| 主权项 |
1. An apparatus comprising:
an enclosure having a wall separating a first volume from a second volume; the wall defining a hole having a diameter and allowing passage between the first volume and the second volume; a wire passing through the hole; and a gasket surrounding the wire at the hole, the gasket comprising:
a first section including a groove between a first flange and a second flange, the groove having an outer diameter matched to the diameter of the hole and the flanges having outer diameters greater than the diameter of the hole,a second section adjacent the first flange and including a tubular portion having a diameter less than the diameter of the hole, and a tapered section smoothly transitioning from the diameter of the tubular portion to the diameter of the first flange, anda bore passing through the first and second sections and having an inner diameter matched to the diameter of the wire; the gasket preventing flow of fluid through the hole between the first volume and the second volume; wherein the diameter of the bore and the coefficient of friction solely between the gasket and the wire are such that before being positioned in the hole, the force required to pull the wire through the gasket is more than the force required to pull the tapered section and the first flange of the gasket through the hole, and the diameter of the bore, the outer diameter of the groove, and the coefficient of friction solely between the gasket and the wire are such that when positioned in the hole, the force required to pull the wire through the gasket is less than the force required to pull the second flange of the gasket through the hole. |
