Water-lubricated compressor

A water-lubricated compressor comprising:

• a compressor body;
• a water separating/recovering unit disposed in a discharge channel of said compressor body;
• a water circulation channel for supplying water separated by said water separating/recovering unit to a water supply portion in said compressor body;
• a water cooler disposed in said water circulation channel;
• a discharge on-off valve disposed in said discharge channel at a position between a discharge port of said compressor body and said water separating/recovering unit;
• a water circulation on-off valve disposed in said water circulation channel at a position between said water cooler and said water supply portion in said compressor body;
• a gas release channel providing communication between a gas phase portion of said water separating/recovering unit and the exterior of said water separating/recovering unit;
• a gas release on-off valve disposed in said gas release channel;
• and
• a controller adapted to make control so as to open said discharge on-off valve and said water circulation on-off valve and close said gas release on-off valve when said compressor body is in operation, and so as to close said discharge on-off valve and said water circulation on-off valve and open said gas release on-off valve when said compressor body is not in operation.