Working principle: ball bucket free semi floating ball type steam valve only 1.5 float for moving parts, opening down, the ball barrels that are opening and closing pieces, but also seals. When the device has just started, the air inside the pipe and low-temperature condensation of water through the tubes into the trap, the valve components of the bimetal emptying barrels bounce the ball, the valve open, air and cold condensate discharge quickly. When the steam drum into the ball, the ball barrels produced upward buoyancy, and temperature inside the valve, dual metal components emptying contraction poke the ball float to the valve port, the valve closed. When the steam in the ball barrel becomes condensed water, the ball bucket loses buoyancy, sinks down, opens the valve, and condenses the water rapidly. When the steam enters the ball barrel, the valve closes again, intermittently and continuously. Because the valve seat is separated from the water seal, the water vapor is separated and there is no work at the time蒸汽泄漏。