... The Function of Non-Return Valve. Visual Adjustable Auto Filling Valve, Water Heating Systerm, Refrigeration, Air Conditioner and ... Max. pressure inlet :10barPressure adjustment ranges: 0.3-4barPre-filling pressure:1.5barMax. temperature:80°CConnection: G 3/4" ... material: H59 brass Seal material: NBR rubber The automatic filling valve consist in pressure reducing valve, stainless steel filter, ...