The Westinghouse Parsons Steam Turbine a Description With Suggestions And Inst
The Westinghouse Parsons Steam Turbine a Description With Suggestions And Inst
Westinghouse Machine Company
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This pump should be located lower than the turbine so that the oil can run to it by gravity. Its throttle valve should be within easy reach of the operator starting or stopping the turbine. The oiling systems in different types of machines vary in their detailed arrangements, but the general principles are as set forth above. Automatic Safety Stop: All turbines now built are equipped with automatic safety stop valves to shut down the turbine in case the normal speed is exceeded by a predetermin...ed amount. This auto- matic stop valve is operated by a small valve actuated by an automatic stop governor. The general type of governor and governor valve is shown in Figure 12. When the speed of the turbine for any reason rises above normal and reaches a predetermined limit, the governor weight is thrown out by centrifugal force. This limit is of course fixed or adjusted by the compression put on the gov- ernor spring. The weight on flying out comes in contact with- a trigger cam, causing the trigger to disengage from the gov- ernor valve lever, relieving the compression on the governor valve spring, and allowing the governor valve to open freely.
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