Description
ASCO 8221G25 Solenoid Valve Overview
The ASCO 8221G25 is a 2-way, normally open, pilot-operated solenoid valve engineered for reliable water control in demanding HVAC and industrial applications. Featuring a slow-closing design that minimizes water hammer, this valve is built to handle system pressures from 5 to 150 PSI and delivers a flow coefficient (Cv) of 5.5 for efficient fluid management. The 3/4″ NPT connection makes it a straightforward drop-in replacement or new installation in standard piping systems.
Key Features
- 2-Way, Normally Open configuration — valve opens when de-energized, closes when energized
- Pilot-operated, slow-closing design minimizes water hammer and system shock
- 3/4″ NPT pipe connection for easy integration into standard plumbing and HVAC systems
- 120VAC coil voltage for compatibility with common control circuits
- Flow coefficient (Cv) of 5.5 for optimized water flow performance
- Operating pressure range: 5–150 PSI
- Brass body construction for corrosion resistance and long service life
- NBR (Buna-N) seals for reliable performance with water media
- NEMA 4 enclosure rating — suitable for indoor and outdoor use, protected against splashing water and hose-directed water
Specifications
- SKU: 8221G25
- Brand: ASCO
- Valve Type: 2-Way Solenoid Valve
- Operation: Normally Open (N/O)
- Actuation: Pilot Operated
- Closing Action: Slow Closing
- Pipe Size: 3/4″ NPT
- Voltage: 120VAC
- Flow Coefficient (Cv): 5.5
- Pressure Range: 5–150 PSI
- Media: Water
- Body Material: Brass
- Seal Material: NBR (Buna-N)
- Enclosure Rating: NEMA 4
Applications
- HVAC water distribution and control systems
- Hydronic heating and cooling circuits
- Commercial and industrial water shut-off applications
- Irrigation and process water control
- Building automation and zone control systems
Why Choose the ASCO 8221G25?
ASCO is a globally recognized leader in solenoid valve technology, and the 8221G25 reflects that heritage of quality. The slow-closing pilot-operated mechanism protects piping infrastructure from damaging pressure surges, while the NEMA 4 enclosure ensures the coil assembly withstands wet and washdown environments. The brass body and NBR seals are specifically suited for water service, providing long-term durability and leak-free performance across a wide pressure range.
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