| 摘要 |
A decomposition vessel comprises a rigid bucket of a plastic material resistant to chemical attack, totally enclosed in a supporting metal vessel which consists of a cylindrical supporting member and of a flat cap adapted to be screwed onto the supporting member so as to close the vessel tightly. Sealing means are provided between the opposed flat faces on the cap and the supporting member in the form of a sealing disc adjacent the flat cap and an outwardly exending flange integral with the rigid bucket in contact with the disc and with an upper planar face of the supporting member. The cap can be rotated and closed on the threaded supporting member by means of a closing tool having projecting teeth or pins adapted to engage with slots provided along the top edge of the cap, while the supporting member is held in position in a second tool provided with similar teeth or pins adapted to engage with corresponding slots along the bottom edge of the member; the latter tool is either fixed to a bench or held by hand. The closing pressure is indicated by the position of a mark on the rim of the cap in relation to a scale provided on the outside surface of the supporting member, which permits the selection of the desired pressure after the vessel has been closed by hand, by rotating the upper tool until the respective marks coincide.
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