Patent ID: 7255133

Claim:
Fluid pressure system comprising, in combination: a pressure tank through which fluid passes, with the pressure tank having an axial length and including annular cross sections of a circular shape; and a bladder defining a volume which can compress or expand according to pressure of fluid intermediate the bladder and the pressure tank, with the bladder formed from a cylindrical side wall extending for an axial length between an inlet end plug and an outlet end plug, with the cylindrical side wall including annular cross sections of a circular shape; and a confining element separately formed from the cylindrical side wall of the bladder and intermediate the cylindrical side wall and the pressure tank of an axial length parallel to and at least equal to the axial length of the bladder, with a portion of the confining element having a configuration perpendicular to the axial length of the portion of the confining element which only partially encircles the bladder to prevent the bladder from completely engaging the pressure tank along a peripheral portion.