692 MODERN STEAM PRACTICE . side of the piston or diaphragm A through the branch pipe F , and from the vacuum chamber B and top side of piston or diaphragm through the valve D , so that a vacuum of 20 to 24 inches ( i . e . 10 to 12 lbs . per square inch ) is maintained throughout the System . To… … Fig . 538D . — The Vacuum Automatic Brake . allows air to flow to the bottom side of the piston or diaphragm , the top side and vacuum chamber maintaining the vacuum through the action of the valve D , which closes immediately air is admitted to the train pipe . To release the brakes when the…
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