Description
ASCO 8221G3HW 2-Way Normally Closed Solenoid Valve Overview
The ASCO 8221G3HW is a heavy-duty, pilot-operated solenoid valve engineered for reliable hot water flow control in demanding HVAC and hydronic applications. Featuring a 2-way, normally closed configuration, this valve remains closed when de-energized and opens upon receiving a 120VAC signal — providing fail-safe shutoff when power is interrupted. The slow-closing design minimizes water hammer, protecting piping systems and connected equipment.
Key Features
- 2-Way, Normally Closed (N/C) operation — valve closes automatically when de-energized
- Pilot-operated, slow-closing design reduces water hammer in hot water systems
- 1/2″ NPT pipe connection for straightforward installation
- 120VAC coil voltage for compatibility with standard commercial control circuits
- Flow coefficient (Cv) of 3.5 for efficient flow performance
- Operating pressure range: 5–150 PSI
- Brass body construction for corrosion resistance and durability
- NBR (Buna-N) seals rated for hot water service
- NEMA 4X enclosure rating — suitable for indoor and outdoor use, resistant to washdown, corrosion, and moisture ingress
Application
The 8221G3HW is ideal for hot water on/off control in commercial HVAC systems, hydronic heating, boiler circuits, and industrial process piping. The NEMA 4X enclosure makes it well-suited for installations in wet or corrosive environments such as mechanical rooms, rooftop equipment, and food-service facilities.
Specifications
- SKU: 8221G3HW
- Brand: ASCO
- Valve Type: 2-Way Solenoid Valve
- Operation: Normally Closed (N/C), Pilot Operated, Slow Closing
- Pipe Size: 1/2″ NPT
- Coil Voltage: 120VAC
- Flow Coefficient (Cv): 3.5
- Pressure Range: 5–150 PSI
- Media: Hot Water
- Body Material: Brass
- Seal Material: NBR (Buna-N)
- Enclosure Rating: NEMA 4X
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