A ball valve (like the butterfly valve and plug valve are one of the family of valves called quarter turn valves) is a valve that opens by turning a handle attached to a ball inside the valve. The ball has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you "see"the valve's position.
ASME Pressure Classes: 150, 300, 600, 800, 900, 1500, 2500 Lb
Sizes: 1/2, 3/4, 1-1/4, 1-1/2, 2, 2-1/2, 3, 3-1/2, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20 in ( DN 25 ~ 500 mm )
Ends: Welded, threaded and flanged.
ball: Floating, Trunnion Mounted; Side entry, top entry;
seal: Metal to Metal (Metal Seated); Rubber Seated (Soft Seated); PTFE Seated
Materials: Carbon steel, stainless steel, alloy steel.