Pulse dampeners are widely used in metering pump (dosing pump) piping systems and can be roughly divided into three types: air chamber type, diaphragm type, and bladder type, each with different selection criteria based on their structural features and buffering effects.
- Air chamber type pulse dampener
The air chamber type pulse dampener functions like a pressurized soda can on the pipeline, with the liquid compressed against the air inside to create a buffering effect. However, the biggest drawback is that the air inside the dampener gradually dissolves into the medium, reducing the compressible air volume and decreasing the buffering effect over time. The dampener needs to be removed from the equipment and reconnected to the atmosphere to ensure the air volume inside, making maintenance slightly more complicated. Nevertheless, its low cost makes it suitable for systems with less demanding buffering requirements. The selection method for air chamber type pulse dampeners is to multiply the volume of each stroke (in milliliters) by 26, which yields the minimum volume required to reduce pulsation by 90%.
- Diaphragm type pulse dampener
The diaphragm type pulse dampener consists of upper and lower shells separated by a layer of fluoroplastic diaphragm, which provides a much better buffering effect than the air chamber type. The biggest advantage is that the precharged gas and liquid in the pipeline are separate, making maintenance easier. Our company’s PVC diaphragm type pulse dampener has a maximum pressure resistance of 1.0 MPa, while the stainless steel one has a maximum pressure resistance of 2.5 MPa. The selection method for diaphragm type pulse dampeners is to multiply the volume of each stroke (in milliliters) by 10, which yields the minimum volume required to reduce pulsation by 90%.
- Bladder type pulse dampener
The biggest advantage of the bladder type pulse dampener is its ability to withstand high pressures (our company’s bladder type pulse dampener has a maximum pressure resistance of 31.5 MPa). Its structure consists of an air bladder inside the air tank, filled with a certain pressure of gas. In the pipeline, the liquid compresses the bladder, causing it to shrink and then expand, thus creating a buffering effect. However, the cost of bladder type pulse dampeners is generally higher, and production lead time for special materials may be longer. The selection method for bladder type pulse dampeners is to multiply the volume of each stroke (in milliliters) by 10, which yields the minimum volume required to reduce pulsation by 90%.