Di Nicola manufactures Swing check valves in carbon steel ASTM 216 WCB / GP 240GH + N and stainless steel with high nickel content alloys for conditions of extreme corrosion from over fifty years with dimensions between 40 and 1600 mm and pressures nominal 2.5 bar to 100 bar according to EN and ASME pressure classes from 125 PSI to 900 PSI . With the construction according to API 600 and ASME B16.34 , API 598 Test second , size flanges according to ASME B16.5 , EN 1092-1 and ISO 7005 and spacings between flanges according to DIN 3202 , EN 558-1 , ANSI B16.10 , ends weld ASME B16.25 . The company Di Nicola produces non-standard at the request of customers