Steam Turbines: a book of Instruction for the Adjustment And Operation of ...
Steam Turbines: a book of Instruction for the Adjustment And Operation of ...
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51). The valve may be opened by hand by means of the lever K, to see if it is per- fectly free.
The secondary valve is somewhat different in its action. Steam is admitted to both sides of its actu- ating piston through the needle valves M A/, and the chamber from which this steam is taken is connected with the under side of the main admission valve, so that no steam can reach the actuating piston of the secondary valve until it has passed through the pri- mary valve. When the pilot valve is clo...sed, the pressures equalize above and below the piston N and the valve remains upon its seat. When the load upon the turbine exceeds its rated capacity, the pilot valve moves upward so as to connect the space. above the piston with the exhaust L, relieving the pressure WESTINGHOUSE-PARSONS TURBINE 85 upon the upper side and allowing the greater pressure below to force the valve open, which admits steam to the secondary stage of the turbine.
86 STEAM TURBINES It would do no good to admit more steam to the first stage, for at the rated capacity that stage is taking all the steam for which the blade area will afford a passage.
What to read after Steam Turbines: a book of Instruction for the Adjustment And Operation of ...?
You can find similar books in the "Read Also" column, or choose other free books by Collins Hubert Edwin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
51). The valve may be opened by hand by means of the lever K, to see if it is per- fectly free.
The secondary valve is somewhat different in its action. Steam is admitted to both sides of its actu- ating piston through the needle valves M A/, and the chamber from which this steam is taken is connected with the under side of the main admission valve, so that no steam can reach the actuating piston of the secondary valve until it has passed through the pri- mary valve. When the pilot valve is clo...sed, the pressures equalize above and below the piston N and the valve remains upon its seat. When the load upon the turbine exceeds its rated capacity, the pilot valve moves upward so as to connect the space. above the piston with the exhaust L, relieving the pressure WESTINGHOUSE-PARSONS TURBINE 85 upon the upper side and allowing the greater pressure below to force the valve open, which admits steam to the secondary stage of the turbine.
86 STEAM TURBINES It would do no good to admit more steam to the first stage, for at the rated capacity that stage is taking all the steam for which the blade area will afford a passage.
What to read after Steam Turbines: a book of Instruction for the Adjustment And Operation of ...?
You can find similar books in the "Read Also" column, or choose other free books by Collins Hubert Edwin to read onlineMoreLess
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