Description
ASCO 8221G5 2-Way Normally Closed Solenoid Valve Overview
The ASCO 8221G5 is a heavy-duty, 2-way normally closed solenoid valve engineered for reliable water control in demanding HVAC, plumbing, and industrial applications. With a pilot-operated, slow-closing design, this valve minimizes water hammer and pressure surges — protecting downstream equipment and extending system life. The brass body and NBR (Buna-N) seals deliver excellent resistance to water and a wide range of compatible media, while the NEMA 4 enclosure rating ensures dependable performance in wet or wash-down environments.
Key Features
- 2-way, normally closed (NC) configuration — valve closes automatically when de-energized for fail-safe operation
- Pilot-operated, slow-closing design reduces water hammer and pressure surges
- 3/4″ NPT pipe connection for easy installation into standard plumbing and HVAC systems
- 120VAC coil voltage for compatibility with standard commercial and industrial control circuits
- 5.5 Cv flow coefficient for efficient, high-flow water service
- Operating pressure range: 5–150 PSI
- Brass body construction for corrosion resistance and long service life
- NBR (Buna-N) seals compatible with water and a broad range of media
- NEMA 4 enclosure rating — suitable for indoor/outdoor use, splash-proof and hose-directed water resistant
Specifications
- SKU: 8221G5
- Brand: ASCO
- Valve Type: 2-Way Solenoid Valve
- Operation: Normally Closed (NC)
- Actuation: Pilot Operated, Slow Closing
- Connection Size: 3/4″ NPT
- Coil Voltage: 120VAC
- Flow Coefficient (Cv): 5.5
- Pressure Range: 5–150 PSI
- Body Material: Brass
- Seal Material: NBR (Buna-N)
- Enclosure Rating: NEMA 4
- Media: Water
Applications
- HVAC water supply and shutoff control
- Commercial and industrial water systems
- Irrigation and process water control
- Boiler feed and hydronic system control
- Wash-down and wet environment installations
Why Choose the ASCO 8221G5?
ASCO is a globally recognized leader in solenoid valve technology, trusted by HVAC professionals and mechanical contractors for decades. The 8221G5 combines robust brass construction, a slow-closing pilot-operated mechanism, and a NEMA 4 rated enclosure to deliver dependable, long-lasting performance in water control applications. Whether you’re retrofitting an existing system or specifying for a new installation, the ASCO 8221G5 is a proven solution built to handle the rigors of commercial and industrial service.
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