Key Features

✓ 1/8″–1/4″ BSP pneumatic valve

✓ 3/2 way single solenoid

✓ Normally closed operation

✓ 2 to 8 Bar operating pressure

✓ 18/22mm aluminium body

✓ Internal pilot operation

✓ Low power solenoid coil

✓ IP65 protection

✓ 100% continuous duty

✓ DIN43650 electrical connection

✓ Wide voltage options available

✓ Optional ATEX Ex mb coil

✓ ATEX Gas Zone 1 suitable

✓ ATEX Dust Zone 21 suitable

✓ Manual override button

✓ Compact manifold mounting

✓ Fast reliable switching

✓ Free next day UK delivery

Datasheets

Description

1/8" & 1/4" 3/2 Way Pneumatic Solenoid Valve – BM320 / BM320N

The BM320 Series is a compact range of 3/2 way pneumatic solenoid valves designed for reliable control of single-acting pneumatic cylinders, actuators and pilot-operated pneumatic systems.

Available as normally closed BM320 or normally open BM320N versions, the range combines internal pilot operation with a durable anodised aluminium body, manual override and compact construction for industrial automation, OEM machinery and pneumatic control systems.

Available with 1/8" or 1/4" BSP ports and effective flow areas up to 16mm², the BM320 Series provides a flexible solution for general industrial compressed air control.

Valve Specification

Function:

3/2 way normally closed – BM320

3/2 way normally open – BM320N

Operation: Internal pilot

Port sizes:

1/8" BSP – BM320(N)-01

1/4" BSP – BM320(N)-02

Optional threads: NPT or Rc

Effective orifice area:

1/8" – 12mm²

1/4" – 16mm²

Operating pressure: 1.5 to 8 Bar

Proof pressure: 9.9 Bar

Body: Anodised aluminium alloy

Seals: NBR

Media: Compressed air and inert gases

Ambient temperature: -10°C to +60°C

Manual override: Lockable

Mounting position: Any position

Coil & Electrical Specification

1/8" Models

Duty cycle: 100% continuous duty

Protection rating: IP65

Insulation class: Class F

Standard coil connection: DIN

Flying lead option available

1/4" Models

Duty cycle: 100% continuous duty

Protection rating: IP65

Insulation class: Class F

Standard coil connection: DIN

DIN43650B or flying lead options available

Voltage tolerance: ±10%

Voltage Options

12V DC

24V DC

24V AC

110V AC

220V AC

Other voltages available as options.

ATEX / IECEx Coil Option – 1/4"

Optional Nass Magnet System 8/22 explosion-protected solenoid operator available for hazardous area applications.

✓ Ex mb IIC T4 Gb

✓ Ex mb tb IIIC T130°C Db

✓ Zone 1 gas and Zone 21 dust

✓ ATEX Category 2G / 2D

✓ Gas Group IIC / Dust Group IIIC

✓ Protection rating: IP65

✓ 100% continuous duty

✓ Ambient: -20°C to +50°C

✓ ATEX: PTB 00 ATEX 2001 X

✓ IECEx: IECEx PTB 05.0006X

✓ ATEX Directive: 2014/34/EU

ATEX Zone 1 & Zone 21 Suitability

When correctly assembled with the specified ATEX-certified solenoid coil, the BM520T is suitable for hazardous-area pneumatic applications.

ATEX Gas: Zone 1 – Category 2G

ATEX Dust: Zone 21 – Category 2D

Gas marking: II 2G Ex mb IIC T4 Gb

Dust marking: II 2D Ex mb tb IIIC T130°C Db

ATEX coil certificate: PTB 00 ATEX 2001 X

Valve body: Aluminium alloy

Media: Compressed air

Operating pressure: 2 to 8 Bar

Ambient temperature: -10°C to +60°C

ATEX suitability applies when fitted with the specified ATEX-certified coil and operated within the manufacturer's stated conditions.

