Patent ID: 8726977

Claim:
A pressure vessel assembly for a pressurized fluid system, said pressure vessel assembly comprising: an enclosed outer casing; at least one hydraulic fluid accumulator disposed within said outer casing; a compartment within said pressure vessel assembly between said outer casing and said at least one hydraulic fluid accumulator, said compartment at least partially filled with a hydraulic working fluid; said compartment being in fluid communication with said at least one hydraulic fluid accumulator so as to selectively transfer said hydraulic working fluid between said compartment and said at least one hydraulic fluid accumulator; a pressurized gas reservoir external to said outer casing, said pressurized gas reservoir being in fluid communication with said compartment within said outer casing for pressurizing said hydraulic working fluid within said compartment in said outer casing; and at least one internal tube extending within said outer casing so that said at least one hydraulic fluid accumulator being disposed within said at least one internal tube with a clearance; said outer casing including a substantially tubular housing and end members secured at opposite distal ends of said housing.