Non-return Valve ULTRA 12

Witt Non Return Valves ULTRA 12

Witt Non Return Valves ULTRA 12Witt Non Return Valves ULTRA 12
WITT Non-return valve ULTRA 12, brassWITT Non-return valve ULTRA 12, brass
Witt Non Return Valves ULTRA 12 Stainless Steel and AluminumWitt Non Return Valves ULTRA 12 Stainless Steel and Aluminum
Data sheet Quotation request

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



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.


Non-return Valve ULTRA 12 is used in following areas:


Give us a call!

Headquarters: +49 (0)2302-8901-0
WITT USA: +1 770-664-4447

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