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

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

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Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Turbine blades, which is a constant volume process
Turbine blades, which is essentially an isentropic process
Exit nozzle, which is a constant volume process
Exit nozzle, which is essentially an isentropic process

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