Accumulator

An accumulator comprising:

• a pressure container including a liquid pressure port connected to a pressure pipe;
• a tubular bellows arranged telescopically along an inner wall of the pressure container;
• a bellows cap configured to close one end of the bellows to divisionally define, in cooperation with the bellows, a liquid chamber communicating with the liquid pressure port and a gas chamber in which a pressure gas is enclosed;
• and
• a stay provided with a through hole, the stay partitioning the liquid chamber into a closed liquid chamber on a side of the bellows and an open liquid chamber on a side of the liquid pressure port wherein:
• the bellows cap includes an elastic abutment part provided with an annular sealing part positioned around the through hole to face the through hole, and a buffering part positioned on a radially inner side of the sealing part;
• communication passages always communicating with the through hole are formed in the buffering part of the elastic abutment part;
• and
• the communication passages comprise a plurality of radial grooves extending in a radial direction and at least one circumferential groove coupled to the radial grooves and extending in a circumferential direction.