Automatic liquid drain device

An automatic liquid drain device, comprising:

• a body (10) having a water collection chamber (12) and configured such that an upper cap member (11) having a liquid inlet (13) is fastened to an upper portion of the water collection chamber (12);
• a buoyancy valve member (20) embedded to be vertically movable in the water collection chamber (12), the buoyancy valve member (20) having a plurality of downward-inclined ribs (23) provided in a circumferential direction at equal intervals and a drop drain (24), and being provided with a valve packing (25) protruding from a lower center thereof;
• a liquid pooling space (122) formed in a lower portion of the water collection chamber (12) below the buoyancy valve member (20);
• and
• a drain emergency action means (30) provided with a drain nipple (31) having a vertical drain hole (32) whose upper end is exposed to the liquid pooling space (122), and an opening/closing nipple (34) fastened to a lower portion of the drain nipple (31) to open and close the vertical drain hole (32),
• wherein the opening/closing nipple (34) has a conical protrusion wheel part (36) configured to enter and exit the vertical drain hole (32) at a lower center of a fastening hole (35), and a pair of side drain holes (37) is provided, one on each side of the conical protrusion wheel part (36) outside of the conical protrusion wheel part (36), the pair of side drain holes (37) being connected to a drain path below the conical protrusion wheel part (36), and wherein the pair of side drain holes are outside of the conical protrusion wheel part (36).