. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . nioooooo PLATE 61. All piston valves are not alike, some being inside ad-mission and outside exhaust, while others are outside ad-mission and inside exhaust. INSIDE AND OUTSIDE ADMISSION VALVES. An inside admission valve is one in which thesteam enters the steam port of the cylinder from theinside edge of the valve (Plate 59) and is exhaustedfrom the outer edge of the valve. Inside admissionvalves are of the piston type. An outside admission valve is one ia whi
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . nioooooo PLATE 61. All piston valves are not alike, some being inside ad-mission and outside exhaust, while others are outside ad-mission and inside exhaust. INSIDE AND OUTSIDE ADMISSION VALVES. An inside admission valve is one in which thesteam enters the steam port of the cylinder from theinside edge of the valve (Plate 59) and is exhaustedfrom the outer edge of the valve. Inside admissionvalves are of the piston type. An outside admission valve is one ia which the steamenters the steam port from the outer edge and is ex-hausted from the inner edge (Plate 62).. PLATE 6Z. On an inside admission valve the motion of the valveis in the opposite direction to that of the piston motion atthe beginning of the stroke (Plate 59), while on an out-side admission valve the movement of the valve is in thesame direction as that of the piston at the beginning ofthe stroke, (Plate 52). LAP AND LEAD. The width of the opening of the steam port to ad-mit steam into the cylinder when the piston is at the VALVE MOTION. 183 beginning of the stroke (Plate 53) is called the lead ofthe valve. The valve is given lead in order that the steam portmay have a greater opening at the beginning of the strokeof the piston, at the time when it is most needed. It alsopermits an earlier cut-off, in addition to providing acushion against the piston as it nears the completion ofits stroke, which prevents the lost motion in the recipro-cating parts from causing the engine to pound. The steam lap is that part of the valve which over-laps the inside edge of the when th
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