WITT non-return valves (check valves) for reliable protection against dangerous reverse gas flow. Every non-return valve (check valve) 100% tested.
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 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 (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 DIN EN ISO 5175-2.
WITT non-return valves (check valves) may be mounted in any position / orientation
the maximum ambient / working temperature is 70 °C / 158 °F
annual testing of the non-return valve (check valve), body leak tightness and flow capacity 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 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