Description
WRAS Approved Normally Open Water Solenoid Valve for Potable Water Systems
The SHAKO PU225DN-03 is a WRAS approved 3/8" brass normally open solenoid valve designed for potable water, priority demand systems and fire sprinkler applications. The valve remains open without power and closes when energised, making it ideal for fail-safe water control systems where flow must be maintained during a power failure.
Its pilot-operated diaphragm design provides high flow rates with low power consumption, whilst the anti-water-hammer construction helps protect pipework and equipment from hydraulic shock.
Key Features
✓ WRAS approved for potable water applications
✓ 2/2 way normally open operation
✓ Failsafe open – energise to close
✓ Ideal for priority demand and sprinkler systems
✓ High flow 13mm orifice
✓ Kv 40 L/min flow capacity
✓ Pressure assisted diaphragm design
✓ Anti-water-hammer construction
✓ Brass body with stainless steel internals
✓ EPDM WRAS approved seals
✓ IP65 DIN 43650A coil included
✓ 100% continuous duty rated
✓ AC and DC voltage options available
✓ Optional PWM power-saving connector for 24vDC models
✓ Free UK delivery available
Typical Applications
Potable water distribution systems
Priority demand water systems
Fire sprinkler installations
Water treatment equipment
Commercial buildings
Process water control
Irrigation systems
General industrial water control
Technical Specification
Function: 2/2 way normally open
Operation: Pilot operated diaphragm
Fail Position: Open
Pressure Range: 0.5 to 10 Bar differential pressure
Maximum Working Pressure: 15 Bar
Minimum Operating Differential: 0.5 Bar
Orifice: 13.0mm
Flow Factor (Kv): 40 L/min
Opening / Closing Time: Approx. 0.5 seconds
Port Size: 3/8" BSP female
Optional Connection: NPT
Body Material: Brass
Internal Materials: Brass and stainless steel
Seal Material: EPDM (WRAS Approved)
Media: Potable water and compatible liquids
Media Temperature: -5°C to +130°C
Coil Specification
Power Consumption: 15 Watts
Coil Manufacturer: Nass Magnet
Protection Class: IP65
Connector: DIN 43650 Form A
Duty Rating: 100% ED Continuous Duty
Available Voltages
AC 50/60Hz: 12v, 24v, 36v, 48v, 110v, 230v or 380v
DC: 12v, 24v, 48v, 110v or 220v
WRAS Approval
The EPDM sealing materials are approved for use with potable drinking water systems.
WRAS Approval Certificate: 2304324
Why Choose a Normally Open Solenoid Valve?
Normally open solenoid valves are commonly used where continuous water flow is required during a power failure. Typical applications include priority demand systems, emergency water supplies and sprinkler installations where the valve must automatically return to the open position if electrical power is lost.
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