WITT non-return valves for reliable protection against dangerous reverse gas flow. Flow-optimised valve system causes a very low-pressure drop at minimal noise emission. 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 drop – using complex valve assembly with low opening pressures (ca. 4 mbar)
• stainless steel filter (100 μm) in the gas inlet protects the non-return valve against dirt contamination, extending the service life
• flow-optimised valve system for:

           – ultra low-pressure drop

           – minimal noise emission

• no leaks – using of a spring-loaded valve assembly with elastomer sealing
• in accordance with DIN EN ISO 5175-2
• available in brass or stainless steel
• 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
• the same size as model NV200 for easy replacement

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
• WITT non-return valves may be mounted in any position/orientation
• in ambient temperatures above -20 °C / 68 °F and below 70 °C / 158 °F

Maintenance

• annual testing of the non-return valve and body leak tightness is recommended
• WITT is happy to supply special test equipment
• non-return valves are only to be serviced by the manufacturer

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