Start working at differential pressure, the UW series valve has a completely range of solenoid valves from 1/8" to 2". UW series valve is among the oldest history valves, we have stainless steel valve and brass valve for your reference, both of SS valve and brass valve can be normal close valve and normal open valve. This series solenoid valves are most popular valves used for many conditions especially in the water treatment system.2W500-50Working medium : air,water,oil,gasMotion Pattern :  Direct Drive TypeType : Normal Close Type / Normal Open TypeAperture of Flow Rate : 50mmCv Value : 48Joint Pipe Bore : 2"Operation Fluid Viscosity : below 20 CSTWorking Pressure : Water/Oil :0~5 kgf/cm2 , Air /Gas:0~7 kgf/cm2Max.Pressure Resistance : 10.5 kgf/cm2Operating Temperature Range : -5~80°CVoltage: DC12V,DC24V,AC24V,AC36V,AC110V,AC220V,AC380VVoltage Range : ±10%Material of Body : BrassMaterial of Oil Seal : NBR , EPDM , VITON