| 摘要 |
A fluid storage tank utilizing an isolation seal in which a leak proof isolation seal covers the entire head of the piston of the storage tank requiring only a single fluid tight seam to seal off the fluid storage chamber from the remainder of the storage tank. The isolation seal has a circumferential notch located proximate to its outer periphery which permits the isolation seal to rupture along a predetermined path. Elastomeric annular seals on the piston provide a dynamic seal to prevent the fluid from leaking while the piston is moving to eject the stored fluid. The isolation seal is welded or otherwise fastened to the interior surface of the tank at a location behind the elastomeric seals so that the latter need not pass over the weld during movement of the piston. The interior of the tank has a first or larger diameter section, a second or smaller diameter section, and a tapered transition section which is disposed therebetween just past the rupture zone of the isolation seal. The larger diameter section enables the first annular seal to clear the jagged edges of the ruptured isolation seal. The first annular seal does not establish tight fitting, sealing contact with the interior of the tank until just before it reaches the second diameter section. The second annular seals spaced sufficiently behind the first annular seal to ensure that an interim seal is provided until the first annular seal reaches the second diameter section.
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