Johnson Controls V46AT-2 Regulating Valve

The Johnson Controls V46AT-2 Regulating Valve is a heavy-duty, direct-acting control solution engineered for maintaining precise head pressure in large-scale water-cooled condensers. Featuring a 2 1/2" ASME four-hole flange connection, this pressure-actuated water regulating valve is built from high-grade cast iron to withstand demanding commercial environments. It operates with a 160 to 260 PSI opening point range, specifically designed for systems utilizing non-corrosive refrigerants such as R-22 or R-404A. The Style 5 pressure element includes a 1/4" external flare fitting, providing a reliable sense point for the refrigeration circuit. Its pressure-balanced design ensures that the setpoint remains stable regardless of fluctuations in water inlet pressure, preventing common issues like water hammer or chatter. This valve is a direct replacement for the V46AT-2C model, offering a robust "take-apart" construction that allows for internal maintenance without removing the body from the piping or pumping down the system.

• Precise Head Pressure Control: Direct-acting modulation opens on pressure increase to maintain optimal condenser performance.
• Field-Serviceable Design: The take-apart construction permits seat cleaning and parts replacement while the valve remains in-line.
• Stable Setpoints: Integrated rubber sealing diaphragms balance the valve port area against sudden surges in supply water pressure.
• Corrosion Resistance: Internal components in contact with water are crafted from non-corrosive materials to extend service life in commercial HVACR loops.
• Manual Flushing: Accessible range spring allows for manual flushing to clear sediment without altering the calibrated pressure settings.

What refrigerants are compatible with the V46AT-2?
This valve is designed for non-corrosive refrigerants. It is commonly used in high-pressure applications with R-22, R-404A, and R-502. For ammonia (NH3) systems, a specific ammonia-compatible power element must be used.

How do I adjust the opening point on this valve?
The opening point is set using the range adjustment screw located at the top of the valve. Using a standard service wrench, you can calibrate the 160 to 260 PSI range to match your system’s required head pressure.

Can this valve be mounted in any orientation?
For optimal performance and to ensure proper drainage of oil and refrigerant away from the bellows, it is recommended to mount the valve vertically with the adjustment screw on top and the pressure connection at the bottom.

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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.