Liquid-ring compressor including bypass pipe

A liquid-ring compressor comprising:

• a main body accommodating a shaft centrally mounted therein to receive a rotational force from a driving motor;
• a rotor configured to rotate together with the shaft inside the main body;
• a suction port formed at a portion of the main body;
• a discharge port formed at another portion of the main body;
• a bypass pipe mounted between a position adjacent to the suction port in the main body and a position adjacent to the discharge port in the main body;
• and
• an opening/closing valve mounted in a middle of the bypass pipe,
• wherein the opening/closing valve comprises:
• a valve body configured to open or close a flow passage in the bypass pipe;
• a reinforcing coating layer coated on a surface of the valve body, the reinforcing coating layer having a composition comprising urethane powder, paraffin wax, fine oyster shell powder, urea resin, and thermoplastic elastomer;
• and
• a leaf spring mounted inside the valve body, the leaf spring having a “U” shape to increase an elastic pressing force thereof.