Non-Return Valve NV400

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, G 1.1/2 - G 2

safety element: non-return valve [NV]
every non-return valve 100% tested
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
use is possible for applications according to EN 746-2

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
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