| 摘要 |
A closure is provided for an accumulator. The closure comprises a drain housing, a spring within the drain housing, and hollow cup-like piston within the drain housing, which is urged into an open position by the spring. With the piston in a closed position, the accumulator port is closed and blocks the bladder from entering the drain. The piston has substantially elliptical drain holes in its cylindrical side wall. With the piston in an open condition, the drain holes extend from within the accumulator housing to within the drain housing. The wall which defines the opening of each drain hole, at the portion adjacent to the closed joint of the piston, is canted so that a vector of the forces attributable to liquids leaving the accumulator is directed against the piston to aid in keeping it open. The spring is a coiled spring, so dimensioned as to be proximate the drain housing wall so as to be removed from the flow of the stored substance as it enters and leaves the accumulator. Further, the spring abuts the piston at the end of the piston which is well within the drainage housing. The diametrcal spacing between the piston and drain housing is such as to permit the stored substances to leave the accumulator with the piston in a closed position.
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