The screw compressors of the dry compression used for compression and submission of gas not polluted oil. Oil-filled air and gas compressors which are used for compression of the gas compatible to oil, also injected into a working cavity of the compressor. The refrigerating compressors are working in refrigerating machineries on ammonia, freon, etc.

Engines are intended for a drive crain and other mechanisms working in short-term and is repeated-short-term modes, including with frequent start-up and electric braking.
Engines can be used also for mechanisms of a long operating mode.

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