Description
ASCO 8221G7HW 2-Way Normally Closed Solenoid Valve Overview
The ASCO 8221G7HW is a heavy-duty, pilot-operated solenoid valve engineered for reliable hot water control in demanding HVAC and hydronic applications. Featuring a 2-way, normally closed configuration, this valve remains closed when de-energized and opens fully upon energization — providing fail-safe shutoff performance critical to system protection. The slow-closing design minimizes water hammer and pressure surges, extending the service life of connected piping and equipment.
Key Features
- 2-Way, Normally Closed (NC) configuration for fail-safe shutoff
- 1″ NPT pipe connection for straightforward installation
- 120VAC coil voltage for compatibility with standard commercial control circuits
- 11.5 Cv flow coefficient for high-capacity flow performance
- Operating pressure range: 5–150 PSI
- Pilot-operated design for efficient, low-power actuation
- Slow-closing operation reduces water hammer and system stress
- Brass body construction for corrosion resistance and durability
- NBR (Buna-N) seals compatible with hot water media
- NEMA 4X enclosure rating — suitable for indoor and outdoor use, watertight and corrosion-resistant
Specifications
- SKU: 8221G7HW
- Brand: ASCO
- Valve Type: 2-Way Solenoid Valve
- Operation: Normally Closed (NC)
- Pipe Size: 1″ NPT
- Coil Voltage: 120VAC
- Flow Coefficient (Cv): 11.5
- Pressure Range: 5–150 PSI
- Actuation: Pilot Operated
- Closing Speed: Slow Closing
- Body Material: Brass
- Seal Material: NBR (Nitrile Butadiene Rubber)
- Enclosure Rating: NEMA 4X
- Media: Hot Water
Applications
- Hot water shutoff and control in HVAC hydronic systems
- Boiler and heating system flow control
- Commercial and industrial water distribution
- Process control systems requiring pilot-operated actuation
- Installations requiring NEMA 4X-rated enclosures for wet or corrosive environments
Why Choose the ASCO 8221G7HW?
ASCO is a globally recognized leader in solenoid valve technology, and the 8221G7HW delivers on that reputation with a robust brass body, dependable NBR seals, and a NEMA 4X-rated coil enclosure that stands up to harsh installation environments. The pilot-operated, slow-closing mechanism ensures smooth, controlled valve actuation — protecting your system from pressure spikes while delivering consistent, repeatable performance across its full 5–150 PSI operating range.
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