. Electric railway journal . emergency pipe,(3) the safety control pipe, (4) the straight air pipe and(5) the sand pipe. Of the above devices it is considered that, since theyare so well kno^vn, the compressor, safety valve, gov- flows into the door-opening pipe when doors are to beopened and into the door-closing pipe when doors areto be closed. The function of the emergency pipe hasbeen explained. The pipe is normally at reservoirpressure. Since the equipment is semi-automatic, airin a service application is admitted directly to the brakecylinder by the brake valve. The pipe by which this ai
. Electric railway journal . emergency pipe,(3) the safety control pipe, (4) the straight air pipe and(5) the sand pipe. Of the above devices it is considered that, since theyare so well kno^vn, the compressor, safety valve, gov- flows into the door-opening pipe when doors are to beopened and into the door-closing pipe when doors areto be closed. The function of the emergency pipe hasbeen explained. The pipe is normally at reservoirpressure. Since the equipment is semi-automatic, airin a service application is admitted directly to the brakecylinder by the brake valve. The pipe by which this airis conducted is the straight-air pipe. The function ofthe sanding pipe and of the brake-valve exhaust pipeis self-evident. Three conditions should be noted in considering thebrake valve. First, pressure to hold the doors closedis obtained from the emergency pipe rather than themain reservoir pipe, in order that the doors may bemade hand-operated in an emergency, the manner inwhich this is accomplished being described PIPING diagram of air BRAKE AND SAFETY CAR CONTROL EQUIPMENT—RELEASE POSITION, DOORS CLOSED ernor and brake cylinder require no description. Theother devices will be taken up in order. When referenceis made to the diagram it should be remembered thatthis is simply an illustrative drawing and does not showthe true construction of the parts. The brake valve has six positions: (1) Release, (2)lap, (3) service, (4). handle-off, (5) door-opening and(6) emergency. To the brake valve are connected sevenpipes (the numbers referring to raised figures cast onthe pipe bracket) : (1) door-opening, (2) emergency,(3) door-closing, (4) straight-air, (5) sanding, (6)brake-valve-exhaust and (7) main reservoir. To realizehow these pipes are connected in the various brake-valve positions it is first necessary to understand theirfunctions. A constant supply of air at the brake valveis required. This is provided by the main reservoirpipe, which makes permanent connection bet
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