The Asco 8221G027 Solenoid Valve (8221G27) is a pilot-operated, two-way slow-closing solenoid valve in a normally open configuration. It is designed to protect liquid systems from pressure spikes caused by water hammers, eliminating the need for additional suppression devices in most water applications.
Technical Specifications
- Valve Type: Pilot Operated, Normally Open, 2-way
- Pipe Size: 1″ NPT
- Flow Factor (Cv): 11.5
- Operating Pressure Differential
- Water: 5 to 150 psi (AC)
- Maximum Fluid Temperature: 180˚F (80˚C)
- Body Material: Brass
- Seal Material: NBR (Nitrile Butadiene Rubber) and PTFE
- Voltage Options:
- AC (60Hz): 24, 120, 240, 480V
- AC (50Hz): 110, 220V
- DC: 6, 12, 24, 120, 240V
- Watt Rating:
- AC: 16.1 watts
- Coil Insulation Class: F
- Solenoid Enclosure:
- Standard: RedHat II (Watertight, Types 1-4X); RedHat (Type I)
- Optional:
- RedHat II (Explosionproof & Watertight, Types 3-9)
- RedHat (Explosionproof & Raintight, Types 3, 7, 9).
Key Features and Functionality
- Snubber Mechanism: For reducing water hammer & protecting downstream piping.
- Pilot-Operated Design: For efficient energy usage and stable flow management.
- Durable Construction: Long-term performance under fluctuating pressures and temperatures.
- Wide Temperature Range: Supports hot water applications up to 180°F.
- Simplified Maintenance: Easily accessible components and standardized coil replacements.
Compatible Components and Related Parts
- ASCO RedHat II AC Coils are rated for the required voltage and ambient temperature.
- Optional Explosionproof Coil Assemblies for Hazardous Environments.
- Standard Mounting Kits for secure installation on piping or control panels.
- Pilot Valve Repair Kits for seal replacement and extended service life.
Industry Applications
- Water Treatment & Distribution: For controlled fluid handling and water hammer reduction.
- Industrial Fluid Control: For facilities with frequent valve cycling.
- Cooling & Heating Systems HVAC: For regulated flow and stable shutoff characteristics.
- Commercial Plumbing/Pumping Stations: Reliable flow control and minimal external dampeners.
Compliance & Approvals
- CSA Certified
- UL Listed (General Purpose Valves)
- CE Compliant (RedHat II series)
Installation and Operational Notes
- Provide adequate clearance for maintenance and inspection.
- The conduit Connection should be sealed properly (NEMA 4/4X).
- The pressure Differential must be at least 5 psi to open; and maintain above 3 psi.
- Regular Seal Inspection is advised for higher-temperature or high-cycle environments.
- Verify Coil and Ambient Temperature Limits to ensure safety and consistent operation.
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