1.Item:Umbrella Valve 2.Material:Silicone,FKM,FVMQ,NBR,EPDM 3. ... 5-30MM 4.Opening presure:0.3-55kPa Silicone Umbrella Valve ItemSilicone Umbrella ValveBrandRAMISCountry of OriginXiamen, ChinaItem No.All ModelUmbrella ... trough seat thickness.FunctionAct as backflow prevention devices or one-way valves or check valves.Application Used as vessel vent ... , DIN, SAE,VDA6.1, UL, FDA, JIS . Umbrella Valve