Johnson Controls V47AC-40 Valve

The Johnson Controls V47AC-40 is a heavy-duty, direct-acting temperature actuated water regulating valve designed for precision cooling control in HVACR condensers and processing equipment. This 3/4" NPT cast brass valve maintains optimal refrigerant head pressure by modulating water flow based on sensed temperature, effectively preventing high-pressure trips in water-cooled systems. Featuring a cross-ambient point range of 40 to 85 degrees Fahrenheit, it ensures reliable operation across fluctuating environmental conditions. The assembly includes a 6-foot capillary and a Style 4 sensing bulb—measuring 11/16" in diameter and 10" in length—with a 1/2" NPT external fitting for secure immersion sensing. Engineered for non-corrosive refrigerants, this valve is a drop-in replacement for the V47AC-40C, utilizing a balanced plug design to provide high-flow capacity with minimal pressure drop. The V47 series regulator is a staple for technicians requiring robust commercial refrigeration temperature control and consistent thermal expansion management in hydraulic circuits.

Key Benefits for Contractors

• Precise Modulation: The direct-acting design provides immediate response to temperature shifts, stabilizing condenser water flow rates.
• Durable Construction: High-grade cast brass body and stainless steel internal components resist scaling and wear in demanding mechanical rooms.
• Cross-Ambient Versatility: The V47AC-40 maintains setpoint accuracy even when the ambient temperature at the valve body exceeds the bulb temperature.
• Field Serviceable: Designed for standard 3/4 inch pipe threading, allowing for straightforward installation or replacement in existing HVAC cooling loops.
• Optimized Sensing: The large Style 4 bulb provides increased surface area for faster thermal transfer and more accurate refrigerant head pressure regulation.

Common Installation and Technical Questions

Is the V47AC-40 compatible with corrosive water sources?
This valve is constructed with cast brass and is suitable for standard open or closed-loop cooling towers and city water. For high-corrosivity brine or sea water applications, specialized alloys are typically required.

Can this valve be used for heating applications?
No, as a direct-acting valve, it opens on a temperature rise. For heating applications that require the valve to close on a temperature rise, a reverse-acting V47 series model should be selected.

What is the difference between the V47AC-40 and V47AC-40C?
These units are functionally and physically identical; the "C" suffix generally denotes a bulk or commercial packaging designation used in specific distribution channels.

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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.