Patent ID: 7621296

Claim:
A separation element for a pressure compensation in a pressure compensation vessel, pressure reservoir or pulsation damper, wherein the separation element is of a multi-layer structure comprising: at least two mutually superposed flexible, fluid-tight material layers ( 1 , 2 ), and at least one spacer element ( 3 ) which is arranged between the flexible, fluid-tight material layers and holds them at a spacing relative to each other, wherein the at least one spacer element is such that the space between the flexible, fluid-tight material layers ( 1 , 2 ) is at least partly adapted for fluid to flow therethrough, and at an edge region of the multi-layer structure the separation element has a sensor region (S) which is in a communication with remaining space between the flexible, fluid-tight material layers through which fluid can flow, wherein within the sensor region, the flexible, fluid-tight material layers are designed so that, by virtue of an inflow of fluid between them, an increase of pressure causes an increase in the spacing between the material layers ( 1 , 2 ) relative to each other.