Non return / check valves - WITT-Gasetechnik - #1

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GRS 1 non-return valves www.wittgas.com WITT-Gasetechnik GmbH & Co KG K9 subject to change manufactures mixing, metering and control equipment as well as analysing systems and safety equipment for all common gases Benefits �œ�œ a spring loaded non-return valve prevents back feeding of gases which could lead to unwanted gas mixtures �œ�œ low pressure drops – using complex valve assembly with low opening pressures (approx. 4 mbar) �œ�œ brass filter protects the non-return valve against flashbacks, extending the service life �œ�œ diverse applications – useful for many technical gases �œ�œ reduce installation costs – the spring loaded valve is not affected by gravity and may be installed in any orientation Operation / Usage �œ�œ 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 �œ�œ they may also used as a safety device to protect against flashbacks (proved in accordance to EN 730) from natural gas with air �œ�œ the maximum ambient / working temperature is 70 °C / 158 °F Maintenance �œ�œ annual testing of the non-return valve, body leak tightness and flow capacity is recommended �œ�œWITT is happy to supply special test equipment �œ�œ non-return valves are only to be serviced by the manufacturer Approvals Company certified according to ISO 9001:2000, ISO 14001 and PED 97/23/EG Module H CE-marked according to: - PED 97/23/EC Model Max. working pressure [bar] Material Weight [g] Length [mm] Connection [Zoll] Order-No. 70 Town gas (C), Natural gas (M) and LPG (P), Hydrogen (H), 16 Oxygen (O), Compressed air (D) non-flammable gases Flashback resistant according to EN 730 10 combustion of Natural gas with air Brass Elastomer Bronze 1.255 1.414 1.590 1.679 137 146 149 160 G 3/4 G 1 G 1.1/4 G 1.1/2 123.009 123.012 123.014 123.015 70U 1.256 1.398 1.558 1.679 137 146 149 160 G 3/4 G 1 G 1.1/4 G 1.1/2 123.016 123.018 123.056 123.045 Other connections available on request Technical Data Product Information 137 - 160 mm (5.39 - 6.30 inch) WITT non-return valves for reliable protection against dangerous reverse gas flow. Every non-return valve 100% tested. 70 „² 137 - 160 mm (5.39 - 6.30 inch) Ø 62 mm (2.44 inch) 70U Ø 62 mm (2.44 inch) „²