HOME » Technical specifications

Technical specifications

Scotch Yoke mechanism

The distinctive feature of the ACTUATECH product range are the quarter-turn pneumatic Scotch Yoke actuators. Alternative system to the classic Rack & Pinion, which has numerous advantages, including increased torque and lower air consumption, with consequent energy savings.

The diagram shows the torque development during the valve cycle from close to open and close again.

1. Rack & Pinion flat torque
2. Scotch Yoke canted torque
3. Represent the typical valve torque

The blue area between the Rack & Pinion and Scotch Yoke diagrams shows the Motive Energy Saving, easily verified comparing the compressed air consumption stated in our data table and any Rack & Pinion manufacturer.

BTOV: Break Torque to Open Valve
BTOA: Break Torque to Open Actuator
BTOA = BTOV+SF (Safety Factor)

The diagram shows the torque development during the valve cycle from close to open and close again.

1. Rack & Pinion flat torque
2. Scotch Yoke canted torque
3. Represent the typical valve torque

The blue area between the Rack & Pinion and Scotch Yoke diagrams shows the Motive Energy Saving, easily verified comparing the compressed air consumption stated in our data table and any Rack & Pinion manufacturer.

BTOV: Break Torque to Open Valve
BTOA: Break Torque to Open Actuator
BTOA = BTOV+SF (Safety Factor)

Other Scotch Yoke System Advantages

 Higher Breakaway torque

 Special pistons sealing pack

 Frictionless rotary system

 More torque with same bore

 Less weight

 Stainless steel driving shaft

 Internal lapped cylinder bore

 Powerful spring return actuator end cycle