Description
Honeywell ML6421B1040 Non-Spring Return Direct Coupled Globe Valve Actuator
The Honeywell ML6421B1040 is a high-performance, non-spring return direct coupled globe valve actuator engineered for reliable modulating control in commercial HVAC hydronic systems. Designed to deliver precise valve positioning with a robust 405 Lbf stem force, this actuator is ideal for demanding heating and cooling applications where consistent, repeatable performance is critical.
Key Features
- Non-spring return design retains valve position on power loss
- Direct coupled mounting for fast, tool-free installation on compatible globe valves
- 24 VAC power supply for compatibility with standard commercial control systems
- 405 Lbf stem force for dependable actuation against high differential pressures
- SPDT (Single Pole Double Throw) auxiliary switch for end-of-travel signaling or interlocking
- Floating and two-position control modes for application flexibility
- 1½” (1.5 inch) stroke to match a wide range of globe valve body sizes
- 175-second nominal drive time for smooth, stable valve modulation
- Built-in manual operator allows valve positioning during commissioning or power outages
Operating Specifications
- Power Supply: 24 VAC
- Stem Force: 405 Lbf
- Control Type: SPDT, Floating / Two Position
- Stroke: 1½” (1.5″)
- Nominal Drive Time: 175 seconds
- Ambient Temperature Range: 14°F to 122°F (-10°C to 50°C)
- Relative Humidity Range: 5% to 95% RH (non-condensing)
- Manual Operator: Included
- Return Type: Non-Spring Return
Applications
- Commercial hydronic heating and cooling coil control
- Fan coil unit and air handling unit valve actuation
- Building automation and energy management systems
- Two-pipe and four-pipe chilled/hot water systems
Why Choose the Honeywell ML6421B1040?
With its combination of high stem force, flexible control modes, and a wide operating temperature range, the ML6421B1040 is built for long-term reliability in commercial environments. The integrated manual operator simplifies commissioning and emergency override, while the SPDT auxiliary switch enables easy integration with building automation systems. Its direct coupled design eliminates the need for linkage hardware, reducing installation time and potential points of failure.
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