Patent ID: 6988514

Claim:
A hydroaccumulator, comprising: a pressure tank; a separating element located in said pressure tank and separating a gas space bordering a gas-side access from a fluid space bordering a fluid side access in said pressure tank; a fluid connecting sleeve at said fluid side access, said sleeve having an inside surface defining a piston bore with a circular cylindrical surface; a valve body in the form of a flat plate with a closed top surface facing and engagable by said separating element, said valve body being a sliding piston and being slidably received and guided for movement within said inside surface along a longitudinal axis between open and closed positions, said valve body having an elongated first fluid channel extending therethrough and opening on diametrically opposite lateral surface portions of said valve body and having an axial bore opening into said fluid channel at one end thereof and on an axial side of said valve body remote from said fluid space at an opposite end thereof, said valve body having a transverse diameter in a direction perpendicular to said longitudinal axis larger than a height of said valve body measured along said longitudinal axis, said fluid channel opening into said fluid space in said open position and being closed by said connecting sleeve in said closed position; a spring in said connecting sleeve biasing said valve body toward said open position; tapered bore section forming an annular shoulder on an end area of said piston bore adjacent said fluid space; and a radially projecting shoulder surface on said sliding piston opposing said annular shoulder on said connecting sleeve and engaging said annular shoulder on said connecting sleeve in said open position under biasing of said spring to form a stop; whereby, said valve body can be moved by said separating element against biasing of said spring from said open position to said closed position.