Description
1" High Pressure Normally Open Solenoid Valve – NOPU225H-08
25 Bar Brass Normally Open Solenoid Valve – SHAKO PU225HN-08
The SHAKO NOPU225H-08 (PU225HN-08) is a high-pressure 1" pressure-assisted 2/2 way normally open brass solenoid valve designed for demanding fluid and gas control applications at pressures up to 25 Bar.
The valve is open when de-energised and closes when energised, making it suitable for systems requiring flow to be maintained or automatically restored following loss of electrical power.
Featuring a forged brass body, SUS304 stainless steel internals and a nylon-reinforced diaphragm, the NOPU225H-08 provides reliable high-pressure operation with excellent flow capacity and quick response. Suitable for compressed air, water, light oils and compatible gases, with alternative seal materials available for improved media compatibility.
Typical Applications
High-pressure water systems
Compressed air installations
Fail-open process control systems
Industrial process equipment
Pneumatic equipment
Water treatment equipment
Medical and healthcare equipment
Boiler and utility systems
Light oil systems
OEM machinery
General industrial automation
Technical Specification
Function: 2/2 way normally open
Valve State: De-energised OPEN / Energised CLOSED
Operation: Pressure-assisted pilot operated diaphragm
Minimum Pressure Differential: 0.5 Bar
Operating Pressure Range: 0.5 to 25 Bar
Operating Pressure with ATEX Coil: 0.5 to 20 Bar maximum
Proof / Test Pressure: 30 Bar
Port Size: 1" BSPP female
Optional Threads: NPT or Rc
Orifice Size: 13.0mm
Kv Flow Factor: 64.5 L/min based on water with 1 Bar pressure drop
Body Material: Forged brass
Internal Components: SUS304 stainless steel
Standard Seal: NBR
Diaphragm: Nylon reinforced
Optional Seals: EPDM, FKM (Viton®) or HNBR
Suitable Media: Compressed air, water, light oils and compatible fluids and gases up to 50 CST
Maximum Media Temperature: +90°C
Ambient Temperature: -10°C to +60°C
Seal Material Options
NBR: Standard general-purpose seal for air, water, neutral gases and mineral oils
EPDM: Optional for water and compatible fluids
FKM (Viton®): Optional for oils, fuels and compatible chemicals
HNBR: Optional for applications requiring improved chemical compatibility
Maximum media temperature is +90°C regardless of seal material due to the nylon-reinforced diaphragm construction.
Coil & Electrical Specification
Coil System: Nass Magnet System 13/36
Power Consumption: 18.5 Watts
Insulation Class: Class H
Duty Rating: 100% continuous duty
Protection Rating: IP65 with connector fitted
Electrical Connector: DIN 43650 Form A
Connector: Included
Voltage Options
DC:
12VDC, 24VDC, 48VDC, 110VDC or 220VDC
AC 50/60Hz:
12VAC, 24VAC, 48VAC, 110VAC, 230VAC or 380VAC
ATEX / IECEx Coil Option
Optional Nass Magnet explosion-protected solenoid operator available.
✓ Ex mb IIC T4 Gb
✓ Ex mb tb IIIC T130°C Db
✓ Suitable for Zone 1 gas and Zone 21 dust hazardous areas
✓ ATEX Category 2G / 2D
✓ Protection rating: IP65
✓ Maximum operating pressure: 20 Bar
✓ Maximum media temperature: +80°C
✓ ATEX Certificate: PTB 03 ATEX 2086 X
✓ IECEx Certificate: IECEx PTB 05.0005X
✓ ATEX Directive: 2014/34/EU
Important: Standard NOPU225H-08 operation is rated to 25 Bar. When fitted with the ATEX explosion-protected operator, maximum operating pressure is reduced to 20 Bar and maximum media temperature to +80°C.
Why Choose a Normally Open High Pressure Valve?
Normally open high-pressure solenoid valves are useful where flow is required in the de-energised state or must automatically resume following electrical power loss.
The NOPU225H-08 combines this fail-open function with operation up to 25 Bar, a 30 Bar proof/test pressure and a high-flow 13mm orifice with Kv 64.5 L/min, making it particularly suitable for demanding industrial fluid and gas control.
Benefits
✓ Fail-open operation on power loss
✓ High-pressure capability up to 25 Bar
✓ 30 Bar proof / test pressure
✓ High-flow 13mm orifice
✓ Quick-response diaphragm design
✓ Reinforced diaphragm for durability
✓ Suitable for fluids and gases
✓ Serviceable diaphragm construction
✓ Free UK delivery available
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