Description
11/4" High Flow WRAS Approved Normally Open Water Solenoid Valve
The SHAKO PU225DN-12 is a WRAS approved 1¼" brass normally open solenoid valve designed for potable water systems, priority demand installations and fire sprinkler applications. The valve remains open without power and closes when energised, making it ideal for fail-safe water control systems where uninterrupted water flow is required during power loss.
Featuring a large 38mm orifice and high Kv flow rate of 367 L/min, this pilot-operated diaphragm valve is particularly suited to commercial and industrial water systems requiring high flow capacity and reliable operation.
Key Features
✓ WRAS approved for potable water applications
✓ 2/2 way normally open operation
✓ Failsafe open – energise to close
✓ High-flow 38mm orifice design
✓ Kv 367 L/min flow capacity
✓ Suitable for priority demand and sprinkler systems
✓ Pressure assisted diaphragm operation
✓ Anti-water-hammer closing design
✓ Brass body with stainless steel internals
✓ EPDM WRAS approved seals
✓ IP65 DIN43650A coil included
✓ 100% continuous duty rated
✓ AC and DC voltage options available
✓ Optional ATEX hazardous area coil
✓ Optional PWM power-saving connector
✓ Free UK delivery available
Typical Applications
Potable water distribution systems
Priority demand water systems
Fire sprinkler installations
Water treatment equipment
Industrial process water systems
Commercial building services
Irrigation systems
High-flow water control applications
Technical Specification
Function: 2/2 way normally open
Operation: Pilot operated diaphragm
Fail Position: Open
Pressure Range: 0.5 to 15 Bar
Minimum Operating Differential: 0.5 Bar
Orifice: 38.0mm
Flow Factor (Kv): 367 L/min
Port Size: 1¼" BSPP female
Optional Connection: NPT
Body Material: Brass
Internal Materials: Stainless steel
Seal Material: EPDM (WRAS Approved)
Media: Potable water and compatible liquids
Media Temperature: -5°C to +130°C
Design Feature: Anti-water-hammer closing construction
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
DC: 12v, 24v, 48v, 110v or 220v
AC 50/60Hz: 12v, 24v, 36v, 48v, 110v, 230v or 380v
Optional ATEX Coil
An optional hazardous area ATEX coil is available for use in potentially explosive atmospheres.
Ex mb IIC T4
T4 Temperature Class
Suitable for Zone 21 and Zone 22 installations
Maximum media temperature +80°C
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 fire sprinkler installations where the valve automatically returns to the open position if electrical power is lost.
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