Actuator selection should begin with the complete valve operating condition—not just the valve size. A control valve package must generate sufficient force or torque through the required stroke while maintaining the intended control accuracy, shutoff performance and safety position.
1. Define the valve duty before selecting the actuator
Valve operating force
For globe, gate and linear control valves, confirm required thrust through the travel range. For rotary valves, confirm break torque, running torque and seating torque.
Control requirement
Identify on-off open/close service or modulating/regulating service. Modulating projects should state the required signal and positioning accuracy.
Safety position
Specify the required action on loss of air or electrical supply: fail closed, fail open, fail in place, or another approved project condition.
2. Electric vs. pneumatic control valve actuation
| Selection point | Electric actuator | Pneumatic actuator |
|---|---|---|
| Available utility | Requires compatible voltage, wiring and electrical protection. | Requires clean, stable instrument air at the specified pressure. |
| Control signal | Common options include 4–20 mA, 0–10 V, digital commands and feedback outputs. | Often paired with a positioner for 4–20 mA control; solenoid valves are used for on-off duty. |
| Fail action | Confirm whether fail-in-place, battery/energy storage, or another engineered function is required. | Spring-return designs can provide fail-open or fail-closed action when air is lost. |
| Operating duty | Check duty cycle, starts per hour, heat dissipation and manual override. | Check air consumption, cycling rate, positioner and air treatment requirements. |
3. Signals, feedback and site integration
For regulating service, state whether the plant uses 4–20 mA, 0–10 V, a fieldbus system or a site-specific protocol. Also specify position feedback, open/close limit switches, local controls, manual override, enclosure rating and cable entry requirements. These details allow the valve, actuator and control system to be quoted as a compatible package.
4. Customer-specified actuator brands
For projects that specify Rotork, AUMA or SAMSON equipment, Jinkon can review the requested actuator model and provide or replace a compatible valve-actuator package subject to engineering confirmation and availability. Send the existing actuator nameplate, mounting interface, required travel, torque or thrust, supply, signal and feedback requirement before selection.
Rotork, AUMA and SAMSON are third-party trademarks. Jinkon is not affiliated with or an authorized distributor for those brands unless expressly confirmed in writing for a specific project.
5. RFQ checklist
- Valve type, nominal size and connection standard
- Medium, operating pressure, temperature and flow direction
- Valve drawing, data sheet or existing actuator nameplate
- On-off or modulating function; required signal and feedback
- Supply voltage or available air pressure
- Fail action, enclosure rating, certifications, quantity and delivery destination
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