Description
The ASCO 8220G407 is a heavy-duty, 2-way normally closed pilot-operated solenoid valve engineered for demanding steam and hot water applications in commercial and industrial HVAC systems. Built on a robust brass body with an EPDM diaphragm, this valve delivers reliable, leak-free shutoff and long service life in high-temperature fluid control environments.
Key Features
- 2-way, normally closed (NC) configuration — valve closes automatically upon power loss for fail-safe operation
- Pilot-operated design handles high flow rates with a low-power coil
- 3/4″ NPT end connections for straightforward installation into standard piping systems
- 120VAC coil voltage for compatibility with common commercial control circuits
- High flow capacity: 8.8 Cv flow coefficient minimizes pressure drop across the valve
- Brass body construction offers excellent corrosion resistance for steam and hot water service
- EPDM diaphragm provides superior resistance to hot water, steam, and mild chemicals
- NEMA 4X enclosure rating — protected against dust, water ingress, and corrosion; suitable for indoor and outdoor installations
Pressure & Media Ratings
- Steam service: 5–50 PSI operating pressure range
- Hot water service: 5–150 PSI operating pressure range
- Pilot-operated design requires a minimum differential pressure to open
Construction Details
- Body material: Brass
- Diaphragm material: EPDM (Ethylene Propylene Diene Monomer) — ideal for steam and hot water compatibility
- Enclosure: NEMA 4X rated coil housing for corrosion-resistant, weatherproof performance
- Connection type: 3/4″ NPT (National Pipe Thread)
Typical Applications
- Steam distribution and control in commercial HVAC boiler systems
- Hot water heating and hydronic system control
- Industrial process fluid shutoff
- Automated building control and BAS integration
- Outdoor or wash-down environments requiring NEMA 4X protection
The ASCO 8220G407 is a trusted solution for HVAC contractors, mechanical engineers, and facilities managers who require dependable solenoid valve performance across a wide range of steam and hot water pressures. Its NEMA 4X enclosure and brass construction make it equally at home in harsh outdoor environments or demanding mechanical rooms.
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