Heavy Duty Scotch Yoke TypePneumatic Actuator single Acting

Description

Feature：

This Autorun single-acting Scotch Yoke pneumatic actuator delivers 600–100,000Nm fail-safe torque for 90° valves (ball, butterfly, plug). It operates at 0.3–0.7MPa, with temperature ranges from -20°C to +150°C (custom low-temp available). The spring-return design guarantees safe valve positioning on air loss, making it ideal for critical emergency shutdown applications.

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1. Application Scenarios

This single-acting Scotch Yoke actuator is designed for on/off or proportional control of 90° quarter-turn valves in demanding industrial environments. Typical applications include:

Oil & Gas Pipelines: Emergency shut-off for high-pressure ball valves and plug valves.

Chemical & Refining: Safe operation of large-bore butterfly valves in corrosive, high-temperature media.

Power & Metallurgy: Control of flue gas and pulverized coal pipeline valves.

Water Treatment: On/off actuation for large-diameter butterfly valves.

Cryogenic & LNG: Specialized low-temperature service with compatible sealing materials.

2. Key Selection Parameters

Parameter	Specification
Rotation Angle	0° ~ 90°
Output Torque (Spring Return)	600 ~ 100,000 Nm
Operating Pressure (Pneumatic)	0.3 ~ 0.7 MPa
Operating Temperature (Standard)	-20°C ~ +80°C
Operating Temperature (High Temp)	-15°C ~ +150°C
Connection Standard	ISO 5211 flange interface, NAMUR accessory mounting
Material	Cylinder: Carbon steel / Ductile iron; Piston/Yoke: Alloy steel; Seals: FKM / PTFE
Protection Rating	IP67 (IP68 optional), ATEX/IECEX explosion-proof certification available

3. FAQ

Q: How to extend service life?A: Use clean, dry air (filter ≤5μm), replace seals regularly, avoid over-torque operation, and use temperature-appropriate lubricants.

Q: Is it compatible with non-90° valves?A: Standard stroke is 0°~90°; custom stroke angles (e.g., 0°~120°) are available upon request.

Q: What hazardous areas is it suitable for?A: Explosion-proof models with ATEX II 2G Ex d IIC T6 certification are approved for Zone 1/2 explosive gas environments.

4. Compatible Valves

Ball Valves: Trunnion-mounted, floating, and metal-seated ball valves.

Butterfly Valves: Triple-offset, double-offset, and large-bore ventilation butterfly valves.

Plug Valves: Oilfield plug valves and high-pressure 3-way plug valves.

Other 90° Valves: Dampers, louver valves, and special rotary valves.