The valve body type is the most important link in the selection of diaphragm pump. There are many types of diaphragm pump valve bodies.

(1) The shape and structure of the valve core are mainly considered according to the selected flow characteristics, unbalanced force and other factors.

(2) Wear resistance: when the fluid medium is a suspension containing high concentration of abrasive particles.

(3) Corrosion resistance: since the medium is corrosive, the valve with simple structure shall be selected as far as possible when it can meet the regulation function.

(4) Temperature and pressure of medium: when the temperature and pressure of medium are high and change greatly, the valve with small temperature and pressure change shall be selected for the material of valve core and valve seat.

2. Diaphragm pump selection

(1) Consideration of output force

No matter what type of actuator is, its output force is used to overcome the load effectively (mainly refers to the action of unbalanced force and moment plus friction, sealing force, gravity and other related forces).

(2) Determination of actuator type