Danfoss 065F-8961 Union Body

The Danfoss 065F-8961 is a high-performance VMT series union valve body engineered for precise flow regulation in hydronic heating and cooling applications. Featuring a 3/4 inch solder connection and a 5.9 Cv flow coefficient, this 2-way body is designed for seamless integration with Danfoss thermal or thermostatic actuators. The bronze construction ensures long-term resistance to corrosion and scaling in closed-loop systems. Contractors prefer the union connection design for its ease of installation and field serviceability in tight mechanical spaces. This valve body manages hot water and glycol mixtures with high efficiency, maintaining optimal pressure drop characteristics across the seat. Whether you are performing a Danfoss VMT valve replacement or a new system install, the 065F-8961 provides the hydronic flow control accuracy required to prevent short-cycling and ensure balanced heat distribution throughout the terminal units.

Key Technical Benefits

• Precise Flow Regulation: The 5.9 Cv rating allows for accurate throttling and high-capacity flow in residential and light commercial hydronic loops.
• Durable Bronze Housing: Resists dezincification and maintains structural integrity under fluctuating system temperatures and pressures.
• Universal Compatibility: Optimized for use with standard Danfoss actuators, facilitating easy HVAC valve body upgrades.
• Field-Serviceable Union Design: Simplifies the removal and maintenance of the valve without requiring extensive piping modifications.
• High Temperature Tolerance: Engineered to handle standard hydronic operating ranges while resisting common mineral buildup.

Common Technical Questions

What is the maximum operating pressure for the Danfoss 065F-8961?
This union body is typically rated for a maximum working pressure of 145 psi (10 bar), though it is essential to verify the specific actuator's close-off pressure rating for your application.

Can this valve be used for steam applications?
No, the VMT series is specifically designed for hot water and chilled water systems. Using this body in steam service will result in premature seal failure.

Is the flow direction reversible on the VMT 3/4 inch body?
Flow must follow the direction of the arrow cast into the valve body to ensure proper seating and to prevent hydraulic noise or water hammer during operation.

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.