XL26 - XL1371

1. A unique, exclusive standard provides rotational adjustment on the actuator pinion, in both directions of travel.
2. High performance and special duty valves require precise and specific rotation limits to perform their intended function.
3. Metal seated and high performance butterfly valves need exact rotation stopping between 0° and 7°.
4. Rubber seated butterfly valves often require stopping between 0° and 7° after installation, for optimum seat life. These valves can experience premature seat failure if the disc is forced into the seat.
5. Full port and metal seated ball valves need exactly 0° and 90°.
6. All manufactured items have acceptable tolerances. When the tolerance of the components of an automated valve assembly are added, the actuator must provide compensation by being able to rotate more than 90° with overtravel in both directions, and then continually stop precisely at the required position.
7. Hytork actuators, with patented two way rotation travel stops, provide a minimum rotation of -3° to +93° and positive, adjustable rotation stopping (10° at each end).
8. This unique Hytork combination assures positive sealing, correct port alignment and long life for all valve designs.
9. Single end cap stops and dual end cap stops cannot limit rotation when the actuator pistons are driven together (as in all “fail” strokes) and provide no function. Actuators without sufficient overtravel, in both directions of rotation, cannot assure correct valve functioning.
10. Overtravel and Rotation Travel Stops are required to compensate for the accumulation of tolerances that lead to valve malfunction and damage.

XL2586 - XL4581
On the larger sizes of Actuators the adjustment is obtained by the addition of a simple Stop Block that fits under the Actuator. The Actuator is manufactured with over travel to give -3° to +93° of movement and the bottom mounted Stop Block provides the required adjustment of 10° at each end of the travel.