| 摘要 |
<p>A dry-break coupler, of the type used on a gasoline tank truck loading arm, is connectable with a standard A.P.I. adapter, that is located near the bottom of a truck tank, for loading fluid into the tank, The coupler and the adapter can be connected together or they can be separated, without the loss of fluid, while both fittings are continuously subjected to internal fluid pressure. The coupler has a tubular body that defines a central flow passage. Located within the tubular body is a movable valve closure element. This element opens and closes the flow passage of the coupler, and is also actuates a central valve of an adjacent adapter. An adapter latch and a first rotatable shaft that operates the adapter latch are pivotally mounted on the tubular body. A second rotatable shaft that operates the valve closure element is mounted within the tubular body. Portions of both the first and second rotatable shafts extend in substantially parallel relationship. Mounted on the shafts is a shaft interlocking mechanism that prevents rotation of the second rotatable shaft, to open the flow passage to the adapter, without first moving the adapter latch to a locked position. The shaft interlocking mechanism also prevents rotation of the first rotatable shaft, to release the adapter latch from the adapter, when the valve closure element is in a position with the flow passage open. -la-</p> |