Valve Operation

BM320 – Normally Closed

In the normal de-energised position, the compressed air supply is closed.

When the solenoid is energised, internal pilot pressure shifts the valve spool to supply compressed air to the outlet port.

Removing electrical power allows the valve to spring return to its normally closed position.

BM320N – Normally Open

In the normal de-energised position, compressed air is supplied to the outlet.

When the solenoid is energised, internal pilot pressure shifts the spool and closes the air supply.

Removing electrical power returns the valve to its normally open position.

The lockable manual override allows valve operation during commissioning, machine setup, maintenance and fault diagnosis without electrical actuation.

Typical Applications

Single-acting pneumatic cylinders

Pneumatic actuators

Pilot air control

Industrial automation

OEM machinery

Packaging equipment

Assembly machinery

Process control systems

Pneumatic control panels

Machine automation

General compressed air systems

Quality & Reliability

The BM320 Series uses an anodised aluminium body with a specially machined internal spool bore designed to minimise friction and provide reliable long-term operation.

Technical Information

Valve type: 3/2 way solenoid valve

Operation: Internal pilot

Functions: Normally closed or open

Port sizes: 1/8" or 1/4" BSP

Effective area: 12mm² or 16mm²

Operating pressure: 1.5 to 8 Bar

Proof pressure: 9.9 Bar

Body: Anodised aluminium alloy

Media: Compressed air and inert gases

Ambient temperature: -10°C to +60°C

Protection: IP65

Insulation class: Class F

Duty cycle: 100% continuous

Net weight:

1/8" – approximately 115g

1/4" – approximately 180g

HS Code: 8481201000

Related Products & Categories

3/2 Way Pneumatic Valves

5/2 Way Pneumatic Valves

5/3 Way Pneumatic Valves

Fittings & Polyurethane Tubing

Other Pneumatic Accessories & Valves

Filters Regulators Lubricator FRL Air Treatment

View Technical Specification

Technical Specification

Brand: Shako Co Ltd

Model: BM320

Width: 18.00 mm

Height: 35.00 mm

Depth: 88.00 mm

Weight: 0.12 kg

Valve / Product Type: Solenoid Valve

Body Material: Aluminium

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

Port Size: 1/4 thread, 1/8 thread

Function: 3/2 Normally Closed, 3/2 Normally Open

Operation: Pressure Assisted from 0.5 Bar

Pressure: 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

Seals: NBR

Media: Air, Gases (Non Aggressive)

Options required: Manifold, Manual Override

Orifice: 4.0mm, 8.0mm

Approvals:: ATEX Exm, ATEX Exia, IP65

Found in these Categories

Reviews

★★★★★5.0 / 5 4 reviews

★★★★★

Ordered 3 1/8 3/2 way air valves, received free next day delivery by FedEx, superb service. Recommended..

Reviewed on 29/09/2023 by Alan

★★★★★ Verified Purchase

Excellent service by sales team helping source the correct solenoid valve for our application. Valve arrived promptly and is as described.

Reviewed on 19/04/2025 by Roy J - Macduff, United Kingdom

★★★★★ Verified Purchase

A fantastic valve add into our road rail vehicle to gain independent operation on the rail wheels. They were easy to install and operating perfectly. A very well constructed valve with great scope for use.

Reviewed on 02/02/2026 by Alan M - Lossiemouth, United Kingdom

★★★★★ Verified Purchase

Excellent website easy to navigate and order valve required with PDF manuals. Efficient quick parcel delivery & well packaged.

Reviewed on 04/10/2026 by John B

1/8→1/4"BSP 3/2 Pneumatic Solenoid Valve Single 18/22mm Body

Name: 1/8→1/4"BSP 3/2 Pneumatic Solenoid Valve Single 18/22mm Body
Brand: Shako Co Ltd
SKU: BM320
Price: 25.69 GBP
Availability: InStock
Rating: 5.0 (4 reviews)