Description
scotch Yoke actuatorThe Scotch Yoke pneumatic actuator is a high-performance device designed for precise and efficient valve control in diverse industrial applications. Utilizing a distinctive yoke and piston mechanism, it converts the linear force of compressed air into rotational motion, making it particularly effective for quarter-turn valves, such as ball and butterfly valves.
Engineered to deliver exceptional torque output, the scotch and yoke actuator excels in demanding environments, including oil and gas, petrochemical, and power generation sectors.
Scotch yoke pneumatic actuator is built in line with the latest design solution and is a safe and reliable driving mechanism for operating on-off or regulating ball valves, butterfly valves, plug valves and other 0°~90° rotating mechanical devices.
- The connection dimensions and torque range of the pneumatic actuator base are designed based on ISO5211 standards.
- The valve actuator can provide a torque output of up to 250,000Nm (184,000 foot-pounds), and its shift fork design significantly reduces lateral loads, thus greatly enhancing performance.
- Its modular structure design gives the product parts great interchangeability, making the product easier and cheaper tousle and maintain.
- Configure the corresponding materials according to the operating temperature range of the actuator to meet the working conditions of different occasions.。
- The cylinder module with a built-in guide rod solves the problem of local wear of the piston seal caused by the piston’s own weight and the lateral force of the shift fork, ensuring long-lasting and stable output of the actuator.
- Available manual operating mechanism options: handwheel, gear transmission and hydraulic.
- Symmetrical or tilted shift forks available for customer selection. The optimized transmission module and torque ratio have higher adaptability to the valve torque.
- The shift fork transmission mechanism is realized using oil-free lubricated bearings of aluminum bronze composite graphite, which has stable and durable performance.
- A portion of the connecting shaft holes are connected using square shaft to improve accuracy and are especially suitable for regulating (control valve) applications.
- Single-action fail-open or fail-close is achieved by changing the direction of the cylinder and spring module, which is efficient and convenient.
Design Parameters
Torque range
– Double-action: 250,00ONm (184 000 ft lbs)
– Single-action: pneumatic 250,000Nm (184 000 ft lbs)
Spring 110,000Nm (81000 ft lbs)
Air supply pressure
3.5~7BAR (51~101psi)
Air, nitrogen or other pure gases
Temperature range
Normal temperature: -29°C~80C ( -20°F~176°F)
Low temperature: -40°C~80°C ( -40°F~176°F)
Ultra low temperature:-60°℃-80°C (-76°F~176°F)
High temperature: -29°C-160°C ( -20°F~320°F)
Adjustable stroke (0-90°)±6° , total stroke range:80~100°
Design and Manufacturing Standards
EN60529 of P66、IP66M、IP67、IP67M
NEMA 250 of NEMA4 and NEMA4X
EN 60529
EN 13906-1
EN 15714-3
IEC 60079-0
IEC 60721-2-1
IEC 61508
ISO 9001
ISO 5211
ISO 5599
ISO 12490
ISO 12944-2
Scres rod manual actuator
Gear manual module actuator
Hydraulic cylinder module actuator
Scotch yoke actuator download
Scotch yoke actuator FAQ
What is a Scotch yoke pneumatic actuator?
Scotch yoke pneumatic actuator is a device used to automate valves in industrial processes. It converts linear motion from compressed air into rotational motion, using a mechanism known as a Scotch yoke. This type of actuator is commonly used in applications that require high torque and precise control.
How does the Scotch yoke mechanism work?
The Scotch yoke mechanism consists of a yoke, a piston, and a sliding pin. When compressed air is applied to the piston, it moves linearly. This linear motion is then converted into rotational motion by the yoke through the sliding pin, which engages with the slots in the yoke.
What are the advantages of using a Scotch yoke pneumatic actuator?
- High torque output: The Scotch yoke design provides higher torque than other actuator types, making it ideal for heavy-duty applications.
- Compact size: Due to its efficient design, Scotch yoke actuators are more compact, saving valuable space in industrial settings.
- Durability: These actuators are built to withstand harsh environments and provide long-lasting performance.
- Precise control: The Scotch yoke mechanism allows for fine adjustments, ensuring accurate valve positioning.
How do I select the right Scotch yoke pneumatic actuator for my application?
- When selecting a Scotch yoke actuator, consider the following factors:
- Torque requirements: Determine the torque needed to operate your valve.
- Pressure range: Ensure the actuator can handle the available air supply pressure.
- Environmental conditions: Choose an actuator with materials and coatings suitable for the operating environment.
- Control requirements: Consider the level of control needed for your application, such as on/off or modulating control.
