Johnson Controls V48AF-2 Regulating Valve

The Johnson Controls V48AF-2 is a heavy-duty three-way pressure-actuated water regulating valve designed specifically for large-scale condensing units. Built with a rugged cast iron body and a 1-1/2 inch NPT connection, this valve is engineered to maintain stable refrigerant head pressure by modulating water flow between the condenser and the bypass line. It features a normally closed side range of 145 to 190 PSI, making it ideal for high-pressure systems utilizing R-22 or similar non-corrosive refrigerants. The integration of a Style 5 pressure element with a 1/4-inch external flare fitting ensures accurate sensing and rapid response to load variations. This pressure balanced design protects the internal assembly from hydraulic shock and fluctuating inlet water pressures, ensuring consistent condenser pressure control in both atmospheric and forced-draft cooling tower applications. Contractors rely on the V48AF-2 for its high flow capacity, rated at 18.7 Cv, providing reliable performance in demanding commercial HVACR environments.

Key Benefits:

• Precision Head Pressure Control: Maintains optimal compressor operation by precisely modulating water flow based on real-time refrigerant pressure.
• Rugged Construction: The cast iron water valve body provides the durability required for industrial cooling tower environments.
• Pressure Balanced Operation: Eliminates performance drifts caused by varying water supply pressures, ensuring the opening point range remains accurate.
• Efficient Cooling Tower Integration: The three-way design permits continuous flow to the tower, reducing maintenance on nozzles and wetting surfaces.
• Technical Versatility: Can be utilized as either a mixing or diverting valve depending on the system piping configuration.

Common Questions:

What is the maximum water supply pressure for the V48AF-2?
This valve is rated for a maximum water supply pressure of 150 psig, ensuring it can handle standard commercial tower pumping systems.

How do I adjust the opening point on this regulating valve?
The opening point adjustment is handled via the integrated adjustment screw, which allows you to set the pressure between 145 and 190 PSI to match specific system requirements.

Is this valve compatible with seawater applications?
No, the standard V48AF-2 features a cast iron body and is intended for non-corrosive water systems. For saltwater or ammonia applications, specific power elements and body materials are required.

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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.