Composite exhaust valve for the drum-shaped body of the valve, the main internal stainless steel ball containing B (STAINLESS STEEL BALL), rod (FLOAT ARM) and plug (POPPET). The valve installed at the pump outlet or at the Match in the water pipeline to exclude a large number of the air tube assembly, or in the pipeline at the assembly of higher air emissions to the atmosphere in trace amounts, in order to improve the efficient use of pipelines and pumps, and Once a negative pressure inside the tube occurs, this valve quickly inhale outside air to protect the pipeline because of the negative pressure produced by the damage.