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
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.
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
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
