Presented By :-
Sumit Khune

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Vacuum brake
Overview of Vacuum brake
History-
The vacuum brake is a braking system employed on trains and introduced in the mid-1860s. . A variant, the automatic vacuum brake system, became almost universal in British train equipment and in those countries influenced by British practice.
Overview of Vacuum brake
 It was an alternative to the air brake, known as the vacuum brake. Like the air brake, the vacuum brake system is controlled through a brake pipe connecting a brake valve in the driver's cab with braking equipment on every vehicle.
Parts of the Vacuum Brake System
 This diagram shows the principal parts of the vacuum brake system
 Driver's Brake Valve- The means by which the driver controls the brake.
 Exhauster- A two-speed rotary machine fitted to a train to evacuate the atmospheric pressure
 Brake Pipe- The vacuum-carrying pipe running the length of the train
 Dummy Coupling- At the ends of each vehicle
 Coupled Hoses- The brake pipe is carried between adjacent vehicles through flexible hoses
 Brake Cylinder - The movement of the piston contained inside the cylinder operates the brakes through links called "rigging“
 Vacuum Reservoir -difference in pressure between one side of the brake cylinder piston and the other.
 Brake Block - made of cast iron or some composition material
 Brake Rigging - the movement of the brake cylinder piston transmits pressure to the brake blocks on each wheel
 Ball Valve -needed to ensure that the vacuum in the vacuum reservoir is maintained at the required level
How the automatic vacuum brake works
 Vacuum brake cylinder in running position: the vacuum is the same above and below the piston
How the automatic vacuum brake works
 Air at atmospheric pressure from the train pipe is admitted below the piston, which is forced up
Present-day use of vacuum brakes
 Today's largest operators of trains equipped with vacuum brakes are the Railways of India and Spoornet (South Africa), however there are also trains with air brakes and dual brakes in use.

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