Description
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 back feeding of gases which could lead to unwanted gas mixtures
- low pressure drops – using complex valve assembly with low opening pressures (approx. 4 mbar)
- brass filter protects the non-return valve (check valve) against flashbacks, 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 in accordance with EN 746-2
- non-return valves (check valves) are proved in accordance with DIN EN ISO 5175-2. They may also be used as a safety device to protect against flashbacks (proved in accordance with DIN EN ISO 5175-1 point 6.7), which may result from the combustion of natural gas/ LPG with air
- 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
Approvals
Company certified to ISO 9001 and PED 97/23/EG Module H
CE-marked in accordance with PED 97/23/EC
Cleaned for Oxygen Service according to EIGA IGC Doc 13/12/E: Oxygen Pipeline and Piping Systems
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