Abstract: A novel structure of pressure container is disclosed, wherein a safety valve is provided within an air injection valve of said pressure container, whereby even when the ambient atmosphere of said accumulator has been heated up to a high temperature because of a fire and the like, bursting of said pressure container may be prevented. A valve seat is formed inside of a valve casing and a fusible valve member is brought in contact with said valve seat, so that when the ambient temperature of said pressure container has been raised said fusible valve member may fuse to permit the gas pressure in the pressure container to be discharged to the exterior of the container.

Abstract: In an accumulator consisting of a high pressure cylindrical oil vessel and a gas bladder of same figure concentrically housed therein, at the bottom of said gas bladder is provided a cushion cup with its opening upside, when the gas bladder expands in a longitudinal direction said cushion cup comes to directly contacts a poppet valve provided at the port of said oil vessel so that the bladder is not ruptured and when the gas bladder contracts in a longitudinal direction, said gas bladder can get away easily from the poppet valve.

Abstract: Accumulator consisting of a container body and a lid body. In assembling, first the open portion of the bladder is attached to the open portion of the lid. Thereafter, the joint portions of the lid body and container body are welded. A guide ring connected to a bladder holding ring is placed at the inner face of the joint portion of the lid body and container main body, said guide ring is then bonded to the lid body and the bladder holding ring is applied to the bladder. With the bladder holding ring and container main body, the flange portion of the bladder is pressed against the inner wall of the container.