. Applied thermodynamics for engineers. Fig. 92. Art. SUCTJON ■ Compressor Cylinder with Rocking Inlet(Clayton Air Compressor Works.). Fig. 93. Art. 242. — Compressor Cylinder with Corliss Valves. (Allis-Chalmers Co.) COMPRESSED AIR TRANSMISSION 139 A gear sometimes used consists of Corliss inlet valves and mechanically operateddischarge valves, which latter, though expensive, are free from the disadvantagessometimes experienced with poppet valves. The closing only of these valves ismechanically controlled. Their opening is automatic. A common rule for proportioning valves and pas
. Applied thermodynamics for engineers. Fig. 92. Art. SUCTJON ■ Compressor Cylinder with Rocking Inlet(Clayton Air Compressor Works.). Fig. 93. Art. 242. — Compressor Cylinder with Corliss Valves. (Allis-Chalmers Co.) COMPRESSED AIR TRANSMISSION 139 A gear sometimes used consists of Corliss inlet valves and mechanically operateddischarge valves, which latter, though expensive, are free from the disadvantagessometimes experienced with poppet valves. The closing only of these valves ismechanically controlled. Their opening is automatic. A common rule for proportioning valves and passages is that the average velocityof the air must not exceed 6000 ft. per minute. Compressed Air Transmission 243. Transmissive Losses. The air falls in temperature and pressure in thepipe line. The fall in temperature leads to a decrease in volume, which is furtherreduced by the condensation of water vapor; the fall in pressure tends to increasethe volume. Pearly experiments at Mont Cenis led to the empirical formulaF — (iv^l -^ d), for a loss of pressure F in a pipe d inches in diameter,I ft. long, in which the velocity is n
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