Barber Colman MK-6821 Pneumatic Valve Actuator (Schneider Electric)
The Barber Colman MK-6821, now part of Schneider Electric’s product line, is a pneumatic valve actuator designed for proportional control in HVAC systems. With a control spring range of 8 to 13 psig and an effective diaphragm area of 50 square inches, this actuator provides precise modulation of valve positions in heating and cooling applications.
The Barber Colman MK-6821 pneumatic valve actuator offers precise and reliable control for various HVAC applications, contributing to enhanced system performance and energy efficiency.
Technical Specifications
-
Model: MK-6821
-
Type: Pneumatic Valve Actuator
-
Control Signal: Proportional pneumatic
-
Control Spring Range: 8 to 13 psig
-
Effective Diaphragm Area: 50 sq. in. (323 cm²)
-
Stroke Length: 1 inch (25 mm)
-
Spring Action: Retracts actuator shaft and raises valve stem upon loss of air pressure
-
Maximum Air Pressure: 30 psig (207 kPa)
-
Air Connections: 1/8 inch FNPT
-
Ambient Temperature Limits: Operating: -20 to 220°F (-29 to 104°C); Shipping: -40 to 220°F (-40 to 104°C)
-
Mounting Orientation: Upright position with actuator head above the centerline of the valve body
-
Construction: Die-cast aluminum housing; replaceable beaded molded neoprene diaphragm
-
Dimensions: 7-3/4″ H x 10-1/2″ W x 10-1/2″ D (199 x 267 x 267 mm)
Key Features
-
Proportional Control: Enables accurate modulation of valve positions based on pneumatic control signals.
-
Spring-Return Mechanism: Ensures the actuator returns to a default position upon loss of air pressure, enhancing system safety.
-
Durable Construction: Die-cast aluminum housing and replaceable neoprene diaphragm ensure longevity and reliability.
-
Adjustable Start Point: Allows fine-tuning of the actuator’s response to control signals for optimal performance.
Compatible Components & Accessories
-
Valve Linkages: AV-495 for VB-9xxx series valves (2-1/2″ to 4″); AV-497 for VB-8xxx series valves (2-1/2″ to 6″)
-
Springs: PNV-245-108 (8 to 13 psig blue spring)
-
Diaphragm Replacement: PNV-202
-
Tools: TOOL-75 (Spring compression tool); TOOL-95 (Pneumatic calibration tool kit)
Industry Applications
-
HVAC Systems: Provides precise control of valve positions in heating, ventilation, and air conditioning systems.
-
Building Automation: Integrates into automated systems for efficient environmental control in commercial and industrial buildings.
-
Energy Management: Enhances energy efficiency by enabling accurate modulation of heating and cooling processes.
Installation & Maintenance Notes
-
Mounting: Install in an upright position with the actuator head above the centerline of the valve body to ensure proper operation.
-
Air Supply: Use clean, dry, oil-free air to maintain optimal performance and prevent contamination.
-
Adjustment: Utilize the adjustable start point feature to calibrate the actuator’s response to control signals as needed.
-
Inspection: Regularly inspect the diaphragm and other components for signs of wear or damage, and replace parts as necessary to maintain reliability.
We ship this product worldwide! Delivery is normally stock.
Request a Quote now or call us at 1-800-755-2883 for expert assistance