Patent ID: 7066211

Claim:
A device ( 1 ) for compensating for pressure drop in a product pipe ( 7 ) through which a liquid flows, comprising a collapsible tube portion ( 2 ) which is connectible to said product pipe ( 7 ), wherein a limiting means ( 3 ), which is inelastic in the circumferential direction and is adapted to counteract stretching of the tube portion ( 2 ) in the circumferential direction, and which is flexible such that it is collapsible freely together with the tube portion ( 2 ) said device further comprising a casing ( 4 ), in which said tube portion ( 2 ) and said limiting means ( 3 ) are arranged, pressure means ( 15 ) arranged to apply a pressure prevailing in the casing ( 4 ), which is slightly below a normal pressure prevailing in the tube portion ( 2 ) in operation.