Non-Return Valve 800-ES. MWP: 300Bar. ¼”NPT

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Max. working pressure: 240 bar (O2)

Max. working pressure: 300 bar (Other gases – see pdf)

Air max: see pdf

Opening pressure: 2 bar

Suitable for the following gases:

Natural gas, Methane



Compressed air

Non-flammable gases

Body: stainless steel

Sealing material: Elastomer

Thread size: 1/4″ NPT M

Item #: 812
Quantity Available: 100

100 in stock


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
  • no leaks – using of a spring-loaded valve assembly with elastomer sealing, opening pressure approx. 2 bar
  • diverse applications – useful for many technical gases

Operation / Usage:

  • non-return valves are used to protect equipment and pipelines against dangerous reverse gas flow
  • ideal for use with corrosive gases in the chemical industry, process technology or in laboritories
  • WITT non-return valves may be mounted in any position /orientation
  • the maximum ambient / working temperature is 150 °C / 302 F° (max. 60 °C / 140 °F at oyxgen)


  • annual testing of the non-return valve and body leak tightness is recommended
  • non-return valves are only to be serviced by the manufacturer

Company certified to ISO 9001 and PED 2014/68/EC Module H
CE-marked in accordance with PED 2014/68/EC


View PDF File


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