Johnson Controls V47AC-3C Modulating Water Valve

The Johnson Controls V47AC-3C is a temperature-actuated, modulating water valve designed to regulate water flow in response to temperature changes. It is commonly used in heating applications to control water flow in systems such as heat exchangers, compressors, and industrial process equipment. The valve modulates open as the sensed temperature increases, providing smooth and proportional control.

Technical Specifications

  • Model: V47AC-3C
  • Pipe Size: 3/4 inch NPT
  • Temperature Range (Opening Point): 115°F to 180°F
  • Bulb Size: 11/16 inch diameter x 3-1/4 inch length
  • Standard Bypass Orifice Diameter: 0.062 inch
  • Capillary Length: 6 feet
  • Maximum Supply Water Pressure: 150 psi
  • Maximum Water Temperature: 170°F
  • Bulb Well (Ordered Separately): WEL18A-602R

Key Features

  • Modulates water flow in response to temperature changes, ensuring efficient thermal regulation
  • Direct-acting operation—valve opens as temperature increases
  • Corrosion-resistant materials for durability in heating environments
  • Designed for reliable operation in both commercial and industrial systems
  • Allows manual flushing to aid maintenance and prevent debris buildup

Repair and Replacement Parts

  • Seat Repair Kit: STT16A-601R
  • Replacement Sensing Element: SET29A-626R
  • Bulb Well: WEL18A-602R (ordered separately)

Industry Applications

  • Commercial and industrial HVAC systems
  • Heat exchangers and cooling water systems
  • Compressor jacket water cooling
  • Machinery and process temperature regulation

Installation & Maintenance Notes

  • Install with the bellows down and spring cage facing upward for proper function
  • Ensure correct orientation of the temperature bulb; if installed horizontally, the marked “TOP” side must face up
  • Do not expose the sensing bulb to temperatures exceeding 20°F above the rated maximum
  • Allow for clearance around the valve for accessibility and routine inspection
  • Manual flushing feature can be used during system commissioning or maintenance to remove debris

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