Gas non-return valve NV400

brassspring

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 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 EN 730-2. They may also be used as a safety device to protect against flashbacks (proved in accordance with EN 730-1 point 6.7), which may result from the combustion of natural gas/ LPG with air 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), 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