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

Non-return valve, stainless steel, for the prevention of unintended gas mixtures, for flow rates up to 285,916 scfh (air), up to 232 psi for use in thermal processing plants, certified to EN746-2, G 1.1/2 - G 2

safety element: non-return valve [NV]
every non-return valve 100% tested
ultra-low opening pressures (approx. 0.0435 psi), ultra-low pressure drop
ideal for biogas desulphurization systems
also ideal for use with corrosive gases
dirt filter (100 μm) on gas inlet
3.51 X 5.66 inches, 105.32-106.6 oz

Information

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
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 (check 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 (check 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 (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

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