Non-Return Valve NV400, Stainless Steel (formerly 339-ES)

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
• 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

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
• 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 70 °C / 158 °F

Maintenance:

• 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. The dirt filter may be replaced 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