Fisher 685 series piston actuators provide medium to high thrust output for a variety of medium to very large Fisher sliding-stem valves, including the easy-e™, HP, EH, FB, and 461 valves. The double-acting design of the actuator results in stiff, precise positioning. Spring-return constructions are also available and offer a fail open or closed mode of operation when paired with a valve.
Power Your Process with Unmatched Reliability
The Fisher 685 Actuator is engineered for durability and precision in demanding industrial valve automation. Featuring a robust rack and piston design, this pneumatic actuator delivers high torque output in a compact, lightweight package, making it the ideal choice for quarter-turn applications like ball, plug, and butterfly valves.
Built to withstand harsh environments, the 685 actuator offers long service life with minimal maintenance. Its versatile design includes adjustable travel stops, a corrosion-resistant epoxy coating, and a wide range of spring options for fail-safe operation. Whether you’re in chemical processing, oil & gas, power generation, or water treatment, trust the Fisher 685 to provide consistent and dependable performance for your most critical control loops.
Key Advantages:
Robust Rack & Piston Design: Ensures high torque output and reliable operation for thousands of cycles.
Compact and Lightweight: Saves space and simplifies installation compared to bulkier actuator designs.
Durable Construction: Features a hard-coated aluminum body for excellent corrosion resistance and longevity.
Double-Acting & Spring-Return Options: Available in both double-acting and a wide variety of spring-return models for fail-safe requirements.
Global Compliance: Meets major international standards like ISO 5211, NAMUR, ATEX, and PED for easy integration and global acceptance.
| Feature | Description |
|---|---|
| Product Line | Fisher 685 Actuator |
| Type | Pneumatic Rack and Piston |
| Action | Double-Acting (DA) and Spring-Return (SR) |
| Mounting | ISO 5211 mounting pad; Direct mount to Fisher Vee-Ball, butterfly valves, and other quarter-turn valves. |
| Body Material | Hard Coated Aluminum |
| Spring Material | Epoxy-Coated Carbon Steel (for SR models) |
| Temperature Range | Standard: -20°F to 180°F (-29°C to 82°C) Low Temp: -40°F to 180°F (-40°C to 82°C) |
| Supply Pressure | 40 to 120 psi (2.8 to 8.3 bar) |
| Standards | ISO 5211, NAMUR, ATEX, PED, CE |
| Accessories | Limit switches, solenoid valves, positioners, pressure regulators, and more (mount per NAMUR standards). |
The Fisher 685 Actuator is available in multiple sizes to match your torque requirements. Below is a summary of the standard model configurations.
| Actuator Size | Double-Acting Torque (lb-in @ 80 psi) | Spring-Return Torque (lb-in @ 80 psi) | Approx. Weight (lbs) |
|---|---|---|---|
| 685-30 | 330 | 200 | 4.4 |
| 685-40 | 660 | 470 | 7.5 |
| 685-50 | 1,320 | 940 | 11.0 |
| 685-60 | 2,650 | 1,880 | 19.8 |
| 685-70 | 5,300 | 3,760 | 33.0 |
| 685-80 | 10,600 | 7,530 | 55.0 |
Notes:
Torque values are approximate and can vary based on supply pressure. Consult datasheets for precise calculations.
Spring-Return models are available with different spring ranges (e.g., 3-15 psi, 6-30 psi, etc.) to provide fail-open or fail-close action.
If you have any questions or are unsure about the correct Fisher 685 model for your application, please do not hesitate to contact the Kateteco sales team. Our technical experts are ready to assist you in selecting the perfect actuator for your needs.
Contact Kateteco Sales Today!
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KateTeco (Tianjin) Technology Co., Ltd. serves as an outstanding partner in the field of industrial fluid automation, specializing in the introduction and integration of high-end valves and instruments. We are committed to providing customers with safe, reliable, and intelligent system solutions. By leveraging global leading product resources and supported by systematic professional training and on-site technical assistance from Emerson’s experienced engineers, we ensure that customers can respond promptly and accurately to technical challenges.
With full lifecycle services covering installation, commissioning, operation, maintenance, and replacement, we deliver a true one-stop service system. This allows our customers to enjoy seamless, efficient, and high-quality assurance, supporting enterprises in achieving stable operation and continuous upgrades.
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