Key Features

1/2" Normally Open Valve
De-Energised Open
2/2 Way Operation
Pressure Assisted Diaphragm
0.5–10 Bar Pressure Range
Large 13mm Orifice
High Flow Kv 40 L/min
Brass Valve Body
Stainless Steel Internals
NBR Seals Standard
EPDM, FKM & HNBR Options
Up to +180°C with FKM
15W Nass Magnet Coil
IP65 100% Duty Coil
AC & DC Voltage Options
Optional ATEX / IECEx Coil
Zone 1 Gas / Zone 21 Dust
Air, Water & Light Oils

Datasheets

Description

1/2" Normally Open Brass Solenoid Valve 0.5–15 Bar – SHAKO PU225AN

The SHAKO PU225AN is a high-flow 1/2" BSP normally open brass solenoid valve designed for reliable automatic control of water, compressed air, light oils and other compatible fluids. Featuring a pressure-assisted diaphragm, large 13mm orifice and Kv flow factor of 40 L/min, this 2/2 way valve provides efficient flow control across a differential pressure range of 0.5 to 15 bar.

Unlike a normally closed solenoid valve, the PU225AN remains open when electrical power is removed and closes when energised. This fail-open operation makes it particularly suitable for cooling water circuits, process equipment and industrial systems where continued flow is required during a power failure.

Manufactured by SHAKO with a durable brass body, stainless steel internal components and interchangeable seal options, the PU225AN combines dependable performance with a wide choice of electrical supply voltages.

Normally Open Operation

The PU225AN operates as a 2/2 way normally open solenoid valve using a pressure-assisted diaphragm mechanism.

Power OFF → Valve OPEN – Fluid flows through the valve.

Power ON → Valve CLOSED – Electrical power energises the solenoid and closes the valve.

Power Failure → Valve returns to its normally open position, provided the operating conditions allow correct diaphragm operation.

The pressure-assisted design requires a minimum differential pressure of 0.5 bar and is therefore unsuitable for gravity-fed or zero-pressure systems.

Pressure & Flow Performance

The PU225AN provides high flow capacity through a 13mm internal orifice, making it suitable for applications requiring dependable fluid control without excessive flow restriction.

Operating Pressure: 0.5 to 15 bar differential
Orifice Diameter: 13mm
Kv Flow Factor: 40 L/min
Valve Function: 2/2 way normally open
Operating Principle: Pressure-assisted diaphragm
Connection: 1/2" BSP female
Optional Connection: 1/2" NPT female

The large flow passage is particularly beneficial in cooling systems, industrial water distribution and compressed air installations.

Brass Construction & Seal Options

The SHAKO PU225AN features a robust brass valve body with stainless steel internal components for reliable industrial service.

Body Material: Brass
Internal Components: Stainless steel
Standard Diaphragm Seal: NBR
Optional Seals: EPDM, FKM (Viton®) and HNBR

Different seal materials are available to accommodate variations in media compatibility and operating temperature.

Seal Temperature Ranges

NBR: -15°C to +80°C
EPDM: -5°C to +130°C
FKM (Viton®): -10°C to +180°C
HNBR: -40°C to +150°C

These are seal-dependent temperature ranges. The maximum permitted temperature of the complete valve assembly may be lower, depending on the coil, operating conditions and selected configuration.

Suitable Media

The PU225AN is designed for controlling a range of compatible industrial fluids, including:

Compressed air
Water
Cooling water
Light oils
Neutral liquids
Compatible inert gases

Maximum recommended fluid viscosity is 50 cSt.

Media compatibility must be confirmed against the brass body, stainless steel internals and selected diaphragm material.

Solenoid Coil & Electrical Options

The standard PU225AN is fitted with a Nass Magnet solenoid coil designed for continuous industrial operation.

Coil Power: 15 Watts
Insulation Class: H
Duty Rating: 100% ED continuous
Electrical Connection: DIN 43650A Form A
Ingress Protection: IP65 with suitable connector correctly fitted

Available Voltages

DC: 12V, 24V, 48V, 110V and 220V DC.

AC: 12V, 24V, 36V, 48V, 110V, 230V and 380V AC, 50/60Hz.

Voltage availability depends on the selected coil configuration.

Optional ATEX / IECEx Solenoid Coil

For hazardous-area applications, the PU225AN can be supplied with an optional explosion-protected Nass Magnet solenoid operator.

The existing PTB-certified coil configuration includes:

Gas Protection: Ex mb IIC T4 Gb
Dust Protection: Ex mb tb IIIC T130°C Db
Gas Classification: ATEX Category 2G
Dust Classification: ATEX Category 2D
Suitable Areas: Zone 1 gas and Zone 21 dust
ATEX Certificate: PTB 03 ATEX 2086 X
IECEx Certificate: IECEx PTB 05.0005X
ATEX Directive: 2014/34/EU

The legacy PTB coil certification details apply only to the corresponding certified coil versions.

