Accumulator

An accumulator comprising:

• a housing having a sealing face and a fluid inlet/outlet passage;
• and
• a bellows fixed at 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 provided with a sealing member covered with an elastic body that is opposed to and capable of being closely attached to the sealing face of the housing, 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 spacer placed between the housing and the bellows cap so as to surround the sealing member,
• the spacer being fixed to the housing or to the bellows cap and having a communication passage providing communication between an inside and an outside of the spacer, and
• wherein
• when the elastic body is melted and burnt out and when the spacer is brought into contact with the housing or with the bellows cap, the communication passage and a space formed between the bellows cap and the sealing member substantially coincide with each other in height position of an axial direction.