroad freight car is presented, in which a conventional type ABD control valve device is modified to incorporate a solenoid valve portion at a mounting face from which the manual release valve portion has been removed and where existing passages in the control valve may be accessed in order to utilize the existing car control valve with only a minimum of modification.

TL;DR: In this paper, an improved freight brake emergency valve device has been proposed, having improved stability against undesired emergency brake applications, without loss of emergency sensitivity, using a flow regulator in the form of a valve and choke combination or a choke itself.