er and down to the bottom of the cylinder , Y inch of clearance being quite sufficient be - tween the piston and the end of the cylinder at the top and bottom . The valves are of the piston description , fitted with metallic packing rings and junk rings , similar to the main piston ; and they work… … nozzle between the valves , while the exhaust Fig . 155 . — Nozzle Chest for takes place on the top edge of the top valve Steam Cylinder . a , steam pipe . bb Valve anc i ( - j le bottom edge of the bottom valve ; the pipes . d d , Expansion jomts . steam from the top passing through pipes on each…
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