Patent ID: 7861887

Claim:
A pressure vessel comprising: a main body including a reinforcing portion which has a tubular configuration, and a liner portion which is composed of resin and covers an inner peripheral surface of the reinforcing portion; a mouth ring integrally formed with the main body to interconnect an interior and an exterior of the main body with each other; and a valve to be inserted in the mouth ring on an inner peripheral side thereof, wherein: the mouth ring includes a cylindrical boss part, and a flange part which projects outwardly from an outer peripheral surface of the boss part; the liner portion is integrally formed with the mouth ring and includes a flange seal part which covers a bottom surface of the flange part, and a boss seal part which is formed continuously with the flange seal part to cover at least one part of an inner peripheral surface of the boss part in the axial direction thereof, the boss seal part including a boss-side collar part which projects outwardly, and a sealing member composed of a resilient body being disposed in a space between an inner peripheral surface of the boss seal part and an outer peripheral surface of the valve; the flange part has a flange groove which opens on the side of the bottom surface of the flange part, and the flange seal part has a flange-side collar part which enters the flange groove; the boss seal part covers the inner peripheral surface of the boss part in one part which extends in the axial direction thereof, and a ring-shaped sub-sealing member is disposed in a space between the other part of the inner peripheral surface of the boss part, which is not covered with the boss seal part, and the outer peripheral surface of the valve; the boss part has a boss groove that opens on the side of the inner peripheral surface of the boss part; and the boss seal part enters an interior of the boss groove.