V48AF-2C Johnson Controls Water Regulating Valve

Overview

The Johnson Controls V48AF-2C is a heavy-duty, pressure-actuated three-way water regulating valve designed specifically for large-scale condensing units cooled by atmospheric or forced draft cooling towers. It senses compressor head pressure to modulate water flow, directing it to the condenser, bypassing it, or flowing to both to maintain a stable and correct refrigerant head pressure. The pressure-balanced design employs rubber sealing diaphragms that insulate the internal spring and guiding components from the water, protecting them from sedimentation and corrosion while rendering the valve independent of liquid inlet pressure changes.

Features

• Pressure-balanced design ensures setpoint and performance are unaffected by liquid inlet pressure or severe hydraulic shock waves.
• Three-way configuration functions as a mixing or diverting valve to accommodate varied piping arrangements.
• Modulates water flow smoothly due to the free movement of all internal parts and provides quick opening characteristics.
• Easy manual flushing mechanism allows for debris clearing by lifting the lower spring guide without altering the valve pressure adjustments.
• Durable construction features a one-piece cast iron body with a corrosion-resistant, rust-resisting finish and brass internal trim.

Specifications

• Valve Size: 1-1/2 inches
• Connection Type: NPT Threaded ports
• Pressure Connection Style: Style 5 (1/4-inch external SAE male flare fitting)
• Opening Point Adjustment Range: 145 to 190 psi (1,000 to 1,310 kPa)
• Factory-Set Opening Point: 165 psi (Port 1 to Port 2)
• Maximum Bellows Overpressure: 320 psig (2,206 kPa)
• Maximum Water Supply Pressure: 150 psig (1,034 kPa)
• Compatible Refrigerants: Non-corrosive types (e.g., R-22, R-404A)
• Materials: Cast iron body, brass extension sleeve, disc, stud, and disc holder

Applications

• Designed for single or multiple condenser hook-ups connected to cooling tower systems.
• Regulates cooling water delivery in commercial refrigeration and HVAC condensing units to maintain precise system head pressure.
• Ideal for systems requiring a continuous, balanced water flow back to the cooling tower to maintain nozzle efficiency and reduce tower maintenance.