Johnson Controls V48AM-2 Regulating Valve

The Johnson Controls V48AM-2 is a heavy-duty, 3-way pressure actuated water regulating valve designed specifically for condensing units utilizing atmospheric or forced draft cooling towers. Featuring a 1 1/4" union sweat connection, this valve maintains precise refrigerant head pressure by modulating water flow between the condenser and the bypass line. This three-way water valve ensures consistent condensing temperatures and constant water volume to the tower, preventing nozzle scaling and improving overall system efficiency. The normally closed side offers a field-adjustable opening point range of 145 to 190 PSI, providing the flexibility needed for high-pressure refrigerants like R-410A. Its cast brass construction and pressure-balanced design protect the internal bellows and mechanics from sudden hydraulic shock and sedimentation. The Style 46 pressure element includes a 30" capillary with 1/4" flare nut for stable sensing, even in high-vibration commercial HVAC environments. For maximum reliability in hydronic systems, incorporate this modulating valve to bypass the condenser during low-load periods or low ambient conditions.

• Optimized Head Pressure: Automates water distribution to maintain refrigerant head pressure during varying ambient temperatures.
• Internal Protection: A pressure-balanced design isolates the range spring and internal guides from the water stream, preventing corrosion.
• Serviceability: Features an easy manual flushing mechanism that allows debris removal without disturbing the pressure setpoint.
• System Efficiency: Sustains continuous water flow to the cooling tower, minimizing nozzle maintenance and improving pump performance.
• Durable Construction: High-grade cast brass body with Nylon-reinforced Buna-N diaphragms ensures longevity in non-corrosive refrigerant applications.

• What is the maximum water pressure for this valve? The Johnson Controls V48AM-2 is rated for a maximum water supply pressure of 150 psig.
• How do I adjust the opening point? Use the range adjustment screw on top of the valve; turning clockwise lowers the opening point pressure.
• Can this be used for salt water? No, this is a commercial water valve for non-corrosive fluids. Use maritime-specific models for seawater applications.

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