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

Benefits:

• 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, NV800 approx. 6 – 8 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
• non-return valves (check valves) are proved in accordance with EN 730-2. They may also be used as a safety device to protect against flashbacks (proved in accordance with EN 730-1 point 6.7), which may result from the combustion of natural gas/ LPG with air
• the maximum ambient/working temperature is 70 °C / 158 °F

Maintenance:

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

Approvals 
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