Johnson Controls VB-3966-1 Valve Body

The Johnson Controls VB-3966-1 is a robust 1/2 inch flare valve body engineered for precise control in HVAC hydronic systems. Designed for hot and cold water service, this two-way valve features a Push Down to Open (PDTO) action and a 1.7 Cv flow coefficient, making it ideal for terminal units like fan coils and reheat coils. The equal percentage flow characteristic ensures stable control throughout the stroke, compensating for the non-linear heat transfer properties of water-to-air heat exchangers. With a 1/2 inch stroke and a 1/4 inch stem diameter, it integrates seamlessly with standard JCI pneumatic or electric actuators. Built to withstand commercial duty cycles, the flare connections provide a reliable mechanical seal, reducing leak paths in tight mechanical closets. This HVAC control valve is a dependable choice for contractors prioritizing hydronic system balancing and long-term proportional control performance in demanding environments.

• Precision Flow Control: The 1.7 Cv rating and equal percentage plug design provide accurate modulation for consistent temperature discharge.
• Durable Construction: Engineered for both chilled and hot water applications, ensuring versatility across seasonal changeovers.
• Contractor-Friendly Installation: The 1/2" flare fittings allow for secure connections without the need for soldering in restricted spaces.
• Actuator Compatibility: Designed for standard 1/4" stem interfaces, facilitating easy pairing with various Johnson Controls valve actuators.

Common Technical Questions

What is the maximum fluid temperature rating for this valve body?
This valve is typically rated for water temperatures ranging from 35°F to 250°F, depending on the specific actuator and packing assembly utilized.

Can this valve be used for steam applications?
The VB-3966-1 is specifically rated for hot and cold water service; using it for steam may exceed the sealing capabilities of the internal components.

Does this valve require a specific mounting orientation?
While it can be mounted in multiple positions, it is recommended to install the valve with the actuator above the horizontal plane to prevent condensate from damaging the motor or diaphragm.

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.