Schneider Electric (Barber Colman) AV-391 Linkage

The Schneider Electric AV-391 (formerly Barber-Colman) is a heavy-duty valve linkage kit designed to interface gear train actuators with specific globe valve bodies. Engineer-rated for a 150 lb stem force, this linkage provides the mechanical advantage and stroke precision necessary for modulating or two-position control in hydronic systems. This kit is the standard solution for mounting Forta, MA51, MP52, and MPR-5xxx series actuators. It is fully compatible with 1/2" to 2" VB-7xxx series and 1/2" to 1-1/4" VB-9xxx series valve bodies. The AV-391 linkage ensures a secure stem connection and proper alignment, preventing binding and premature packing wear. When replacing older Barber-Colman HVAC components, this assembly facilitates a seamless field retrofit, maintaining the seat pressure required for tight valve shut-off and reliable fluid flow regulation in commercial air handling and boiler applications.

• Application Versatility: Specifically engineered for VB-7000 and VB-9000 valve series, supporting both two-way and three-way configurations.
• Durable Construction: Built to handle 150 lb-force requirements, ensuring consistent stem travel even in high-differential pressure environments.
• Complete Linkage Kit: Includes all necessary hardware for a full field installation, reducing downtime and eliminating the need for specialized machining.
• Precise Actuation: Designed to translate rotary motion from gear train drive motors into linear stem movement with minimal hysteresis.

Common Questions

Which actuators are compatible with the AV-391 linkage?
This linkage is primarily used with Schneider Electric and Barber-Colman gear train actuators, including the MA-5100, MP-5200, and MPR-5000 series, as well as several Forta electronic actuators using appropriate adapters.

Can the AV-391 be used on 2-1/2" valves?
No, the AV-391 is limited to a maximum of 2" on VB-7xxx bodies and 1-1/4" on VB-9xxx bodies. Larger valve sizes typically require the AV-396 or high-force linkage series.

Does this kit include the valve or the actuator?
The AV-391 is a hardware linkage kit only. It serves as the mechanical bridge between the valve body and the actuator motor; those components must be purchased separately.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.