GB218994A - Improvements relating to fluid pressure braking apparatus - Google Patents
Improvements relating to fluid pressure braking apparatusInfo
- Publication number
- GB218994A GB218994A GB15413/24A GB1541324A GB218994A GB 218994 A GB218994 A GB 218994A GB 15413/24 A GB15413/24 A GB 15413/24A GB 1541324 A GB1541324 A GB 1541324A GB 218994 A GB218994 A GB 218994A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- pressure
- pipe
- brakes
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/36—Other control devices or valves characterised by definite functions
- B60T15/54—Other control devices or valves characterised by definite functions for controlling exhaust from triple valve or from brake cylinder
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
218,994. Duchatel, E. E. H. July 9, 1923, [Convention date]. Fluid - pressure. - A graduated release valve operating in conjunction with the triple valve or other distributing valve of fluid-pressure brakes is so arranged that gradual variations in the train pipe, pressure produce a graduated release of the brakes, whilst sudden pressure variations result in full release. The valve comprises a pair of pistons P<1>, P<2> connected respectively to a valve t subject to the pressure of a spring r<1> and to a slide valve i subject to the pressure of a spring r<3> and having a projection q engaging with the curved portion of a spring r<2>, stops u being provided to limit the upward movement of the piston P<2>. The chambers b, a, e communicate respectively with the exhaust part of the triple valve, the train pipe, and the auxiliary reservoir, whilst a pipe g connects the chamber b with a cavity in the slide valve l, and a passage f leads to exhaust. When train pipe pressure is reduced to apply the brakes, the pressures in the chamber b, e keep the ports in the position shown and the movement of the triple valve isolates the chamber b from the brake cylinder, but when fluid is again supplied to the train pipe to release the brakes, the chamber b communicates with the brake cylinder through the pipe c and the exhaust port of the triple valve. If the supply is gradual, the train pipe and auxiliary reservoir pressures remain substantially equal and the piston P<2> will remain in position, and the pipe g will be cut off from the exhaust f by the slide valve l. The valve t will, however, open to vent the brake cylinder as soon as the resistance of the spring r<1> is overcome by the combined upward pressures in the chambers a, b, and will remain open until these forces equalize, thus effecting a partial release of the brakes. If, however, the train pipe is rapidly charged, so that train pipe pressure increases more rapidly than auxiliary reservoir pressure, the piston P<2> will be moved downwards and the slide valve l will connect the pipe g to the exhaust f to effect complete release of the brakes. The piston will remain in its lower position until train pipe pressure is again reduced, when excess pressure in the chamber e, assisted by the spring r<3>, will move it back to normal position. A cock may be provided in the pipe c to cut out the graduated release valve, and the latter may comprise an upper and a lower valve each containing a chamber a, the cavity in the slide valve l then being connected directly to the pipe c. The lower valve may also be used alone in conjunction with the brake cylinder, or it may be interposed between the triple valve and the brake cylinder. In the latter case, the slide valve l would control ports leading respectively to the triple valve, the brake cylinder, and the atmosphere.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR417854X | 1923-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB218994A true GB218994A (en) | 1925-02-19 |
Family
ID=8898240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15413/24A Expired GB218994A (en) | 1923-07-09 | 1924-06-26 | Improvements relating to fluid pressure braking apparatus |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE417854C (en) |
FR (1) | FR570435A (en) |
GB (1) | GB218994A (en) |
-
1923
- 1923-07-09 FR FR570435D patent/FR570435A/en not_active Expired
-
1924
- 1924-06-26 GB GB15413/24A patent/GB218994A/en not_active Expired
- 1924-07-05 DE DED45768D patent/DE417854C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR570435A (en) | 1924-04-30 |
DE417854C (en) | 1925-08-20 |
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