Description
1" WRAS N/Open Water Solenoid Valve – Danfoss EV220BNO
The Danfoss 132U2501 is a 1" WRAS approved normally open brass solenoid valve designed for reliable control of potable water systems where flow is required when electrical power is removed.
This 2/2 way normally open, pressure-assisted valve combines a 25mm orifice, Kv 11 m³/h flow capacity and 0.3–16 Bar operating pressure with controlled anti-water-hammer operation.
The 132U2501 replaces the previous Danfoss 032U7127, providing a useful cross-reference for existing installations.
Valve Function & Operation
Function: 2/2 Way Normally Open
Operation: Pressure Assisted
Fail Position: Open
Energised Position: Closed
Minimum Pressure Differential: 0.3 Bar
Maximum Operating Pressure: 16 Bar
The pressure-assisted diaphragm requires a minimum 0.3 Bar differential pressure for reliable operation.
The normally open configuration means the valve remains open without electrical power and closes when energised, providing fail-safe open operation.
1" BSP Connection & High Flow
Port Size: 1" BSP
Orifice Size: 25mm
Kv Flow Factor: 11 m³/h
The large 25mm flow path provides excellent capacity through 1" pipework, making the valve suitable for higher-flow potable and process-water installations.
Anti-Water-Hammer Operation
Opening Time: 0.3 Seconds
Closing Time: 1.0 Second
Controlled closing helps reduce sudden changes in water velocity when the normally open valve is energised closed.
This helps minimise hydraulic shock, pressure surges and water hammer in commercial and industrial water systems.
Brass & Stainless Construction
Body Material: Brass
Internal Components: Stainless Steel
Seal Material: EPDM
The combination of a brass valve body, stainless steel internal components and WRAS-approved EPDM sealing provides robust construction for potable-water applications.
WRAS Approved for Potable Water
The valve is configured with WRAS approved EPDM seals for potable-water applications.
Typical Media:
✓ Potable Water
✓ Mains Water
✓ Process Water
✓ Water Treatment Systems
✓ Compatible EPDM-Suitable Fluids
Maximum Fluid Viscosity: 50 cSt
Solenoid Coil
Coil Type: BB
DC Coil Power: 18 Watts
AC Coil Power: 10 Watts
Insulation Class: Class H 180°C
Duty Cycle: 100% Continuous
Protection: IP65 With Connector
Electrical Connection: DIN 43650A
Electrical Connector: Included
Voltage Options
✓ 12V DC
✓ 24V DC
✓ 24V AC
✓ 110V AC
✓ 230V AC
Voltage Tolerance: ±10%
Dimensions & Weight
Overall Length: 109mm
Body Width: 70mm
Coil Width: 46mm
Overall Height: 113mm
H1 Dimension: 22mm
Weight: Approximately 1.3kg
Typical Applications
✓ Potable Water Distribution
✓ Commercial Plumbing Systems
✓ Building Services
✓ Water Treatment Equipment
✓ Filtration Systems
✓ Industrial Water Control
✓ Cooling Water Systems
✓ Process Water Systems
✓ Fail-Safe Open Water Control
✓ Water Hammer Sensitive Systems
Why Choose the Danfoss EV220BNO?
The Danfoss 132U2501 combines WRAS-approved construction, normally open operation and a 16 Bar pressure capability in a high-flow 1" brass valve.
Its 25mm orifice and Kv 11 m³/h provide substantial flow capacity, while the pressure-assisted diaphragm and controlled closing characteristic help reduce water hammer.
The normally open fail-safe design is particularly useful where water flow needs to continue during an electrical power failure, with power applied only when the valve needs to close.
Available Normally Open Sizes
1/2" BSP – 15mm – Kv 4.0 m³/h
3/4" BSP – 20mm – Kv 8.0 m³/h
1" BSP – 25mm – Kv 11 m³/h
1¼" BSP – 32mm – Kv 18 m³/h
1½" BSP – 40mm – Kv 24 m³/h
2" BSP – 50mm – Kv 40 m³/h
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