Asco Slow Closing Solenoid Valve NPT Normally Closed Brass

The Asco Series 221 (8221) slow-closing solenoid valve is a normally closed, 2-way brass water valve with NPT pipe connections. It is also called a slow-closing water solenoid valve or an anti-water-hammer solenoid valve. It is built for commercial and industrial water systems that need dependable on/off flow control without damaging pressure spikes.

Key Features:

• Slow-closing design: A specially designed snubber slows the disc closing speed to protect systems from water hammer damage.
• Less need for surge control: Pressure spikes from water hammer are reduced enough that suppressors or other controls are not needed in most water systems.
• Pilot-operated, normally closed operation: The valve stays closed when the coil is de-energized and opens when power is applied.
• Brass body: Brass body construction with NPTF threaded ports.
• Hot and cold water service: One valve line covers both hot and cold water service and is designed for quick, easy maintenance. Hot water service is rated to 150 psi (10 bar) differential at 210°F (100°C).
• Suited to demanding applications: Typical uses include laundries, molding, sterilizers and autoclaves.

Asco is a well-known name in fluid control and solenoid valves. This product line is a good choice where quiet, controlled shutoff and long-term reliability matter. Available variants differ in port size and coil voltage, so choose the one that matches your piping and electrical supply.