This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...valves are compactly arranged oue within the other, and they form the actual cylind,r end. Both valves are of the same diameter as the piston itself, their lift is very small, and there is no clearance whatever between piston and valves. It can be run at a high speed, and there is no loss through clearance space. Water cooling can in many cases be dispensed with, as the valves offer a large cooling surface for the compressed air. There are no stuffing-boxes nor crosshead. In fig. 109, a is the suction valve, and b the pressure or delivery valve, which latter is carried by a metallic diaphragm g, which is firmly held at the joint ring c; / shows the spring of the suction valve. The seat of the suction valve is on the pressure valve, and d represents the seat of the pressure valve against the end of the cylinder. The movement of the pressure valve and diaphragm is checked by the spring h, and the tension of this spring can be regulated by the Dut /. The air is drawn in by the central passage, and is discharged by the pipe indicated by the arrow pointing upwards. The pressure space is separated from the suction by the pressure valve b and the diaphragm g. It will thus be seen that the valves close tightly upon the cylinder end, and will open readily when the requited pressures are obtained. The piston may actually touch the surface of the suction valve, thereby raising the pressure valve from its seat. When the piston commences the return stroke the pressure valve closes, and the air is drawn in at once. The flywheel is arranged to form the driving pulley. The cylinder and bearings are lubricated by ordinary drop sight-feed lubricators. Ring lubrication is employed in the main bearings of the crank shaft. When required for pressures not exceeding 120lb. per sq...