Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . FlG. 125a. Latest Construction of Blade Wheels of Curtis Two-stage Turbines. The most recent improvement in valve gears on Curtis tur-bines is shown on the turbine illustrated in Fig. 125b. The. Fig. 125b. Horizontal Curtis Steam Turbine with Latest Steam-operated Valve Gear. 242 THE STEAM TURBINE centrifugal governor is placed at the upper end of a vertical shaftbetween the turbine and generator, which is driven by wormgearing from the main shaft of the turbine. The mot
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . FlG. 125a. Latest Construction of Blade Wheels of Curtis Two-stage Turbines. The most recent improvement in valve gears on Curtis tur-bines is shown on the turbine illustrated in Fig. 125b. The. Fig. 125b. Horizontal Curtis Steam Turbine with Latest Steam-operated Valve Gear. 242 THE STEAM TURBINE centrifugal governor is placed at the upper end of a vertical shaftbetween the turbine and generator, which is driven by wormgearing from the main shaft of the turbine. The motion of themain governor is transmitted to the valve gear * by means oflevers and rods, which operate a small pilot valve, controllingthe admission of steam to a steam cylinder at the upper end ofthe valve mechanism. That is, the pilot valve serves to admitsteam either above or below the piston in the steam piston rod extends into the steam chest and on this rodare mounted a series of spiders, which engage a correspondingseries of annular double-seated admission valves. The spiderson the valve rod are arranged so that the valves are lifted fromtheir seats in sequence as the rod is raised by the steam cylinderunder control of the pilot valve. As each of the valves is liftedfrom its seat, steam is ad
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