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

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

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Compressors, Gas Turbines and Jet Engines
Producer gas is produced by

Carbonisation of coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 65°C
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

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