Non-Return Valve NV2000

Non-return valve for the prevention of unintended gas mixtures, for flow rates up to 26800 m³/h (air), for use in thermal processing plants, certified to EN746-2, DN 80-200

  • safety element: non-return valve [NV]
  • every non-return valve 100% tested
  • ultra-low opening pressures (approx. 5 mbar), ultra-low pressure drop
  • dirt filter (100 μm) in the gas inlet
  • to be mounted in vertical position / orientation
  • in accordance with EN 746-2
  • 320-340 X 393-450 mm, 50 kg

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    WITT non-return valves for reliable protection against dangerous reverse gas flow.
    Every non-return valve 100% tested.


    • a spring-loaded non-return valve prevents a reverse flow of gases which could lead to unwanted gas mixtures
    • low pressure drops – using complex valve assembly with low opening pressures, NV2000 approx. 5 mbar
    • no leaks – using of a spring-loaded valve assembly with elastomer sealing
    • stainless steel filter (100 μm) in the gas inlet protects the non-return valve against dirt contamination, extending the service life
    • diverse applications – useful for many technical gases

    Operation / Usage:

    • non-return valves are used to protect equipment and pipelines against dangerous reverse gas flow. Use is possible for applications in accordance with EN 746-2
    • the NV2000 may be mounted vertical in bottom-up flow direction
    • the maximum ambient / working temperature is 70 °C / 158 °F


    • annual testing of the non-return valve and body leak tightness is recommended
    • WITT is happy to supply special test equipment
    • non-return valves are only to be serviced by the manufacturer

    Company certified to ISO 9001 and PED 2014/68/EU Module H
    CE-marked in accordance with PED 2014/68/EU
    Designed for Oxygen Service in accordance with EIGA 13/20 and CGA G-4.4: Oxygen Pipeline and Piping Systems
    Cleaned for Oxygen Service in accordance with EIGA 33/18 and CGA G-4.1: Cleaning of Equipment for Oxygen Service


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