ASCO 8221G31 Solenoid Valve

The ASCO 8221G31 Solenoid Valve is a high-performance 2-way normally open valve engineered for precision water control in industrial and commercial HVACR systems. Designed with a 1 1/2" NPT connection and a robust brass body, this pilot-operated valve features a specialized slow closing mechanism. This integral snubber significantly reduces water hammer, protecting your piping infrastructure from damaging pressure spikes and vibration without the need for additional surge suppressors. Operating on a 120Vac power supply, the unit provides a consistent 24 Cv flow capacity within a pressure range of 5-150 PSI. Built for durability, it includes resilient NBR seals and a Nema 4 enclosure, ensuring reliable performance in watertight and dust-tight environments. Whether managing hot or cold water lines, this ASCO RedHat series valve offers the "soft close" technology essential for maintaining system integrity and high-throughput efficiency.

• Water Hammer Prevention: The built-in snubber design slows the closing speed to eliminate hydraulic shock.
• High Flow Efficiency: A 24 Cv rating ensures maximum throughput for high-demand industrial water applications.
• Industrial Grade Construction: Features a corrosion-resistant forged brass body and rugged NBR (Buna-N) elastomers.
• Reliable NEMA 4 Protection: The watertight enclosure ensures the solenoid operator remains protected from moisture and debris.
• Normally Open Configuration: Ideal for fail-safe systems where flow must be maintained during power loss.

Common Questions

How does the slow-closing feature work on the ASCO 8221G31?
The valve utilizes an internal snubber that regulates the disc's movement. By slowing the final stage of the closing cycle, it prevents the sudden kinetic energy transfer that causes water hammer in large pipe diameters like 1 1/2".

What is the minimum pressure required for this valve to function?
As a pilot-operated valve, the 8221G31 requires a minimum pressure differential of 5 PSI to open. Once operational, it can typically maintain its position with a differential as low as 3 PSI.

Can this valve be used for potable drinking water?
Standard brass ASCO valves are generally intended for industrial water control. Since they are not explicitly certified as lead-free under certain drinking water acts, they are best suited for process water, HVAC systems, and commercial laundry or sterilizer applications.

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.

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