Air Chamber

Let's look at Fig. 15 in "2-2. Pulsation: Peak Flow Rate" in reverse order from (3) to (1). Pulsation can be eliminated by simplifying the sine curve property as shown in (3) to that shown in (2) and using the halved peaks to fill in the gaps as shown in (1). (Fig. 1)

In fact, the following can be achieved by using an air chamber.

Here we will again use a syringe as a model to explain what is happening. (Fig. 2)

First, firmly hold and close the exit of the syringe using your finger. (1)
Next, push the piston in the direction of the arrow. You will feel increasing resistance. (2)
Then, relax your hold on the piston. The piston will be immediately pushed back to its original position (3)

Let's go over this theoretically.
The pressure of the air inside Syringe (1) is atmospheric pressure.
When the piston is pushed in as shown in the illustration for Syringe (2), the air inside is compressed.
"Compressed" here means that the pressure of the air is increased.

In Syringe (2), if the volume of gas is 1/3 of that in Syringe (1), the pressure inside is tripled. The reason you feel that resistance is increasing as you push the piston is because the pressure inside is increasing.
When you relax the force pushing the piston, the piston is pushed out to where it balances with the ambient pressure (atmospheric pressure), which is the original position.

Air chambers are also discussed in the Topic ("Metering Pump Accessories"), under the title "Air Chambers", which we hope that you will also check out.

In the next section, we will look into the working principle of an air chamber.

TACMINA's Smoothflow Pump can provide continuous metered transfer without the use of an air chamber. While keeping the advantages of a diaphragm pump, our Smoothflow Pumps can resolve your dissatisfaction with liquid transfer.
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