Replacement TÜV NORD-certified Nass Magnet coils are being introduced under updated manufacturer part numbers. Their applicable certificates and operating limits should be checked against the exact coil supplied.

Hazardous-area suitability must be assessed for the complete valve assembly and installation, not solely the solenoid coil.

Typical Applications

Industrial cooling water circuits
Fail-open water control systems
Compressed air installations
Industrial process automation
Water circulation equipment
General-purpose fluid control
OEM machinery
Pneumatic control systems
Equipment requiring flow on power loss
Hazardous-area installations with suitable certified components

Technical Specification

Manufacturer: SHAKO Co Ltd

Model: PU225AN-04

Valve Type: 2/2 Way Normally Open

Function: De-energised Open / Energised Closed

Operating Principle: Pressure-Assisted Diaphragm

Port Size: 1/2" BSP Female

Optional Thread: NPT Female

Operating Pressure: 0.5–15 Bar Differential

Orifice Diameter: 13mm

Kv Flow Factor: 40 L/min

Body Material: Brass

Internal Components: Stainless Steel

Standard Seal: NBR

Optional Seals: EPDM, FKM and HNBR

Suitable Media: Water, Air, Light Oils and Compatible Neutral Fluids

Maximum Media Viscosity: 50 cSt

Standard Coil: Nass Magnet 15W

Coil Insulation: Class H

Duty Rating: 100% ED Continuous

Electrical Connection: DIN 43650A Form A

Ingress Protection: IP65 with Connector

Voltage Options: AC and DC

ATEX / IECEx: Optional Certified Solenoid Operator

HS Code: 84818030

Why Choose the SHAKO PU225AN?

The SHAKO PU225AN combines high-flow performance, normally open fail-safe operation and durable brass construction in a compact industrial solenoid valve.

Its 13mm orifice, 0.5–15 bar differential pressure range and choice of diaphragm materials make it a versatile solution for cooling water, compressed air and industrial fluid control applications.

✓ Normally Open – Power to Close

✓ High-Flow 13mm Orifice

✓ 0.5–15 Bar Operating Pressure

✓ Brass Body & Stainless Internals

✓ Optional ATEX / IECEx Coil

✓ Free Next Day UK Delivery

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View Technical Specification

Technical Specification

Brand: Shako Co Ltd

Model: NOPU22504

Width: 48.00 mm

Height: 106.50 mm

Depth: 66.50 mm

Weight: 0.78 kg

Valve / Product Type: Solenoid Valve

Body Material: Brass

Voltage: 110vAC, 110vDC, 12vDC, 200vDC, 230VAC, 24vAC, 24vDC, 380vAC, 48vAC, 48vDC

Port Size: 1/2 thread

Function: 2/2 Failsafe Open

Operation: Pressure Assisted from 0.5 Bar

Pressure: 3 Bar, 3.5 Bar, 4 Bar, 4.5 Bar, 5 Bar, 5.5 Bar, 6 Bar, 6.5 Bar, 7 Bar, 7.5 Bar, 8 Bar, 8.5 Bar, 9 Bar, 10 Bar

Seals: EPDM, HNBR, NBR, FKM (Viton)

Approvals:: ATEX Exm, IP65

Media: Air, Fluid (Non Aggressive), Gases (Non Aggressive), Oils + Fuels 50cSt Max, Water

Orifice: 13mm

Found in these Categories

1/2" Brass Solenoid Valve 0.5-15 Bar 2/2 Way Normally Open

Name: 1/2" Brass Solenoid Valve 0.5-15 Bar 2/2 Way Normally Open
Brand: Shako Co Ltd
SKU: PU22504A
Price: 79.20 GBP
Availability: InStock

£79.20 incl. VAT £66.00 ex. VAT

-37% Was ~~£126.46~~ incl. VAT

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Brand: Shako Co Ltd

Model: NOPU22504

Stock: 460 in stock

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Key Features

Datasheets

Description

1/2" Normally Open Brass Solenoid Valve 0.5–15 Bar – SHAKO PU225AN

Normally Open Operation

Pressure & Flow Performance

Brass Construction & Seal Options

Seal Temperature Ranges

Suitable Media

Solenoid Coil & Electrical Options

Available Voltages

Optional ATEX / IECEx Solenoid Coil

Typical Applications

Technical Specification

Why Choose the SHAKO PU225AN?

Related Products & Categories.

Technical Specification

Found in these Categories

1/2" Brass Solenoid Valve 0.5-15 Bar 2/2 Way Normally Open

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