Description
ASCO 8221G5-24VDC 2-Way Normally Closed Solenoid Valve Overview
The ASCO 8221G5-24VDC 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 upon receiving a 24VDC signal — providing a safe, fail-safe design ideal for water systems. The slow-closing operation minimizes water hammer and pressure surges, protecting piping and connected equipment.
Key Features
- 2-Way Normally Closed (N/C) configuration — fail-safe closed on power loss
- Pilot-operated design for efficient, low-power actuation
- Slow-closing action reduces water hammer and system stress
- 3/4″ NPT pipe connection for easy installation
- 24VDC coil voltage for compatibility with standard low-voltage control systems
- 5.5 Cv flow coefficient for reliable water flow capacity
- Operating pressure range: 5–125 PSI
- Brass body construction for corrosion resistance and durability
- NBR (Buna-N) seals for compatibility with water media
- NEMA 4 enclosure rating — suitable for indoor and outdoor use, protected against splashing water and windblown dust
Specifications
- SKU: 8221G5-24VDC
- Brand: ASCO
- Valve Type: 2-Way Solenoid Valve
- Operation: Normally Closed (N/C)
- Actuation: Pilot Operated, Slow Closing
- Pipe Size: 3/4″ NPT
- Coil Voltage: 24VDC
- Flow Coefficient (Cv): 5.5
- Pressure Range: 5–125 PSI
- Media: Water
- Body Material: Brass
- Seal Material: NBR (Buna-N)
- Enclosure Rating: NEMA 4
Applications
- Commercial and industrial HVAC water systems
- Chilled and hot water distribution control
- Cooling tower makeup water control
- Hydronic heating and cooling systems
- General water on/off control in building automation
Why Choose ASCO?
ASCO is a globally recognized leader in fluid automation and solenoid valve technology. The 8221 Series is purpose-built for dependable, long-cycle performance in demanding HVAC and industrial environments. The NEMA 4 enclosure ensures the coil and electrical components are protected from moisture and contaminants, making this valve suitable for both indoor mechanical rooms and outdoor installations.
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