Key Features

✓ Zero-pressure operation from 0 Bar

✓ No minimum pressure differential required

✓ 2/2 way normally closed operation

✓ De-energised CLOSED / energised OPEN

✓ Direct-acting design

✓ UL & CSA approved coil

✓ Vacuum rated to 10⁻⁶ Torr

✓ 3mm, 4mm or 5mm orifice options

✓ Up to 10 Bar AC operating pressure

✓ Up to 7 Bar DC operating pressure

✓ Maximum 50 cSt media viscosity

✓ Fast response – 20ms maximum opening / closing time

✓ Brass body with stainless steel internals

✓ Standard FKM (Viton®) seals

✓ Wide choice of optional seal materials

✓ Class H continuous-duty coil

✓ IP67 protection with connector fitted

✓ Optional manual override

✓ Optional silver shading ring

✓ Optional NPT thread

✓ Optional oxygen-degreased version

✓ Optional ATEX / IECEx explosion-protected operator

Datasheets

1/4" BSP Brass Solenoid Valve 0–10 Bar 2/2 Normally Closed

★★★★★ 4.7 / 5 (3 reviews)

£42.59 incl. VAT £35.49 ex. VAT

-26% Was ~~£57.78~~ incl. VAT

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Brand: CS Fluid Power Co Ltd

Model: AD8

Stock: 456 in stock

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Description

1/4" Zero Pressure Brass Solenoid Valve – CS AD8

CS Fluid Power Direct-Acting Normally Closed Solenoid Valve

The CS Fluid Power AD8 is a compact 1/4" direct-acting 2/2 way normally closed brass solenoid valve designed for vacuum, zero-pressure and general industrial fluid and gas control applications.

Unlike pressure-assisted or pilot-operated valves, the direct-acting design requires no minimum pressure differential, allowing reliable operation from 0 Bar and making the AD8 particularly suitable for vacuum, low-pressure and intermittent pressure applications.

Available with 3mm, 4mm or 5mm orifices, the AD8 series provides a choice of flow and pressure capabilities to suit air, water, light oils, inert gases, vacuum and compatible fluids up to 50 cSt.

Key Features

✓ Zero-pressure operation from 0 Bar

✓ No minimum pressure differential required

✓ 2/2 way normally closed operation

✓ De-energised CLOSED / energised OPEN

✓ Direct-acting design

✓ UL & CSA approved coil

✓ Vacuum rated to 10⁻⁶ Torr

✓ 3mm, 4mm or 5mm orifice options

✓ Up to 10 Bar AC operating pressure

✓ Up to 7 Bar DC operating pressure

✓ Maximum 50 cSt media viscosity

✓ Fast response – 20ms maximum opening / closing time

✓ Brass body with stainless steel internals

✓ Standard FKM (Viton®) seals

✓ Wide choice of optional seal materials

✓ Class H continuous-duty coil

✓ IP67 protection with connector fitted

✓ Optional manual override

✓ Optional silver shading ring

✓ Optional NPT thread

✓ Optional oxygen-degreased version

✓ Optional ATEX / IECEx explosion-protected operator

Model & Performance Options

AD8A

Orifice: 3.0mm

Kv Flow Factor: 4.3 L/min

AC Pressure: 0 to 10 Bar

DC Pressure: 0 to 7 Bar

AD8B

Orifice: 4.0mm

Kv Flow Factor: 9.7 L/min

AC Pressure: 0 to 7 Bar

DC Pressure: 0 to 5 Bar

AD8C

Orifice: 5.0mm

Kv Flow Factor: 10.7 L/min

AC Pressure: 0 to 5 Bar

DC Pressure: 0 to 3.5 Bar

Based on water with 1 Bar pressure drop.

Typical Applications

Vacuum systems

Pneumatic control circuits

Compressed air systems

Low-pressure gas control

Water control

Light oil and fuel systems

Oxygen service when specifically degreased

OEM machinery

Laboratory and test equipment

General industrial automation

Technical Specification

Function: 2/2 way normally closed

Valve State: De-energised CLOSED / energised OPEN

Operation: Direct acting

Minimum Pressure Differential: 0 Bar

Port Size: 1/4" BSPP female

Optional Threads: NPT or Rc

Orifice Sizes: 3.0mm, 4.0mm or 5.0mm

Kv Flow Factor: 4.3 to 10.7 L/min

Maximum AC Pressure: 10 Bar according to orifice

Maximum DC Pressure: 7 Bar according to orifice

Vacuum Rating: 10⁻⁶ Torr

Maximum Media Viscosity: 50 cSt

Opening / Closing Time: 20ms maximum

Mounting Position: Any position

Body Material: Brass

Internal Components: Stainless steel

Tube / Spring: 304 stainless steel / brass

Armature: 430F stainless steel

Standard Seal: FKM (Viton®)

Optional Seals: EPDM, NBR, Silicone, PTFE, VST, Neoprene, ECO, HNBR, Hypalon or Butyl IIR

Shading Ring: Copper

Optional Shading Ring: Silver

Manual Override: Optional

Media Compatibility

Suitable for:

Air and inert gases

Water

Light oils

Compatible fuels

Vacuum applications

Neutral gases

Non-corrosive liquids

Compatible fluids and gases up to 50 cSt

Oxygen service when specifically ordered in degreased configuration

Temperature Limits

NBR: up to +100°C

FKM (Viton®): up to +120°C

EPDM: up to +120°C

Silicone: up to +120°C

PTFE: up to +120°C

VST: up to +120°C

Other seal materials available subject to application requirements.

