Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . Fig. 121. Ring Type of Emergency Stop. 238 THE STEAM TURBINE horsepower) at 3600 to 4000 revolutions per minute to as highas 9000 kilowatts (nearly 12,000 horsepower) at about 750revolutions per minute, the general application being to direct-connected electric generators for power or lighting purposes. Emergency Valve. Since a steam turbine can accelerate ata rapid rate and this increase in speed is not easily Fig. 122. Emergency Stop Valve. it is importan
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . Fig. 121. Ring Type of Emergency Stop. 238 THE STEAM TURBINE horsepower) at 3600 to 4000 revolutions per minute to as highas 9000 kilowatts (nearly 12,000 horsepower) at about 750revolutions per minute, the general application being to direct-connected electric generators for power or lighting purposes. Emergency Valve. Since a steam turbine can accelerate ata rapid rate and this increase in speed is not easily Fig. 122. Emergency Stop Valve. it is important that all these machines be equipped with simplespeed limiting devices which are operated automatically in emer-gencies. The device shown in Fig. 121 consists of a steel ring(13) placed around the shaft between the turbine and the gener-ator. This ring, which is held in place by stud bolts (4), isplaced in a slightly eccentric position, and the centrifugal forcedue to this unbalancing is counteracted by a helical spring (n). COMMERCIAL TYPES 239 When the speed increases, the centrifugal effort overcomes thespring and the ring moves into a still more eccentric position asindicated by the dotted lines. In this position the ring strikes abell-crank lever, which trips, by means of a simple auxiliarymechanism and the tension rod L (Fig. 122), the throttle valveon the main steam supply pipe. The rod L is connected to thecrank D, which operates to release the spring S, pulling up thegear and throwing out the hook G, which holds the valve
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