Figure 25-DXH Oil-Controlled Swing Check Valve, Cast iron body with ANSI B.16.1 Class 125 or BS4504 PN10/16 flanges, bronze or stainless steel body seat, cast iron disc with renewable rubber disc seat stainless steel hinge shaft, external level and counterweight with side-mounted commercial steel hydraulic cylinder and closing speed control system. External surfaces and internal, non-machined ferrous surfaces shop coated with two-pack epoxy