HIDRACAR pulsation dampeners

Pulsation dampeners (also called pulsation dampers) are used for stabilizing the flow and the pressure in circuits with volumetric or dosing pumps. They are used in a wide range of applications.

A pulsation dampener is a container with gas inside, normally dry nitrogen.

In every pulsation dampener there is a separator element between the gas it is charged with and the liquid of the circuit; its basic function being to avoid the leaking of the gas into the circuit. This separator element is basically made of two kinds of materials: Rubber (NBR, EPDM, FPM, butyl, silicone, etc…) or a thermoplastic material (normally PTFE); although it can also be made in stainless steel.

When a rubber separator element is used, the dampener is called bladder type. If the material is PTFE, we refer to membrane type and bellows type dampeners, depending on the shape of the separator element.

The bellows can also be made of stainless steel, to suit special dampeners designed for working with high temperature liquids.

Choosing between different types of dampener depends on characteristics of the circuit like working pressure, temperature and chemical compatibility between the liquid and the material of the separator.

All our pulsation dampeners are made according to the European PED97/23/CE pressure vessels regulations, and their design meets the AD-2000 and ASME VIII Div.1 & 8 codes requirements (“U” stamp pending).

We can supply all of our dampeners with different circuit connection gauges as well as fitted with whatever flange, either screwed on, welded or integrated, to suit the customer’s needs.


Hidracar accumulator reference code identification (pdf file).


Questionnaire to calculate the adequate pulsation dampener for dosing pumps (pdf file).



Some technical and practical recommendations about pulsation dampeners in circuits with dosing or volumetric pumps (pdf file).

Calculations for determining the accumulator needed in order to eliminate the fluid hammer effect produced by liquid column backflow in pumping (pdf file).

Some considerations on choosing the size of a dampener: How to reduce the cost when a pulsation dampener is needed in a volumetric pump (pdf file).

Unquestionable benefits of installing a pulsation dampener at the discharge of single-effect dosing pumps (pdf file).

Advantages and drawbacks of using pulsation dampeners either with or without separator element between fluids (gas / liquid) (pdf file).

Pulsation dampener application on an air variable pressure driving membrane pump (pdf file).