Description
1/2" WRAS N/Open Water Solenoid Valve – Danfoss EV220BNO
The Danfoss 132U1501 is a 1/2" 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 provides a 15mm orifice, Kv 4.0 m³/h flow capacity and 0.3–16 Bar operating pressure, together with an anti-water-hammer design for controlled water shut-off.
The 132U1501 replaces the previous Danfoss 032U7117, 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 normally open configuration allows flow through the valve without electrical power. Energising the solenoid closes the valve, making it particularly suitable for applications requiring fail-safe open operation.
The servo-assisted diaphragm requires a minimum 0.3 Bar differential pressure for reliable operation.
1/2" BSP Connection & Flow
Port Size: 1/2" BSP
Orifice Size: 15mm
Kv Flow Factor: 4.0 m³/h
The 15mm internal orifice provides excellent flow capacity for a compact 1/2" normally open water valve.
Anti-Water-Hammer Operation
Opening Time: 0.04 Seconds
Closing Time: 0.35 Seconds
The EV220BNO incorporates an anti-water-hammer design, with controlled closing helping reduce hydraulic shock and pressure surges in water pipework.
This is particularly useful in mains-water systems, building services and installations where sudden shut-off could otherwise produce damaging water hammer.
Brass & Stainless Construction
Body Material: Brass
Internal Components: Stainless Steel
Seal Material: EPDM
Seals & Gaskets: WRAS Approved
The brass body, stainless steel internal components and WRAS-approved EPDM seals provide a robust construction for potable-water applications.
WRAS Approved for Potable Water
The EV220BNO is configured with WRAS approved EPDM seals and gaskets, making it suitable for potable-water installations.
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
The Class H continuous-duty coil is designed for reliable operation where the valve may remain energised for extended periods.
Voltage Options
✓ 12V DC
✓ 24V DC
✓ 24V AC
✓ 110V AC
✓ 230V AC
Voltage Tolerance: ±10%
Dimensions & Weight
Overall Length: 80mm
Body Width: 52mm
Coil Width: 46mm
Overall Height: 99mm
H1 Dimension: 15mm
Weight: Approximately 0.7kg
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 132U1501 combines WRAS-approved construction, normally open operation and 16 Bar pressure capability in a compact 1/2" brass valve.
Its 15mm orifice and Kv 4.0 m³/h provide high flow capacity, while the pressure-assisted diaphragm and anti-water-hammer design provide controlled switching for demanding water systems.
Most importantly, its normally open fail-safe configuration means the valve remains open without electrical power and closes when energised, providing the opposite operating function to the normally closed EV220BW range.
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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