The Asco EF8025B221 Solenoid Valve is an explosionproof steam shutoff device engineered for secure isolation in power-interlocked systems. The Latched Closed, No Voltage Release configuration keeps steam lines sealed when energized and only opens when power is removed. Its brass body, PTFE disc, and high-temperature seals offer strong protection in pressure-heavy steam circuits.
For Standard Enclosure: Asco 8025B221 Solenoid Valve
Technical Specifications
- Valve Type: Manual Reset, Special Service Pilot, Latched Closed
- Pipe Size: 1″ NPT
- Flow Factor (Cv): 13.5
- Operating Pressure Differential:
- Steam: 5 to 125 psi
- Maximum Fluid Temperature:
- AC: 353°F (178°C)
- DC: 353°F (178°C)
- Body Material: Brass
- Seal Material: PTFE Disc with EPDM, FPM, and PTFE Seals
- Voltage Options:
- AC (60Hz): 24, 120, 240, 480V
- DC: 6, 12, 24, 120, 240V
- Watt Rating:
- AC: 20 watts
- DC: 36.2 watts
- Coil Insulation Class: F (AC), H (DC)
- Solenoid Enclosure:
- Explosionproof and Watertight, Types 3, 7(C and D), and 9
Key Features and Functionality
- Explosionproof Steam Service Design: Rated for hazardous locations and high-temp fluid.
- Fails Open During Power Loss: Enables venting or flow continuation on trip.
- Manual Reset for Operator Oversight: Requires manual action before reactivation.
- High-Temperature Seal Package: Compatible with 353°F continuous steam service.
- Mounting Flexibility Ensured: Operates in any installed orientation.
Compatible Components and Related Parts
- ASCO RedHat II Coil Series
- ASCO Manual Reset Lever Kits
- ASCO Seal Kit for 8025 Series
- ASCO Explosionproof Solenoid Enclosure
Industry Applications
- Steam Distribution Manifolds: Trips open during power cuts to protect piping.
- Thermal Loop Shutdowns: Safely vents steam when the coil is de-energized.
- Processing Plant Boilers: Isolates or reintroduces steam during fault states.
- Heat Exchanger Control: Manages pressure relief during electrical failure.
- Sterile Environment Utilities: Provides manual reset control in critical zones.
Compliance and Approvals
- UL Listed
- CSA Certified
- CE Compliant
- Explosionproof and Watertight, Types 3, 3S, 4, 4X, 6, 6P, 7, and 9
- Explosionproof and Raintight, Types 3, 7, and 9
Installation and Operational Notes
- Mount in any direction to suit the system layout.
- A manual reset is required after a valve trip.
- Use approved conduit and seals in hazardous areas.
- Confirm the coil voltage and insulation class before use.
- Designed exclusively for steam service environments.
Series Catalog
Asco 8015/8025 Manual Reset Valves
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