. Air brake text for engineers and firemen; . 126. Triple Head or Cap. RingQT3). QT 130. Middle Section ofFlange and Seatfor Vent Valve QT 131. 1 Small port F is drilled through the piston stem for the purposeof supplying air from the brake pipe to chamber G between QT166S and QT 164S; passage K in the triple valve body is forthe purpose of allowing air from the auxiliary reservoir to passto emergency valve QT 138; L, L is a passage in the body of thetriple valve between valves QT 138 and QT 117; QT 125 is thelower portion of the triple valve body known as the drainage,and provides for the bra
. Air brake text for engineers and firemen; . 126. Triple Head or Cap. RingQT3). QT 130. Middle Section ofFlange and Seatfor Vent Valve QT 131. 1 Small port F is drilled through the piston stem for the purposeof supplying air from the brake pipe to chamber G between QT166S and QT 164S; passage K in the triple valve body is forthe purpose of allowing air from the auxiliary reservoir to passto emergency valve QT 138; L, L is a passage in the body of thetriple valve between valves QT 138 and QT 117; QT 125 is thelower portion of the triple valve body known as the drainage,and provides for the brake pipe connection at W. NEW YORK QUICK ACTION TRIPLE VALVES. 2^7 Graduating Valve and Ports. This style of valve used on12, 14 and 16-inch brake cylinders is larger than the ordinaryquick action triple valve; it has a large graduating port for theair to pass through to the brake cylinder; it also has a larger ex-haust port and exhaust valve QT 162S, and has the graduatingvalve QT 163 mounted on top of exhaust valve QT 162S (Plate135). o IIJ. To Train PipelPipe QT 28QT30QT 31QT29 ^ PLATE 135. Friction. The friction of the operative parts is reduced byplacing graduating valve QT 163 on top of exhaust valve QT162S. When triple piston QT 166S begins to move, the gradu-ating valve moves first to uncover the service ports in exhaustvalve QT 162S; then the exhaust valve is moved until the grad-uating ports in the exhaust and its seat come in register. Inthis style of triple valve but one slide valve is moved at a time. 278 NEW YORK QUICK ACTION TRIPLE VALVES. Different Types. This style of triple valve can easily be dis-tinguished from the freight and lo-inch passenger triple valves,as the letter S is cast in the body of the valve and the triplevalve is fastened to the brake cylinder with three studs. The let-ter S is also stamped or cast on all parts of this valve that arenot interchangeable with those of the other valves mentioned. I 3,4
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