Patent ID: 7857006

Claim:
A pressure accumulator for dampening pulses, comprising: an accumulator housing having a gas space and a fluid space therein and having opposite first and second inside walls, said second inside wall having an annular extension with a cylindrical guide surface inside said housing; a piston part located and movable in said housing, having a stop at one end thereof engageable with and adjacent to said first inside wall of said housing and having a stop surface on an opposite end thereof engageable with said second inside wall of said housing, said opposite end of said piston part movable along a longitudinal axis thereof within said guide surface maintaining a radial distance and forming an annular gap therebetween; a bellows-shaped separating element supported at one end thereof on said piston part adjacent said stop and at an opposite end thereof on said housing and separating said gas space and said fluid space in said housing with said piston part in a fluid-tight manner, said separating element extending along an outer peripheral side of said piston part from said annular extension to said one end of said piston part; and a definable volumetric portion of a working gas and a liquid fill said gas space, said liquid being an alcohol.