Home>>Pneumatic Actuator>>Scotch Yoke Pneumatic Actuator
JSW Scotch Yoke Pneumatic Actuator - High Torque Modular Series
Product Overview
Specifically, the JSW scotch yoke pneumatic actuator is a high‑performance industrial actuating device designed for 90‑degree rotating mechanisms such as ball valves, butterfly valves, and plug valves. It adopts a unique scotch yoke structure, which delivers exceptional torque output — double‑acting models can reach over 240,000 N·m, while spring‑return models exceed 110,000 N·m, making it ideal for high‑load industrial scenarios. Additionally, the product features a modular design: the center body offers six sizes, with pneumatic cylinders and spring cartridges attachable to either side, supporting ESD (emergency shut‑down) applications. A reliable manual override facility (including gear reducer, de‑clutch gear box, and hydraulic options) ensures operational flexibility in special situations. Manufactured from high‑quality materials such as aluminum alloy, stainless steel, and engineering plastics, this scotch yoke pneumatic actuator boasts excellent corrosion resistance and wear resistance, withstanding harsh environments like high temperature (–15 ℃ to +150 ℃) and low temperature (–40 ℃ to +80 ℃). Furthermore, it fully complies with ISO 5211 and NAMUR standards, ensuring strong compatibility with global industrial equipment. For more product options, you can also explore our pneumatic actuator series and learn about our manufacturing facility.
What Is a Scotch Yoke Pneumatic Actuator?
A scotch yoke pneumatic actuator is an actuating device that uses pneumatic pressure to drive the opening, closing, or regulation of valves. The scotch yoke mechanism converts the linear movement of a pneumatic cylinder into the rotary motion necessary for valve operation. This design is particularly suitable for valves with high start or end torque requirements — such as large‑diameter ball valves and butterfly valves — where peak torque is needed at the beginning and end of the stroke. Notably, the scotch yoke principle is characterised by its high torque when required — at the beginning and end of each operation, which increases safety, especially in applications where a valve remains stationary throughout long periods.
Double Acting vs. Spring Return (Single Acting)
Pneumatic scotch yoke actuators are available in two configurations: double acting and spring return (single acting). In double‑acting scotch yoke actuators, the switching action of the actuator is driven by compressed air in both directions — air pressure controls both opening and closing strokes. In spring return (single acting) scotch yoke actuators, the switch action is driven by the air source only when turning on; springs return the actuator to its original position when air supply is cut off. Spring return models are commonly specified for fail‑safe applications in the oil, gas, and petrochemical industries, where valves must automatically return to a safe position upon loss of instrument air.
JSW Actuator Core Advantages
JSW Actuator Core Advantages
1.Super High Torque Output
The scotch yoke structure provides superior torque performance. Double‑acting models achieve torque output up to 240,000 N·m, making this scotch yoke pneumatic actuator suitable for high‑load valve actuation in demanding industrial environments.
2.Modular Construction
Interchangeable center body, cylinders, and spring cartridges enable quick assembly and delivery. This modular design also supports customized ESD solutions, allowing rapid configuration changes without extensive re‑engineering.
3.Multi‑Environment Adaptability
The scotch yoke pneumatic actuator operates across a wide temperature range from –40 ℃ to +150 ℃. Optional stainless steel materials are available for corrosion‑resistant requirements in offshore, chemical, and marine applications.
4.Reliable Manual Override
Multiple override options — including gear reducer, de‑clutch gearbox, and hydraulic mechanisms — ensure operation under abnormal air supply conditions. This feature is particularly valuable for emergency shutdown systems and maintenance scenarios.
5.International Standard Compliance
This scotch yoke pneumatic actuator conforms to ISO 5211 and NAMUR standards, ensuring compatibility with solenoid valves, limit switch boxes, and positioners from leading global manufacturers.
Application
Oil & Gas Industry
For pipeline valves and ESD systems, with high torque to handle high-pressure media control.
Chemical Industry
Resists corrosive environments, suitable for reaction vessel and pipeline valve actuation.
Power Generation
Controls turbine governors and boiler dampers, adapting to high-temperature working conditions.
Water Treatment
Drives large-diameter butterfly valves and gate valves, ensuring stable flow regulation.
Marine & Offshore
Optional stainless steel material resists saltwater corrosion, for shipboard and offshore platform valves.
General Industrial ESD
Emergency shut-down applications in petrochemical, pharmaceutical, and other safety-critical industries.
Technical Specifications
FAQ
| Questions | Answers |
|---|---|
| What is the advantage of scotch yoke structure compared to rack and pinion? | Scotch yoke structure provides higher torque output and more stable force transmission, ideal for high-load and large-diameter valve applications; rack and pinion is more compact for general-load scenarios. |
| Does JSW scotch yoke actuator support ESD applications? | Yes. It offers spring cartridges for emergency shut-down, with modular design enabling quick integration into ESD systems. |
| What manual override options are available? | Options include open/enclosed screw gear reducers, de-clutch override gear boxes, and hydraulic override solutions, meeting diverse operational needs. |
| What standards do these actuators comply with? | They conform to ISO 5211 and NAMUR standards, ensuring compatibility with global valves, positioners, and limit switch boxes. |
Spanish 
English 
Russian 
Portuguese