High‑Torque Scotch Yoke Type Pneumatic Actuator

Product Overview

This compact Scotch‑Yoke type pneumatic actuator is a spring‑return single‑acting unit for quarter‑turn valve automation. Its swing‑fork drive delivers a non‑linear torque curve, generating higher torque at the start and end of the 90‑degree stroke. The overall footprint is neat and compact, suitable for general‑purpose industrial ball valves, butterfly valves and plug‑valve installations with limited space.

The performance characteristics of this Scotch Yoke type pneumatic actuator are similar to those of comparable products from South Korea.

When compressed air is supplied, the piston compresses the internal springs and drives the valve to rotate to the open or closed position. Once air pressure fails, the built‑in return springs automatically reset the valve to its safe fail‑safe position, delivering essential safety protection for your pipeline system.

Key Features

1. Compact, space‑saving construction
Optimized for standard industrial automation applications where installation space is restricted. Light‑weight aluminum alloy housing with hard‑anodized anti‑corrosion surface treatment.

2. Non‑linear scotch‑yoke torque profile
The swing‑fork mechanism provides boosted torque at both ends of stroke, helping overcome valve seating friction and stick‑slip for smooth valve operation.

3. Fail‑safe spring‑return design (Single‑acting)
Pre‑loaded durable return springs guarantee automatic reset upon loss of air supply; you can select fail‑close or fail‑open configuration according to site safety requirements.

4. Standard international mounting interfaces
Fully compliant with ISO 5211 flange connection standards, also supporting NAMUR solenoid valve mounting. Easy fitting for limit switch boxes, valve positioners and other common valve automation accessories.

5. Visual top‑mounted position indicator
Clear status marker on top of the actuator allows field operators to quickly check whether the valve is in open or closed state on‑site.

6. Reliable factory quality test
Each single‑acting scotch‑yoke actuator undergoes strict leakage and stroke testing before shipment to ensure stable and repeatable operation.

Technical Specification Summary

• Action type: Single‑acting (Spring‑return, fail‑open / fail‑close)
• Rotation angle: Standard 90° quarter‑turn
• Working medium: Clean, dry compressed air
• Body material: Extruded aluminium alloy, hard‑anodized
• Protection rating: IP67
• Typical applications: Water‑treatment pipelines, light‑to‑medium process systems, general chemical and HVAC valve automation

Application Notes

This compact scotch‑yoke spring‑return actuator is an ideal choice for projects requiring fail‑safe protection without oversized heavy‑duty actuators. Custom spring torque configurations are available upon request.