Description: Body: WCB, CI, SS304, SS316 Disc: WCB, CI, SS304, SS316 Diaphragm: EPDM, NBR Pilot Valve: Brass, Stainless Steel Spring: Stainless Steel Shaft: Stainless Steel Nominal Diameter: DN50 to DN200 Nominal Pressure: PN16 to PN64 End Connection: Flanged, Buttweld, Socketweld https://www.uaevalves.com/product-category/pressure-relief-and-sustaining-valve/