ASCO 8221G11 Solenoid Valve

The ASCO 8221G11 Solenoid Valve is a high-performance, 2-way normally closed solenoid valve specifically engineered to eliminate water hammer in industrial and commercial plumbing systems. Featuring a 1 1/2" NPT connection and a robust brass body, this pilot operated valve uses a specialized slow-closing mechanism to protect downstream components from damaging pressure surges. With a high flow coefficient of 24 Cv and a versatile operating pressure range of 5-150 PSI, it is an ideal solution for large-scale HVAC water control and distribution. The 120Vac coil is protected by a NEMA 4 enclosure, ensuring watertight and dust-tight performance in demanding environments, while the durable NBR seals (Buna-N) provide a reliable, leak-proof interface for water service up to 210°F. This slow closing solenoid is the industry standard for reducing noise and vibration in complex hydronic systems.

Key Benefits:

• Anti-Water Hammer Design: The internal snubber controls the disc closing speed to prevent mechanical shock and pipe vibration.
• High Flow Capacity: A 24 Cv rating ensures efficient liquid transfer through the 1.5-inch NPT ports without significant pressure drops.
• Environmental Protection: The NEMA 4 enclosure provides superior resistance to moisture and debris, suitable for indoor and outdoor installations.
• Industrial Durability: Forged brass body and NBR seals offer excellent wear resistance and long-term reliability in water-based applications.

Common Questions:

How does the slow-closing feature work?
The valve utilizes a pilot-operated diaphragm with a modified bleed orifice that restricts the flow of fluid back above the diaphragm, causing the valve to close gradually rather than instantly, which dissipates the energy that causes water hammer.

Can this valve be used for air or gas?
While the ASCO 8221G11 is optimized for water service, its materials are compatible with various neutral fluids. However, the slow-closing timing is calibrated for liquids; consult technical support if your application involves compressible gases.

What is the minimum pressure required for operation?
As a pilot operated valve, it requires a minimum differential pressure of 5 PSI to lift the diaphragm and maintain a fully open position.

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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