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A 1-inch full bore ball valve matches the pipe bore closely to reduce pressure loss, though the exact opening varies by manufacturer and model.
For the full breakdown, see our best Ball Valve 1-Inch guide.
Reduced-port ball valves cut the opening down a full pipe size and add pressure drop exactly where a system needs flow. Checking the bore chart before you choose a ball valve 1 inch full bore keeps that loss near zero, because the ball’s opening is meant to match the pipe’s inner diameter. The same 1-inch NPT connection can flow very differently depending on which valve you install.
What Does Full Bore Actually Mean On A 1-Inch Valve?
Full bore (also called full port) means the ball’s internal opening closely matches the pipe’s inner diameter instead of stepping down like a standard or reduced-bore valve does. The practical payoff is minimal pressure loss across the valve, which matters for pumps, high-flow lines, and any pipe that gets cleaned by pigging. A quarter turn of the handle switches it from fully open to fully closed, which is why ball valves dominate shutoff duty in tight spaces.
“1 inch” is the nominal