. Air brake text for engineers and firemen; . ALVE OR ONE CYLINDER V/ITH CRIvrR CDA-CE PLATE 56. each end. The piston valve is shorter than the distance betweenits two seats, and the bushing in which it works has two seriesof ports, c and c. When the piston is against seat b, as shownon Plate 56, port c opens a free passage for the air between the-straight air brake valve and the brake cylinder. The openingleading to the triple valve, which is now in release position, isclosed so that no leakage can occur. AUTOMATIC & STRAIGHT AIR EQUIPMENT. 129 Release Position. When the straight air brake va
. Air brake text for engineers and firemen; . ALVE OR ONE CYLINDER V/ITH CRIvrR CDA-CE PLATE 56. each end. The piston valve is shorter than the distance betweenits two seats, and the bushing in which it works has two seriesof ports, c and c. When the piston is against seat b, as shownon Plate 56, port c opens a free passage for the air between the-straight air brake valve and the brake cylinder. The openingleading to the triple valve, which is now in release position, isclosed so that no leakage can occur. AUTOMATIC & STRAIGHT AIR EQUIPMENT. 129 Release Position. When the straight air brake valve is inrelease position (its normal position when not in use), and anautomatic application is made, the air from the triple valve uponentering the double check valve will fojce the piston valve to theright against seat d (Plate 57), thus preventing any escape ofpressure at the straight air brake valve, and opening ports c sothat air can flow into the brake cylinder, returning the same waywhen released. TO bn-KE CYLINDEW FROMTRIPLEVALVE. SAFETY VALVE OR ONE CYLINDER,V^ITH DRIVER BRAKE PLATE 57. Position of Double Check Valve. The double check valvemust be placed in a horizontal position so that its piston valve willnot be moved except by air pressure. The use of either auto-matic or straight air will cause its piston valve to move auto-matically to the proper position. Grade Bleed Cocks. As grade bleed cocks are connectedbetween the driver and tender triple valves and their doublecheck valves, when left open they will prevent automatic actionon these brakes by allowing the air to pass directly to the atmos-phere instead of through the double check valves. I30 AUTOMATIC & STRAIGHT AIR EQUIPMENT. TYPE * E SAFETY VALVE. Operation. Plate 58 shows the type E safety valve. Valve4 is held to its seat by the compression of the spring betweenstem 5 and adjusting nut 7. When the pressure below valve 4is in excess of the tension of the spring, the valve raises, beingguided in its movemen
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