Non-return Valve / Check Valve ULTRA 12

Based on ULTRA 10 – your customized design: multiple combinations of housing and seal materials, with or without filter

  • free combination of material for housing (brass, stainless steel, aluminum) and seal (NBR/CR, FPM/FKM, EPDM/FFKM), with or without filter
  • for special requirements e.g. corrosive environments, acetylene, lightweight construction, temperatures above 70 °C/ 158 °F

based on ULTRA 10 including:

  • safety element: non-return valve [NV]
  • every non-return valve 100% tested
  • DIN EN ISO 5175-2
  • ultra-low opening pressures (approx. 4 mbar), ultra-low pressure drop
  • compact and light: 35 X 60 mm, 221 g, G ½"
  • minimal noise emission


Data sheet Downloads
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WITT non-return valves for reliable protection against dangerous reverse gas flow. Flow-optimised valve system causes very low pressure drop at minimal noise emission. Every non-return valve 100% tested.

ULTRA 12 is based on ULTRA 10 and is customized according to the requirements of the customer - ideal for special requirements. A modular system which allows flexible material combinations for housing and sealings.


Combination possibilities

  • housing available in brass, stainless steel or aluminium
  • sealings of NBR, CR, FKM, EPDM, FFKM for example
  • with or without dirt filter in gas inlet



  • precisely tailored design for special requirements. For example corrosive environments, acetylene, ultra-lightweight construction, temperatures above 70 °C / 158 °F
  • a spring loaded non-return valve prevents back feeding of gases which could lead to unwanted gas mixtures
  • low pressure drop – using complex valve assembly with low opening pressures (approx. 4 mbar)
  • stainless steel filter (100 μm) in the gas inlet protects the non-return valve against dirt contamination, extending the service life
  • flow-optimised valve system for:

     - ultra low pressure drop
     - minimal noise emission

  • no leaks – using of a spring loaded valve assembly with elastomer sealing
  • in accordance to DIN EN ISO 5175-2
  • available in brass, stainless steel or aluminium
  • diverse applications – useful for many technical gases
  • reduce installation costs – the spring loaded valve is not affected by gravity and may be installed in any orientation

Operation / Usage

  • non-return valves are used to protect equipment and pipelines against dangerous reverse gas flow.
  • Use is possible for applications according to EN 746-2
  • WITT non-return valves may be mounted in any position / orientation



  • 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 according to ISO 9001
Cleaned for Oxygen Service according to EIGA IGC Doc 13/12/E: Oxygen Pipeline and Piping Systems


Here you find all downloads for the product.

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