Description
ASCO 8221G3 2-Way Normally Closed Solenoid Valve
The ASCO 8221G3 is a heavy-duty, pilot-operated solenoid valve engineered for reliable water control in commercial and industrial HVAC applications. Featuring a 2-way, normally closed configuration, this valve remains closed when de-energized and opens fully upon receiving a 120VAC signal — providing fail-safe shutoff for water lines. Its slow-closing design minimizes water hammer and pressure surges, protecting downstream equipment and piping systems.
Key Features
- 2-way, normally closed (N/C) operation — valve closes automatically when power is removed
- Pilot-operated design for efficient, low-power actuation across the full pressure range
- Slow-closing action reduces water hammer and system stress
- 1/2″ NPT pipe connection for easy inline installation
- 3.5 Cv flow coefficient for optimized water flow performance
- Operating pressure range: 5–150 PSI
- Coil voltage: 120VAC
- Brass body construction for corrosion resistance and long service life
- NBR (Buna-N) seals compatible with water and many general-purpose fluids
- NEMA 4 enclosure rating — suitable for indoor and outdoor use, protected against splashing water and windblown rain
Specifications
- Brand: ASCO
- Model / SKU: 8221G3
- Valve Type: 2-Way Solenoid Valve
- Operation: Normally Closed (N/C), Pilot Operated
- Closing Action: Slow Closing
- Port Size: 1/2″ NPT
- Cv (Flow Coefficient): 3.5
- Pressure Range: 5–150 PSI
- Coil Voltage: 120VAC
- Body Material: Brass
- Seal Material: NBR (Buna-N)
- Enclosure Rating: NEMA 4
- Media: Water
Application
The ASCO 8221G3 is ideal for water shutoff and control in HVAC systems, boiler feed lines, cooling towers, irrigation, and other water-handling applications where a dependable, electrically actuated valve is required. The NEMA 4 enclosure makes it suitable for both indoor mechanical rooms and outdoor installations exposed to the elements.
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