Product Name: Double-Door Resilient Seat Wafer Check Valve
Type: Double-Door Resilient Seat Wafer Check Valve
Sizes: DN150, 150 mm, 6 Inch
End Connection: DIN PN6 / PN10 / PN16, ANSI B16.5 Class 150 LB
Body Material: Ductile Iron
Disc Material: DI
Shaft Material: SS 420
Seat Material: EPDM
Spring Material: SS 304


Source: https://www.landeevalve.com/double-disc-check-valves-di-6-in-150-lb-resilient-seated.html