. The lay-out of Corliss valve gears. sed by the ex-haust valve is the one at the lower sideof the valve leading from the valve-seatbore to the exhaust-pipe passage. Theother port between the cylinder andvalve-seat bore is opened by the valve in-cidentally, and is not the working the steam pressure in the cylinderis always greater than that in the ex-haust pipe, the valve is held tightlyagainst the lower port. Sometimes thisport is placed somewhat at the side in-stead of directly below the valve-seatbore, as shown in Plate II. Occasionally double-ported valves areused with two ports
. The lay-out of Corliss valve gears. sed by the ex-haust valve is the one at the lower sideof the valve leading from the valve-seatbore to the exhaust-pipe passage. Theother port between the cylinder andvalve-seat bore is opened by the valve in-cidentally, and is not the working the steam pressure in the cylinderis always greater than that in the ex-haust pipe, the valve is held tightlyagainst the lower port. Sometimes thisport is placed somewhat at the side in-stead of directly below the valve-seatbore, as shown in Plate II. Occasionally double-ported valves areused with two ports opening simulta-neously. This is not usually considerednecessary, however. Attached to the ends of the valves arevalve stems passing to the outside of thecylinder through stuffing boxes. It ison these valve stems that the arms movedby the links are fastened. The exhaust 11 arms are directly fastened to the exhaustvalve stems, so that the motion of theexhaust valves is constant, regardless ofthe load on the engine, as already Fig. 1. Reynolds Latch Mechanism. The steam valves are operated some-what differently. Each steam link oscil-lates a bell crank/ which is loose onthe steam valve stem. On this bellcrank is a latching gear of some kind 12 which is arranged to take hold of a steamarm directly attached to the steam the bell-crank moves, the steam valve KOD
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