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Diaphragm Pump Working Principle

Diaphragm pump working principle in the pump of the two symmetrical working chamber each equipped with a diaphragm, by the center of the connecting rod to form a whole.

Compressed air from the inlet of the pump into the distribution valve, through the distribution mechanism will be compressed air into one of the cavity, promote the diaphragm movement in the cavity, and the other cavity of the gas discharge.
Once it reaches the end of the trip, the valve distribution mechanism automatically introduces the compressed air into another working chamber and pushes the diaphragm to move in the opposite direction, thus making the two diaphragms reciprocate continuously and synchronously.

In the figure, the compressed air enters the distribution valve and causes the diaphragm to move to the right. The suction force of the chamber causes the medium to flow through the inlet and pushes the ball valve into the chamber. The ball valve is locked due to inhalation.
The medium in the room is extruded, push the ball valve from the outlet outflow, at the same time the ball valve lock, anti-flow, so that the circulation of the medium constantly inhaled from the entrance, the exit of the discharge.

Diaphragm pump driven by compressed air

The directional air distribution valve and the guide valve, called the “air chamber”, are located in the center of the pump.
The medium flows through two bus-tubes and an outer diaphragm chamber, known as the “medium chamber”.
Usually check valves (ball or sheet type) are located at the top or bottom of each external diaphragm chamber or share a bus.
The two outer diaphragm chambers are connected by suction and outlet joints, and the pump is self-priming.

During operation, the air distribution valve alternately controls the pressurization of each diaphragm.
After each stroke, the valve will automatically change position, so that the air can switch to another diaphragm chamber, so that the two diaphragm chambers form an alternate suction and pressure stroke, the diaphragm moves in a parallel path, the air valve does not need oil lubricating oil, this is the preferred operation mode;
Clean, dry air can improve pump performance.

As the medium passes through the diaphragm pump, the check valve opens and closes. This causes each outer diaphragm chamber to fill and drain alternately. The check valve responds to the pressure difference.
Ball check valves can handle medium containing small particles, while sheet check valves can handle medium containing soft particles close to the size of the pipe diameter.

When the air distribution valve lets the compressed air enter the left diaphragm chamber, the diaphragm is pushed outward under pressure, and the pressure supply stroke is formed. The medium in the pressure supply department is forced to leave the left external diaphragm chamber, check valve, bus pipe, and then flows out of the outlet of the pump. The outlet position can be top, bottom, or side.

When left diaphragm chamber pressure launch, diaphragm connection rod inside the drag right diaphragm inward retract a check valve is full of fluid, in the cycle action is completed, air distribution valve will automatically transform position, make the air switch to another diaphragm chamber, reverse repeat the cycle, namely, on both sides of the diaphragm chamber will therefore appear alternately delivery and absorption liquid movement.

This is Diaphragm pump working principle. Hope it help you.

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