Johnson Controls V48AD-2 Regulating Valve

The Johnson Controls V48AD-2 is a heavy-duty, 3-way pressure-actuated water regulating valve designed for high-demand commercial refrigeration and HVAC systems. Built with a rugged cast iron body and a 1" NPT connection, this direct-acting valve is engineered specifically for condensing units cooled by atmospheric or forced draft cooling towers. Its primary function is to maintain stable refrigerant head pressure by modulating water flow, either directing it to the condenser or bypassing it to ensure optimal system performance in fluctuating ambient conditions.

This model features a normally closed side with a precise opening point range of 145 to 190 PSI, making it ideal for systems utilizing R-22 or other non-corrosive refrigerants. The Style 45 pressure element includes a 30" capillary with a 1/4" flare nut for versatile installation. By allowing continuous water flow to the tower even when the condenser does not require cooling, the V48AD-2 prevents nozzle fouling and maintains tower efficiency. Its pressure-balanced design ensures that performance remains consistent regardless of sudden fluctuations in water supply pressure.

• System Stability: Maintains consistent head pressure to prevent system "cycling" and cooling capacity loss.
• Corrosion Resistance: Durable cast iron construction with aluminum bronze internal seating for long-term reliability in water loop applications.
• Efficiency: Directs water to the condenser, bypass, or both to maximize cooling tower utility.
• Ease of Service: Features a manual flushing mechanism that does not disturb the pressure setpoint during maintenance.
• High Pressure Capability: Rated for a maximum bellows overpressure of 320 PSI for added safety in high-pressure applications.

Common Questions

Can this valve be used for salt water or corrosive fluids?
No, the standard V48AD-2 is designed for use with non-corrosive refrigerants and standard cooling tower water. For sea-water applications, a specific maritime-grade version is required.

What happens if the head pressure exceeds the setpoint?
As the compressor head pressure increases above the opening point, the valve modulates to allow more water flow through the condenser to increase heat rejection and bring the pressure back to the desired range.

Is the capillary tube replaceable?
Yes, the Style 45 sensing element is a field-replaceable component, allowing for repairs without necessarily replacing the entire valve body.

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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.