International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 440
inder are fitted withinlet valves D and D\ which allow the air to enter the 428 PNEUMATICS. cylinder, and both ends of the upper half are fitted withdischarge valves F and F\ which allow the air to escapefrom the cylinder after it has been compressed to therequired pressure. Suppose the piston A to… … FlG. 198. comes the resistance of the light spring C, thus allowingthe air to flow in and fill the cylinder. On the other side ofthe piston, the air is being compressed, and, consequently,it acts with the springs S to force the inlet valves D in theright-hand end of the cylinder to their seats. In…
Railroad engineering
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