Non-Return Valve NV200. MWP: 16Bar. ½”, 3/4″, 1″BSP

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Max. working pressure: 16 bar

Air max: 1900m3/h

Opening pressure: 4mbar

Suitable for the following gases:

Town gas, Natural gas, LPG



Compressed air

Non-flammable gases

Body: Brass

Sealing material: NBR/CR

Thread sizes: 1/2″, 3/4″, 1″ BSP

Item #: 816
Quantity Available: 100

100 in stock


WITT non-return valves (check valves) for reliable protection against dangerous reverse gas flow.
Every non-return valve (check valve) 100% tested. The best non-return valves (check valves) in the world


  • a spring-loaded non-return valve (check 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 (Model NV200 – approx. 4 mbar)
  • no leaks – using a spring-loaded valve assembly with elastomer sealing
  • stainless steel filter (100 μm) in the gas inlet protects the non-return valve (check valve) against dirt contamination, extending the service life
  • 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 (check 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 (check valves) may be mounted in any position / orientation
  • the maximum ambient / working temperature is 70 °C / 158 °F


  • annual testing of the non-return valve (check valve) and body leak tightness is recommended
  • WITT is happy to supply special test equipment
  • non-return valves (check valves) are only to be serviced by the manufacturer. The dirt filter may be replaced by competent staff (only NV200, G 1)

On request:

“Smart-option” including

  • measurement of outlet pressure
  • measurement of outlet gas temperature
  • analogue 4 – 20 mA signals

Company certified to ISO 9001 and PED 97/23/EC Module H
CE-marked in accordance with PED 97/23/EC
Cleaned for Oxygen Service according to EIGA IGC Doc 13/12/E: Oxygen Pipeline and Piping Systems


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