Honeywell ML7425A8018-E electric linear valve actuator specifications. 38mm stroke, 24V AC supply, spring return, 0-10V/2-10V input, 2-10V feedback, IP54 protection. For HVAC modulating control applications.

Honeywell ML7425A8018-E Electric Linear Valve Actuator

The Honeywell ML7425A8018-E​ is a spring return electric linear valve actuator​ from the ML7425A series, featuring 38mm stroke length, 24V AC power supply, and modulating control capability. This actuator is designed for HVAC (Heating, Ventilation, and Air Conditioning) applications, providing precise positioning control of Honeywell's standard valves. With 0-10V or 2-10V analog input signal, 2-10V position feedback output, and spring return function (actuator stem extends on power failure), it is suitable for modulating control applications requiring accurate valve positioning. The "8018" designation indicates 38mm stroke length and specific configuration, while "E" denotes the variant suffix.

Key Features

• Spring Return Function:​ Actuator stem extends on power failure (safety position)

• 38mm Stroke Length:​ Provides extended travel for larger valve applications

• Modulating Control:​ 0-10V or 2-10V analog input for precise positioning

• Position Feedback:​ 2-10V output signal for closed-loop control

• 24V AC Power Supply:​ Standard HVAC control voltage

• Manual Override:​ Manual operation knob for testing and maintenance

• Force-Limiting End Stops:​ Prevents damage to actuator and valve

• IP54 Protection:​ Dust and water splash resistant

• Direct/Reverse Action:​ Selectable via internal plug

• Corrosion-Resistant Design:​ Suitable for HVAC environments

Technical Specifications

Note: Specifications are based on Honeywell ML7425A series technical documentation and industry standards. The "ML7425A8018-E" model specifically indicates spring return type, 38mm stroke, and specific configuration. Actual specifications may vary slightly depending on production batch and regional variations.

Model Number Decoding (ML7425A8018-E)

• ML7425A:​ Series designation (ML7425A spring return electric linear actuator)

• 8018:​ Configuration code (80 = stroke length code, 18 = specific variant)

• E:​ Suffix (typically indicates electrical connection type or variant)

Note:​ The "8018" configuration code typically corresponds to 38mm stroke length and specific internal configuration. The "E" suffix may indicate specific electrical connection options or regional variant. For exact interpretation, consult Honeywell's official nomenclature guide.

Key Differences from Similar Models

Compared to other ML7425A series actuators:

• ML7425A8018-E:​ Spring return, 38mm stroke, specific configuration​ (this model)

• ML7425A3005:​ Spring return, 20mm stroke, different configuration

• ML7425A3014:​ Spring return, 20mm stroke, different power consumption

• ML7425B3004:​ Non-spring return, 20mm stroke

• ML7420A series:​ Different series with different characteristics

The 38mm stroke length​ provides longer travel compared to standard 20mm stroke models, suitable for larger valves or applications requiring greater positioning range. The spring return function​ ensures the actuator moves to a safe position (typically open or closed) in case of power failure.

Typical Applications

• HVAC Systems:​ Heating and cooling valve control

• Building Automation:​ Air handling unit (AHU) control

• Chilled Water Systems:​ Cooling coil valve modulation

• Hot Water Systems:​ Heating coil valve control

• Energy Management:​ Building energy optimization

• Process Control:​ Industrial HVAC applications

• Commercial Buildings:​ Office, retail, and institutional HVAC

Important Selection & Installation Notes

1. Power Supply:​ Requires 24V AC ±15% power supply. Ensure the transformer capacity is sufficient for the power consumption (12 VA).

2. Input Signal:​ Accepts 0-10V or 2-10V DC analog signal. The signal source should have output resistance ≤1 kΩ.

3. Stroke Length:​ 38mm stroke requires compatible valve with matching stroke length. Verify valve compatibility.

4. Spring Return:​ This is a spring return actuator. On power failure, the stem extends (factory setting). This can be reversed via internal selector plug.

5. Mounting:​ Direct coupling to valve stem. Ensure proper alignment and secure connection.

6. Temperature Limits:​ Do not operate outside -10°C to +50°C ambient temperature. Valve medium temperature can be up to 150°C.

7. Signal Failure:​ The position on signal failure is selectable (stem extended or retracted). Configure according to system requirements.

8. Manual Operation:​ Manual override is available via the knob. Only operate manually when power is disconnected.

9. Wiring:​ Follow proper wiring practices. Use appropriate cable glands and ensure IP54 protection is maintained.

10. Feedback Signal:​ The 2-10V position feedback can be used for monitoring or closed-loop control. Ensure the controller can accept this signal.

11. Direct/Reverse Action:​ The direction of movement relative to input signal can be reversed using the internal selector plug.

12. Maintenance:​ Regular inspection for proper operation is recommended. Check for smooth movement and proper sealing.

Note: For complete installation guidelines, dimensional drawings, and detailed technical data, consult the official Honeywell ML7425A Series Technical Manual​ or contact Honeywell technical support. Always verify the exact model number configuration with the manufacturer, as notation variations may occur in different documentation systems.