Non-Return Valve NV400 intermediate flange version

Non-return valve stainless steel (intermediate flange version) 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, DN 40/50

with welding neck flanges for simple installing and removing
safety element: non-return valve [NV]
every non-return valve 100% tested
DIN EN ISO 5175-2
ultra-low opening pressures (approx. 3 mbar), ultra-low pressure drop
ideal for biogas desulphurisation systems
also ideal for use with corrosive gases
dirt filter (100 μm) on gas inlet

Информация

WITT non-return valves for reliable protection against dangerous reverse gas flow. Now available also with welding neck flanges for simple installing and removing. Every non-return valve 100% tested.

Benefits

a spring loaded non-return valve prevents back feeding of gases which could lead to unwanted gas mixtures
low pressure drops – using complex valve assembly with low opening pressure – approx. 3.0 mbar
no leaks – using of 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
dirt filter in gas inlet are replaced quickly and easily
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
non-return valve as „intermediate flange version“ guarantees quick and uncomplicated removal and installation at replacement and annual testing
maximum flexibility – screwed non-return valve as well as installed between flanges. Complete (non-return valve + flange-set) or as add-on kit available
spacer tubes around threaded rods (M16) for secure centering of non-return
flange connection with weld-on connecting according to EN 1092-1 Type11
equal length in brass and stainless steel non-return valves for optimal interchangeability and combination with flange kits (as well as DN40 and DN50)

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
non-return valves are tested to DIN EN ISO 5175-2
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 according to ISO 9001 and PED 2014/68/EU Module H
CE-marked according to PED 2014/68/EU
Cleaned for Oxygen Service according to EIGA IGC Doc 13/12/E: Oxygen Pipeline and Piping Systems