Description
The single-acting Scotch yoke pneumatic actuator serves as an efficient valve driving mechanism meticulously engineered to precisely regulate valve switching and cutoff operations. Utilizing a sophisticated yoke and piston mechanism, it converts the linear force generated by compressed air into robust, high-torque rotational movement. This design is particularly well-suited for quarter-turn valves, such as ball and butterfly valves.
The single acting Scotch Yoke pneumatic actuator apart is its integrated spring return mechanism, which ensures fail-safe operation. In the event of air supply failure, the actuator automatically returns the valve to its default position, thereby enhancing safety and operational reliability.
Compliant with industry standards – Designed to meet ISO5211 standards, our single acting scotch yoke pneumatic actuator is a reliable and efficient choice for your valve system.
- High torque output – Capable of up to 250,000Nm (184,000 foot-pounds) of torque, our actuator can handle even the most demanding applications with ease.
- Enhanced performance – Our shift fork design reduces lateral loads for smoother operation and improved performance. Plus, its modular structure allows for easier maintenance and part interchangeability.
- Built to last – With a cylinder module featuring a built-in guide rod, our actuator prevents wear on piston seals and ensures long-lasting and stable output. Oil-free lubricated bearings also provide durable and consistent performance.
- Versatile options – Choose from manual operating mechanisms such as handwheels, gear transmission, or hydraulics. We offer symmetrical or tilted shift forks for customization to fit your needs.
- Fail-safe operation – Easily switch between single-action fail-open or fail-close modes by changing the direction of the cylinder and spring module. Efficient and convenient for regulating applications.
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
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Single acting scotch yoke pneumatic actuator FAQ
What is a single acting scotch yoke pneumatic actuator?
Single acting scotch yoke pneumatic actuator is a device designed to generate linear or rotational motion using compressed air. It operates on the scotch yoke mechanism, which converts the linear force of the air into rotational torque. Unlike double acting actuators, single acting actuators only use air pressure for motion in one direction; the return motion is usually achieved via a spring mechanism.
How does a single acting scotch yoke pneumatic actuator work?
The actuator works by supplying compressed air to one side of a piston within the actuator cylinder. This air pressure drives the piston, which is connected to a yoke via a slot. The yoke rotates as the piston moves, converting the linear motion into rotary motion. When the air supply is cut off, the spring mechanism returns the piston to its original position, thus returning the yoke to its starting point.
What are the advantages of using a single acting scotch yoke pneumatic actuator?
- Energy Efficiency: Utilises air pressure for motion in only one direction, reducing overall air consumption.
- Fail-Safe Operation: Equipped with a spring return mechanism that ensures the actuator returns to a safe position in the event of air supply failure.
- Compact Design: Generally more compact due to the single chamber for air, making it suitable for applications with space constraints.
- High Torque Output: The scotch yoke mechanism generates high torque, making it suitable for heavy-duty applications.
How do I select the right single acting scotch yoke pneumatic actuator for my application?
- When selecting an actuator, consider the following factors:
Torque Requirements: Determine the torque needed for your specific application. - Operating Pressure: Ensure the actuator can handle the air pressure levels in your system.
- Temperature Range: Verify that the actuator can operate within the temperature conditions of your application.
- Environmental Conditions: Consider factors like humidity, dust, and corrosive elements that might affect the actuator’s performance.
- Mounting and Space Constraints: Ensure the actuator fits within the available space and can be mounted appropriately.
