Single AVSU

The Single Area Valve Service Unit (AVSU’s) are manufactured under BS EN 13485 Medical Devices: Quality Management Systems and Medical Devices Directive 93/42/EEC class IIb. They provide a local gas isolation facility for use during normal installation and maintenance or in the event of an emergency. They are built in accordance with the HTM02-01, C11 and BS EN 18082 standards and are suitable for Oxygen, Nitrous Oxide, Oxy-Nitrous Oxide, MA4, MA7, CO2 and Vacuum (other gasses available upon request).

More Information
  • The AVSU can be installed as a flush or surface mounted.

  • Housed in a steel white epoxy coated box and a key-operated 90° lock for security with 20,000 lock combinations.

  • Gas Identification is located on the body of the AVSU behind the window and is immovable.

  • A large viewing window to the door gives an immediate indication of Gas Identification located on the body of AVSU, valve position and flow direction.

  • In an emergency, this can be gained by pulling the window thus allowing access to the valve. The anti-Tamper device can be fitted to the window and connected to our Digital Alarm and BMS to incorporate monitoring of all CPX AVSU’s.

  • The valve type is a 90° shut off ball valve, which is operated via a red ergonomic handle, each unit comes complete with a blanking plate which can be fitted, to either side of the valve.

  • Non-interchangeable NIST connectors are fitted upstream and downstream of the valve. Including 100% sealing serviceable non-return valves to allow the pipeline to be pressure tested and provide an easily accessible point for gas sampling.

  • Pressure sensors shall be fitted inside the box to enable local monitoring and servicing via Copper Sensing Pipe.

  • Side entry sizes available 22mm, 28mm, 35mm and 42mm (other entry versions available).

Product Codes

Product Code



Single AVSU


AVSU Module (Semi Flush or Surface Type)


Compact AVSU Module

Example:   AVSU22-O2

22mm AVSU – Oxygen

Example:   AVSU-MOD-POLY-3A

3 Gas AVSU Module (Semi Flush or Surface Type)


AVSU Module – 3 Gas Compact c/w Digital Alarm

Standards & Requirements
  • HTM 02-01 and SHTM 02-01: Medical Gas Pipeline Systems.

  • BS EN 7396: Pipeline Systems for Compressed Medical Gases and Vacuum.

  • C11 NHS: Model Engineering Specification – Medical Gases.

  • BS EN 10524-2: Pressure Regulators.

  • BS EN 21969 High-Pressure Flexible Connectors.

  • Service and Maintenance: Throughout the UK and worldwide our approved team of service and maintenance engineers provide immediate technical support.