GB141767A - Improvements relating to fluid pressure braking apparatus - Google Patents

Abstract

141,767. Rendell, A. W. Nov. 21, 1918. Fluid-pressure.-Valve mechanism adapted to effect the exhaust of the brake cylinder in releasing the brakes, by an amount dependent upon the increase in train-pipe pressure, comprises a pair of abutments subject respectively to the train-pipe and brake-cylinder pressures and to a spring resistance, and connected by a floating lever or equivalent which actuates a valve controlling the brake cylinder exhaust passage of the triple valve. In the form described, the triple-valve exhaust passage is connected at 5 and the train-pipe at 12. The abutments 11, 16 are connected by a floating lever 8 to which is connected at 7 the valve 1 controlling an exhaust port 2. Under running conditions, the train-pipe pressuro and the spring 17 respectively hold the abutments 11 16, in the extreme positions show and the brake cylinder is open to exhaust through the triple valve and the port 2. When the trainpipe pressure is reduced in applying the brakes, the abutment moves to the left and closes the port 2. Upon the increase of train-pipe pressure after an application, the abutment 11 is moved towards the right hand, and the triple valve connects the brake cylinder to the chamber 16<1> of the abutment 16, which also moves to the right, and the valve 1 is thus opened. When the brake. cylinder pressure has fallen by the necessary amount, the spring 17 moves the abutment 16 towards the left hand and closes the valve 1.