Scotch Yoke Actuators

The Bettis Difference

Project overruns and maintenance costs can be draining on your operation. Bettis Scotch Yoke Modular Actuators are designed to: Provide efficiency and safety.

Keep projects on track with the immediate availability of interchangeable modules.

Deliver better cost of ownership with reduced corrosion and an industry-leading 5 Year warranty.

Lower capital cost with more efficient utilization of space in project design. Improve occupational safety during operation and service, no risk of accidental spring launch.

What is a Scotch Yoke Actuator?

HOW IT WORKS

Scotch yoke actuators are mechanical devices used to automatically open and close valves or dampers.

The scotch yoke is a mechanism that converts linear motion of a bar sliding back and forth into a rotational motion.

The sliding bar is directly coupled to a piston and to a yoke with a slot that engages a sliding block.

When a force is applied to the piston, the sliding block moves in the yoke slot, causing the yoke to rotate.

Modular Solutions

HOW IT WORKS

Change is Power Module, Drive Module and Spring Module constant and Bettis Scotch Yoke G Series actuators in the industry that can provide the flexibility needed for ever changing challenges. G Series modules can be assembled for various valve requirements with three main modules, power, drive, and spring.

Modules are installed and removed easily with a simple plug and play, bolt on approach. No special tools or exhaustive training is required. No other actuator has this level of interchangeable functionality.

Longer Cycle Life

Actuators with external tie bars can suffer from premature corrosion problems due to inadequate “paint” coverage between tie bars, bolts, and cylinder walls.

Bettis Scotch Yoke Modular actuators have no external tie bars, eliminating tie bar failure due to external factors such as corrosion or impact. G-Series actuators incorporate protective internal and external coatings, assuring the actuator’s reliable operation in the harshest of environments. Construction features allow the G-Series actuators to meet IP67M specifications and corrocsion as confirmed by Salt Spray Testing per ASTM B117 criteria

Compact Solution

The Bettis G-Series Scotch Yoke Modular actuator design has the spring inward of piston for a pull motion, instead of having the spring push the piston rod.

More efficient use of space and less weight for the Same Torque

20-30% Weight Reduction
20-30% Space Savings

The inward spring design allows for the actuator’s center of gravity to be closer to the valve shaft, reducing side load and improving valve life. With the G-Series design, weight and space are reduced around 20% to comparable torque of other similar actuators. Due to the more balanced operation, cycle life can be improved up to 40%. Extending the life of equipment and improving up time

Increased Safety

Bettis Scotch Yoke Modular actuators provide the highest safety for spring return actuation.

With it's unique design, the G-Series has no pressure on the end cap and the Tension-Lok™ prevents spring launch.

Tension-Lok positively locks the spring module in place while under load and in pre-compression, avoiding the possibility of the compressed spring launching out of the spring can and causing injury.

The only way to release the spring is by following the correct disassembly procedure, after tension is relieved and the spring is decompressed.