... called check valve), more use in the pipe and water channels for water and wastewater treatment engineering , Used for excessive or ... 0.25mpa~2.0mpa(for 150LB)Media: watersuitable for Sea water, sewage, oilproduct descriptiondesign&manufacture standard:ASME,EN,DIN,ISOconnection type ... and wastewater treatment projects in various pipe and water channel as overflow, check effect, also can be applied to ...