The Wilden starter diaphragm pump is a dual chamber diaphragm, positive displacement pump. When each stroke is completed, the

 pump discharges the liquid from one of the two liquid chambers.

Some wetted parts (parts in contact with liquid) are movable. The two diaphragms are connected to each other by a shaft, and there

 are two inlet valve balls and outlet valve balls. A diaphragm separates the compressed air supply from the liquid. The compressed air

 replaces the shaft to push the diaphragm, and the load pressure acting uniformly on the diaphragm replaces the mechanical stress 

generated by the shaft, thus extending the life of the diaphragm. The opening and closing of the valve ball on the valve seat acts as 

a one-way flow guide.

1: Air is compressed through the air valve and enters the back of diaphragm A, and the diaphragm squeezes the liquid chamber. 

This air-driven method can eliminate the mechanical stress of ordinary piston drives, thereby significantly extending the life of the 

diaphragm. When the compressed air pushes diaphragm A away from the central body, diaphragm B at the other end is simultaneously 

pulled toward the central body by the connected central axis. At this time, the air on the back of diaphragm B is discharged from the 

outlet to the outside of the pump. This creates a vacuum state in chamber B, so that the fluid can be pushed away from the valve seat 

through the inlet branch pipe by the outside atmospheric pressure, so that the fluid can freely enter chamber B until it is filled.

2: When diaphragm A, which is squeezed by air, reaches its displacement limit, the air valve will guide the air to the back of diaphragm B, 

which will also form a squeezing force to push it away from the central body, and at the same time, the connected diaphragm A will be 

Pull back the center body. At this time, the hydraulic pressure generated by the driving of diaphragm B will push the inlet valve ball back 

to the valve seat, and at the same time push the outlet valve ball away from the valve seat so that the fluid can be squeezed and discharged 

from the outlet out of the pump body. The action of pulling diaphragm A back to the central body creates a vacuum state in chamber A, so

 that the fluid can be pushed away from the valve seat through the inlet branch pipe by atmospheric pressure and enter chamber A until it is filled.

3: When the movement of the diaphragm is completed, the air valve again guides the air to the back of diaphragm A, and diaphragm B 

performs air discharge action at the same time. When the pump returns to its original starting state, the two diaphragms in the pump 

each complete a process of air discharge or fluid discharge. This constitutes a cyclic pumping process. Depending on the usage conditions,

 the pump will reach the self-priming state through several complete cyclic pumping actions.