GB739475A - Improvements relating to fluid pressure braking apparatus for railway and like vehicles - Google Patents

Improvements relating to fluid pressure braking apparatus for railway and like vehicles

Info

Publication number
GB739475A
GB739475A GB7588/54A GB758854A GB739475A GB 739475 A GB739475 A GB 739475A GB 7588/54 A GB7588/54 A GB 7588/54A GB 758854 A GB758854 A GB 758854A GB 739475 A GB739475 A GB 739475A
Authority
GB
United Kingdom
Prior art keywords
pressure
brake
diaphragms
brake cylinder
space
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
Application number
GB7588/54A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Mobility Ltd
Original Assignee
Westinghouse Brake and Signal Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Brake and Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Publication of GB739475A publication Critical patent/GB739475A/en
Expired legal-status Critical Current

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
    • B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
    • B60T15/184—Railway control or brake valves

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

739,475. Fluid-pressure brakes. WESTING- HOUSE BRAKE & SIGNAL CO., Ltd. March 16, 1954 [March 17, 1953], No. 7588/54. Class 103 (1). A known type of triple or distributer valve for fluid pressure railway brakes comprising diaphragms s and S which deflect in accordance with brake pipe pressure to supply or exhaust the brake cylinder is modified by the addition of further diaphragms s<SP>1</SP> and S<SP>1</SP> which give to the valve assembly a variation of brake cylinder pressure with pressure drop in the brake pipe of the kind shown in Fig. 4 as compared with that for the unmodified valve as shown in Fig. 2, which is undesirably steep for operation of the brakes at low cylinder pressures. The space between the two diaphragms S<SP>1</SP> and s<SP>1</SP> is open to atmosphere by port A<SP>1</SP>, the space above the diaphragm s<SP>1</SP> is connected to the control reservoir, and the space under the diaphragm S<SP>1</SP> to the brake cylinder. The normal diaphragms S and s give the valve assembly a characteristic curve as shown by the part 9a. The diaphragms s<SP>1</SP> and S<SP>1</SP> do not have any effect until the brake cylinder pressure is sufficient to overcome the effect of control reservoir pressure acting above s<SP>1</SP>, whereupon they deflect upwardly to engage the main assembly and the brake cylinder against brake pipe pressure variation curve assumes the slope of the part 9b. As shown in Figs. 5 and 6 the valve assembly is modified to vary the braking characteristics according to whether the vehicle is empty or loaded. When the vehicle is loaded the cock 5 is set in the position shown in Fig. 6, in which the space below the diaphragm S<SP>1</SP> is connected to atmosphere through port A<SP>2</SP> and the brake cylinder is connected to the space above a piston 2 which is moved to cut off the auxiliary reservoir RA at a predetermined brake pressure to prevent over-braking of empty or lightly loaded vehicles.
GB7588/54A 1953-03-17 1954-03-16 Improvements relating to fluid pressure braking apparatus for railway and like vehicles Expired GB739475A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR739475X 1953-03-17

Publications (1)

Publication Number Publication Date
GB739475A true GB739475A (en) 1955-10-26

Family

ID=9132751

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7588/54A Expired GB739475A (en) 1953-03-17 1954-03-16 Improvements relating to fluid pressure braking apparatus for railway and like vehicles

Country Status (1)

Country Link
GB (1) GB739475A (en)

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