The Barber Colman MK-4821 is a pneumatic valve actuator designed for precise modulating control of 1½” to 2″ VB-9xxx series valves in HVAC and industrial systems. Featuring an 11 in² diaphragm and operating within an 8 to 13 psig spring range, it ensures reliable valve positioning in response to pneumatic control signals.
Technical Specifications
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Model: MK-4821
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Type: Pneumatic valve actuator
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Diaphragm Area: 11 in² (71 cm²)
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Spring Range: 8 to 13 psig
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Maximum Air Pressure: 30 psig
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Control Signal: Proportional
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Spring Return: Yes; retracts actuator shaft and raises valve stem upon air pressure loss
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Enclosure Rating: NEMA Type 1
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Compatible Valves: 1½” to 2″ VB-9xxx series
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Condition: New
Key Features
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Provides precise modulating control for compatible valves
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Spring return mechanism ensures fail-safe operation during air pressure loss
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Compact design suitable for various installations
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Designed for 8 to 13 psig control signals
Compatible Applications
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HVAC systems requiring modulating valve control
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Industrial processes involving fluid regulation
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Systems utilizing VB-9xxx series valves
Installation & Maintenance Notes
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Ensure proper alignment when mounting to compatible valves
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Verify pneumatic connections are secure and leak-free
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Regularly inspect actuator for signs of wear or damage
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Follow manufacturer guidelines for maintenance procedures
We ship this product worldwide! Delivery is normally stock.
Request a Quote now or call us at 1-800-755-2883 for expert assistance