Accumulator

An accumulator comprising:

• a housing having a sealing face and a fluid inlet/outlet passage;
• a bellows fixed at least one end to the housing such that an inner space of the housing is hermetically partitioned by the bellows into an interior and an exterior of the bellows, the bellows including a bellows main body capable of expanding and contracting and a bellows cap including an annular seal holder;
• a sealing member formed by covering a disc-shaped substrate with an elastic body that is opposed to and capable of being closely attached to the sealing face of the housing, and
• an annular seal holder fixed to the bellows cap and provided with a holding portion for holding the sealing member on an inner diameter side of the annular seal holder, the fluid inlet/outlet passage of the housing being closed upon a close attachment of the elastic body to the sealing face,
• wherein the accumulator further comprises a pressure releasing flow passage in the form of a through hole passing through in a radial direction is provided in the seal holder, and a communication passage extending in the radial direction so as to partially form a space providing communication between the through hole and the fluid inlet/outlet passage is provided in the seal holder or the sealing face,
• wherein when the elastic body is melted and burnt out, the through hole and the communication passage cooperatively supply fluid from an outside of the seal holder to a contact portion between the disc-shaped substrate and the sealing face of the housing.