Working principle of air brake

Air Braking When the driver moves the brake valve to the push position, part of the compressed air in the main brake pipe is discharged to the atmosphere. At this time, the air pressure in the auxiliary air cylinder is relatively greater than the air pressure in the main brake pipe, thus pushing the main piston of the three-way valve to move to the left, cutting off the passage of the inflation ditch, and preventing the compressed air in the auxiliary air cylinder from flowing back. When the main piston of the three-way valve moves, it drives the slide valve to move to the left to cut off the outlet to the atmosphere, so that the compressed air in the auxiliary air cylinder enters the brake cylinder and pushes the brake cylinder to move to the right. Through the transmission of the brake lever, the brake shoe holds the wheel tightly for braking.