ASCO 8221G3 Solenoid Valve

The ASCO 8221G3 is a high-performance 2-way normally closed solenoid valve designed specifically for reliable water service in industrial and commercial HVACR applications. Engineered with a pilot-operated diaphragm, this 1/2" NPT valve features a slow-closing design that effectively eliminates water hammer, protecting your piping system from pressure surges. The brass body construction and NBR seals ensure durability and leak-proof performance across a pressure range of 5 to 150 PSI. Operating on 120Vac, this ASCO RedHat series valve provides a flow capacity of 3.5 Cv, making it ideal for high-flow cooling and potable water systems. The NEMA 4 enclosure offers superior protection against dust and water ingress, ensuring long-term reliability in demanding environments. Whether you are replacing an existing ASCO water valve or designing a new fluid control system, the 8221G3 delivers the precision and safety required for modern building automation and process control.

• Water Hammer Prevention: The slow-closing feature minimizes hydraulic shock, extending the lifespan of your plumbing and components.
• Robust Construction: A heavy-duty brass body and nitrile (NBR) elastomers provide excellent chemical compatibility with water.
• Reliable Actuation: The 120V AC solenoid coil is designed for continuous duty, providing consistent normally closed operation.
• High Flow Efficiency: A 3.5 Cv flow coefficient allows for significant volume throughput with minimal pressure drop.
• Weatherproof Protection: The NEMA 4 rated housing makes this valve suitable for indoor or outdoor installations exposed to moisture.

Common Questions:

How do I stop water hammer in my HVAC system?
Installing a slow-closing solenoid valve like the ASCO 8221G3 is the most effective way to dampen the internal pressure spikes that cause water hammer noise and pipe damage.

What is the minimum pressure required for this valve to open?
As a pilot-operated valve, it requires a minimum differential pressure of 5 PSI to lift the diaphragm and allow flow.

Can this ASCO valve be used in outdoor environments?
Yes, the 8221G3 comes equipped with a NEMA 4 enclosure, which is designed to withstand rain, splashing water, and windblown dust.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.