The method of the diaphragm pump is only available when choosing a pneumatic execution agency. Its action method is formed by the combination of positive and negative effects and the positive and negative effects of the valve. There are 4 combination forms that are positive (Qi Guan type), positive and negative (open type), anyway (open type), and anti -anti -(gas pass). There are two types of openness. The choice of the action method of diaphragm pump is mainly considered from three aspects:

a) Process production safety;

b) The characteristics of the medium;

C) The quality of product quality is guaranteed, and the economic loss is the least.