Patent ID: 7013923

Claim:
A metal bellows hydraulic accumulator comprising: a pressure vessel defining a pressure space; a bellows unit having a bellows portion formed of metal, the bellows unit being disposed within the pressure space and sectioning the pressure space into a gas chamber filled with a pressurized gas, and a liquid chamber communicating with a liquid passage formed in the pressure vessel; a partition member for sectioning the liquid chamber into a first liquid chamber to which the bellows portion of the bellows unit is exposed, and a second liquid chamber to which the liquid passage is opened; an open-close valve which establishes communication between the first liquid chamber and the second liquid chamber when opened, and breaks the communication between the first liquid chamber and the second liquid chamber when closed, to thereby restrict the amount of contraction of the bellows portion of the bellows unit; separation means, provided in the second liquid chamber, for separating foreign matter contained in operating liquid flowing toward the liquid passage; and a foreign-matter storing section provided in the second liquid chamber, the foreign-matter storing section having an open upper end and a closed bottom portion, and being capable of storing the foreign matter.