| 摘要 |
A pressure vessel comprising a container to hold contents under pressure. The container has an opening for filling or emptying the container on one end, the opening surrounded by a threaded neck formed with a buttress thread to receive a valve assembly and a sealing gasket on the side of the thread remote from the end of the container. A head locates on the one end of the container and has a plurality of downwardly projecting circumferentially spaced fingers; and a base locates on the opposed other end and has a plurality of upwardly projecting circumferentially spaced fingers, that inter-fit in a non-overlapping manner with those of the head. A sump is formed in the other end of the container and a part of valve assembly extends into that when fitted to the neck. A retaining ring locates around the fingers and holds them against the container to hold the head, base and ring together and resist expansion of the container; and at least two rolling rings separate from the retaining ring that locate around the base and/or head. The parts are made from plastics material, and the head and base are provided with a handling ring in which one or more hand-hold is integrally formed. |
