Pneumatic control device and method for stage relief of brake pressure in brake system of freight train
A technology of pneumatic control valve, brake cylinder pressure, applied in the direction of brake safety system, brake, brake components, etc., can solve problems such as increasing cost factors
Inactive Publication Date: 2007-07-11
WESTINGHOUSE AIR BRAKE TECH CORP
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Problems solved by technology
However, the pneumatic control valve control system has two disadvantages: It takes a while for the change in pressure to propagate from the locomotive to all cars—perhaps hundreds of cars
[0005] Another downside is that once the brakes are applied, the only way to relieve the braking force is to vent the brake cylinders to atmosphere so that the pressure is completely relieved from the brake cylinders
These requirements significantly increase the cost factor
Method used
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Embodiment Construction
[0035] To assist in understanding the preferred embodiment of the present invention, it will be helpful first to describe the prior art freight train brake control system shown in Figures 1 and 2 of the accompanying drawings.
[0036] A conventional pneumatically operated brake control system for freight trains is shown in accompanying drawing 1, wherein a pneumatic control valve 10 (PCV) of the type ABDX, ABDW or DB-60 is connected with a brake pipe 13 (BP), auxiliary reservoir The air tank (AUX) 15 is connected to the emergency gas storage tank (EMER) 17 . Each tank is normally charged with pressurized fluid supplied by BP 13 through auxiliary section 11 and emergency section 12 in the PCV. The PCV 10 is also connected to a fluid pressure activated brake cylinder arrangement (BC) 19 which causes brake shoe to wheel friction to control vehicle speed. PCV 10 also has a vent section 21 for connecting BC 19 to atmosphere. Alternatively, the PCV 10 can be connected to a retaine...
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A release graduating valve for freight brake control is provided for a railcar having a pneumatic control valve, emergency and auxiliary reservoirs each normally charged with pressurized fluid from a brake pipe and a fluid pressure activated brake cylinder device for applying the brakes on the railcar. A selectively operable release graduating valve can include a graduated release valve and a changeover valve which selectively interposes the graduated release valve to exhaust brake cylinder pressure in a graduated manner responsive to brake pipe pressure. Alternatively, the changeover valve can isolate the graduated release valve and direct the pneumatic control valve to exhaust brake cylinder pressure in a conventional manner. The changeover valve can be operated responsive to the pressure in an air pipe supplied with pressurized fluid from a remote source. A permanent release graduating valve can be provided wherein the changeover valve is omitted, in which case the brake cylinder exhaust is always controlled by the graduated release valve. Either configuration of the release graduating valve could be also be utilized in an ECP freight brake control system.
Description
[0001] This application is based on Provisional Patent Application Serial No. 60 / 214,511 filed June 28,2000. technical field [0002] The present application generally relates to a freight train braking control system, and in particular to a pneumatic control device and method for gradationally relieving brake cylinder pressure in the freight train braking control system. Background technique [0003] The traditional freight train braking system is controlled by a pneumatic control valve, and the braking efficiency of each car of the train is controlled by the pressure fluid. One or more locomotives and each car are interconnected by a brake pipe that supplies pressurized fluid from the main air tank on the locomotive to the air tank in each car. In a standard pneumatic freight braking system, there is an on-board air storage tank on each car. The typical air storage tank is divided into two parts: an emergency braking unit and an auxiliary braking unit. They pass through th...
Claims
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IPC IPC(8): B61H11/10B60T15/18B60T15/36B60T15/54B60T17/04B60T17/22
CPCB60T17/228B60T17/04
Inventor J·E·哈特T·恩格尔
Owner WESTINGHOUSE AIR BRAKE TECH CORP