The equations on the maximum breathing capacity for breather valve are given by theoretical analyses and calculations, and it is considered that the diameter of breather valve to be selected should be on the basis of the maximum suction capacity of induction valve. 通过理论分析和计算,给出了呼吸阀最大通气量的计算公式,并认为呼吸阀口径的选取应以吸气阀侧的最大吸气量为依据。