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Non-Return Valve NV400

Data sheet Quotation request

Non-return valve for the prevention of unintended gas mixtures, for flow rates up to 8100 m³/h (air), up to 16 bar, for use in thermal processing plants, certified to EN746-2

  • safety element: non-return valve [NV]
  • every non-return valve 100% tested
  • protects against flashbacks, for fuel gas-compressed air-mixtures
  • ultra-low opening pressures (approx. 3 mbar), ultra-low pressure drop
  • ideal for biogas desulphurisation systems
  • dirt filter (100 μm) on gas inlet
  • 90 X 145 mm, 2.789 g

This model is also available in Stainless Steel

Information

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

Benefits:

  • 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 NV400 – approx. 3.0 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 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 are used to protect equipment and pipelines against dangerous reverse gas flow. Use is possible for applications in accordance with EN 746-2
  • non-return valves are proved in accordance with DIN EN ISO 5175-2. They may also be used as a safety device to protect against flashbacks (proved in accordance with DIN EN ISO 5175-1 point 6.7), which may result from the combustion of natural gas/ LPG with air
  • WITT non-return valves may be mounted in any position / orientation
  • the maximum ambient / working temperature is 70 °C / 158 °F

Maintenance:

  • annual testing of the non-return valve, body leak tightness and flow capacity is recommended
  • WITT is happy to supply special test equipment
  • non-return valves are only to be serviced by the manufacturer. The dirt filter may be replaced according to model by competent staff

Approvals
Company certified to ISO 9001 and PED 2014/68/EC Module H
CE-marked in accordance with PED 2014/68/EC
Cleaned for Oxygen Service according to EIGA IGC Doc 13/12/E: Oxygen Pipeline and Piping Systems

Downloads

Here you find all downloads for the product.

Accessories

Test Rig 722

For the annual testing of WITT flashback arrestors and non-return valves

Applications

Non-Return Valve NV400 is used in following areas:

Products

WITT Zentrale

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Headquarters: +49 (0)2302-8901-0
WITT UK: +44 (0)1925 234466

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