Before we go into the features of a diaphragm pump, we will briefly explain how these pumps work. To understand how they function, take a look at how the injection syringe works. When the piston is pulled backwards, the liquid is pulled into the cylinder. Pushing the piston forward discharges the liquid through the injection needle. With the injection syringe, the liquid enters and leaves from the same point but in diaphragm pumps the liquid enters at one point and exits at the other. Now let us take a look at some of the top features of these pumps.

Liquid flows with pulsation

Liquid flows intermittently due to suction and discharge alteration. This principle is called the pulsation. It makes diaphragm pumps different from centrifugal pumps.

Sealing of the check valve is vital

Diaphragm pump manufacturers in New Zealand advise on sealing the check valve of the pumps. Sealing is compromised when foreign matter and dirt enters the check valve. The non-return function is disabled in such an event. This severely impairs the performance of the pump in such a way that the pump stops discharging in some cases. The same condition may occur when the valve seat or the check valve is damaged.

If the valve seat and the check valve are dry, the air that passes through the gaps between the irregular surfaces can affect the performance. In such a case, it is important to wet the seat and the check valve with liquid to improve sealing and make the discharge and suction possible.

Liquid entering the cylinders always flows out from the upper side

Even when pressure is applied to the upper side, holding down the check valve as long as the force pressing the piston or the power allows the pressure inside the diaphragm pump cylinder increases.