Compressors, Gas Turbines and Jet Engines
For slow speed large capacity compressor, following type of valve will be best suited

Poppet valve
Any of the above
Mechanical valve of the Corliss, sleeve, rotary or semi rotary type
Disc or feather type

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Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Compressed air before entering the combustion chamber is heated
Exhaust gases drive the compressor
Bled gas from turbine is heated and readmitted for complete expansion
Heated

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

May increase/decrease depending on compressor capacity
Decreases with increase in compression ratio
Increases with increase in compression ratio
In not dependent upon compression ratio

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