Ambient Temperature: -10°C to +50°C

Coil & Electrical

Standard Coil: WPG1

DC Power Consumption: 12 Watts

AC Inrush: 11.2 VA

AC Holding: 8.2 VA

Insulation Class: Class H 180°C

Duty Rating: 100% continuous duty

Connector: DIN 43650A

Protection: IP67 with connector fitted

Electrical Connection: 3-spade DIN 43650A

UL / CSA approved coil

Voltage Options

DC: 12V or 24V

AC: 24V, 110V or 230V (50/60Hz)

Voltage Tolerance: -10% / +15%

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 media temperature: +80°C

✓ ATEX Certificate: PTB 03 ATEX 2086 X

✓ IECEx Certificate: IECEx PTB 05.0005X

✓ ATEX Directive: 2014/34/EU

Oxygen Service Option

A specially degreased version is available for oxygen service.

All oil and grease contamination is removed during the cleaning process. Seal selection and operating conditions must be specified when ordering for oxygen applications.

Benefits

✓ Operates reliably from 0 Bar

✓ No minimum differential pressure required

✓ Vacuum compatible to 10⁻⁶ Torr

✓ Choice of three orifice sizes

✓ Up to 10 Bar operating pressure

✓ Fast 20ms maximum response

✓ Compact direct-acting construction

✓ Wide choice of sealing materials

✓ Any-position mounting

✓ Optional manual override

✓ Optional oxygen-degreased version

✓ Optional ATEX / IECEx operator

✓ Reliable continuous-duty operation

Why Choose the AD8 Direct-Acting Valve?

The AD8 is particularly useful where a conventional pilot-operated solenoid valve cannot function because there is insufficient pressure differential across the valve.

Its direct-acting design operates from 0 Bar and under vacuum, making it suitable for low-pressure systems, vacuum lines and applications where system pressure may fluctuate or fall completely to zero.

The three available orifice sizes allow the valve to be selected according to the required balance between maximum pressure and flow capacity — from the 3mm AD8A rated up to 10 Bar AC, through to the higher-flow 5mm AD8C with Kv 10.7 L/min.

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View Technical Specification

Technical Specification

Brand: CS Fluid Power Co Ltd

Model: AD8

Width: 19.00 mm

Height: 85.00 mm

Depth: 41.00 mm

Weight: 0.48 kg

Valve / Product Type: Solenoid Valve

Body Material: Brass

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

Port Size: 1/4 thread

Function: 2/2 Failsafe Closed

Operation: Direct Acting

Seals: ECO, EPDM, FKM (Viton), HNBR, Hypalon, NBR, Neoprene, PTFE (Teflon), Silicone, VST

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

Options required: Degreased, Manual Override, Mounting Holes

Orifice: 3.0mm, 4.0mm, 5.0mm

Approvals:: ATEX Exm, IP65, IP66, IP67, CSA, UL

Pressure: Vacuum, 0.02 Bar (20 mBar), 0.1 Bar (100 mBar), 0.2 Bar (200 mBar), 0.3 Bar (300 mBar), 0.4 Bar (400 mBar), 0.5 Bar (500 mBar), 0.6 Bar (600 mbar), 0.7 Bar (700 mBar), 0.8 Bar (800 mBar), 1 Bar, 1.2 Bar, 1.3 Bar, 1.4 Bar, 1.5 Bar, 1.6 Bar, 2 Bar, 2.5 Bar, 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

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Reviews

★★★★★4.7 / 5 3 reviews

★★★★★

Excellent Buying Experience and honest communication recommend

Reviewed on 23/05/2020 by Elijah

★★★★★

I had great service from the knowledgeable staff, followed up with quick (and free) delivery. On fitting the valve, I had a problem and there was no hesitation in taking back the valve to test it. Even though it turned out not to be the supplied valve, the staff were still very helpful and keen to help me resolve things. I'll definitely buy from Solenoid Valves/Connexion Developments again. Thx and Regards M Clifford

Reviewed on 13/03/2023 by Mick

★★★★★ Verified Purchase

excellent service - fast delivery - excellent product and great value for money. A++

Reviewed on 15/09/2025 by David H - Abingdon, United Kingdom

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Key Features

Datasheets

1/4" BSP Brass Solenoid Valve 0–10 Bar 2/2 Normally Closed

Description

1/4" Zero Pressure Brass Solenoid Valve – CS AD8

CS Fluid Power Direct-Acting Normally Closed Solenoid Valve

Key Features

Model & Performance Options

Typical Applications

Technical Specification

Media Compatibility

Temperature Limits

Coil & Electrical

Voltage Options

ATEX / IECEx Coil Option

Oxygen Service Option

Benefits

Why Choose the AD8 Direct-Acting Valve?

Related Products & Categories

Technical Specification

Found in these Categories

Reviews

★★★★★4.7 / 5 3 reviews

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