In the field of hydraulics, PRONAL supplies components, the main function of which is the protection of hydraulic circuits.

A range of elastomer compensators is available for the separation of two media (liquid and/or gaseous) and the protection of oil against external contamination, including dust, humidity, etc.. They are generally fitted on the interior of oil tanks.

Surge control membranes are used by manufacturers of pressurized tanks and containers, and by manufacturers of accumulator batteries, in order to neutralize the effects of overpressure.

In the electricity industry, PRONAL supplies deformable separators to offset fluctuations in the volume of oil contained in instrument transformers or power transformers, associated with variations in temperature.