PATENTED FLAT YOKE® ACTUATOR MECHANISM WITH QUAD BODY SLOTS
A unique slotted body concept absorbs 100% of the yoke mechanism’s side loading forces leaving the piston rod completely free of bending stresses while allowing termination of the rod at the yoke, and the addition of a weight and force balancing second force module diagonally offset from the first. The balanced weight makes lifting and handling of the actuators safer and easier, while reducing valve neck stress caused by unbalanced scotch yoke actuators. Internally, the balanced forces assure less friction loss and less wear as there is no net force applied to the shaft bushings. Scotch yoke actuators offer a very wide range of torques and can operate on devices that require a quarter turn movement for on/off or various throttling services.
HIGHER TORQUES
By incorporating the patented Flat Yoke® actuator mechanism, higher torque outputs are offered in a weight and force balanced design.
INHERENTLY CANTED YOKE
The longer yoke arms of the Flat Yoke design allow the advantageous canted yoke torque curve simply by choosing a different travel stop setting. This provides substantially more spring end torque without having to purchase a special actuator. As standard, Flat Yoke actuator travel stops are set to provide a 5-degree canted effect.
BI-DIRECTIONAL TRAVEL STOPS
F actuators feature bi-directional travel stops which allow a minimum of 5 degrees of over travel in each direction. The stops act on the piston motion and impart no side loading on the shaft as occurs with rack & pinion and scotch yoke designs.
THROTTLING
The balanced force, close tolerance, and low friction of the Flat Yoke® actuator impart excellent throttling capability.
| F SERIES – FLAT YOKE® ACTUATOR |
|---|
| DOUBLE ACTING & SPRING RETURN (SINGLE ACTING) |
| Torques to 500,000 in-lb |
| Pressure to suit size |
| Temperatures from -60°F to +400°F | 90° Rotation (±5° at each end of travel) |
