| 摘要 |
<p>A rotary valve actuator (132) with movable actuator linkage maintained in a constant 'pull-pull' tension, includes a sliding canister (12), rotatable lever (136), and a return spring substantially aligned in-line with each other. The linear motion of the canister in response to an expanding and contracting pressurized bladder (60) is converted through chain linkage (36, 38) into rotary lever motion. The return spring is connected through respective chain linkage to the lever so that pulling tension of the spring/lever linkage rotates the lever and maintains tension on both chain linkages. Adjustable travel stops (171, 173) are provided. In an alternate embodiment the return spring chain linkage is configured at right angles to the linear movement of the canister. A double acting rotary valve actuator with pressurized bladders on opposite sides of a rotatable lever. One bladder is oval shaped. The other bladder is oval shaped with double convolutions enabling the associated canister to be driven with a center rod through the middle of the double convolutions bladder.</p> |
