| 摘要 |
A fluid-tight packing for relatively moving parts, for example, slide valve parts, comprises an active portion for disposition adjacent a first part of the moving parts with which it is in relative movement and a further or base portion fixed relatively to a second part of the moving parts, the active portion being articulated on the base portion so that when, in operation, the active portion tends to be moved in consequence of relative movement between the moving parts, it moves with respect to the base portion thereby enabling the zone of contact with the first of the moving parts to be changed and enabling lubrication to be re-established, the active portion being of substantially part-circular section and having its center located approximately at the point of articulation between the active and base portions.
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