An adjustable trunnion valve, comprising: an obturator (104; 104'; 104") within a valve body; a valve stem coupled to the obturator (104; 104'; 104") and configured to rotate the obturator (104; 104'; 104") between an open position and a closed position; a first valve seal abutting against a first side of the obturator (104; 104'; 104");; and a trunnion assembly (116; 116'; 116") coupled to the obturator (104; 104'; 104"), and a second valve seal abutting against a second side of the obturator (104; 104'; 104") opposite the first side of the obturator (104; 104'; 104"), the trunnion assembly (116; 116'; 116") comprising: a fixed base (118; 118'; 118") secured to the valve body; and an adjustable extension (120; 120'; 120"); characterized in that the first valve seal and the second valve seal are angled toward each other, and in that at least one of the fixed base (118; 118'; 118"), the adjustable extension (120; 120'; 120"), and the obturator (104; 104'; 104") defines a protrusion (122; 122'; 122"), and at least one of the fixed base (118; 118'; 118"), the adjustable extension (120; 120'; 120"), and the obturator (104; 104'; 104") includes a member defining a recess (124; 124'; 124"), the protrusion (122; 122'; 122") positioned at least partially within the recess (124; 124'; 124") and abutting against a first end of the recess (124; 124'; 124") when the obturator (104; 104'; 104") is in the open position and against a second end of the recess (124; 124'; 124") when the obturator (104; 104'; 104") is in the closed position, wherein rotation of the valve stem beyond the open position and the closed position results in the protrusion (122; 122'; 122") rotating the member defining the recess (124; 124'; 124"), changing a length of the trunnion assembly (116; 116'; 116"), and vertically translating the obturator (104; 104'; 104") relative to the fixed base (118; 118'; 118"). an obturator (104; 104'; 104") within a valve body; a valve stem coupled to the obturator (104; 104'; 104") and configured to rotate the obturator (104; 104'; 104") between an open position and a closed position; a first valve seal abutting against a first side of the obturator (104; 104'; 104");; and a trunnion assembly (116; 116'; 116") coupled to the obturator (104; 104'; 104"), and a second valve seal abutting against a second side of the obturator (104; 104'; 104") opposite the first side of the obturator (104; 104'; 104"), the trunnion assembly (116; 116'; 116") comprising: a fixed base (118; 118'; 118") secured to the valve body; and an adjustable extension (120; 120'; 120"); characterized in that the first valve seal and the second valve seal are angled toward each other, and in that at least one of the fixed base (118; 118'; 118"), the adjustable extension (120; 120'; 120"), and the obturator (104; 104'; 104") defines a protrusion (122; 122'; 122"), and at least one of the fixed base (118; 118'; 118"), the adjustable extension (120; 120'; 120"), and the obturator (104; 104'; 104") includes a member defining a recess (124; 124'; 124"), the protrusion (122; 122'; 122") positioned at least partially within the recess (124; 124'; 124") and abutting against a first end of the recess (124; 124'; 124") when the obturator (104; 104'; 104") is in the open position and against a second end of the recess (124; 124'; 124") when the obturator (104; 104'; 104") is in the closed position, wherein rotation of the valve stem beyond the open position and the closed position results in the protrusion (122; 122'; 122") rotating the member defining the recess (124; 124'; 124"), changing a length of the trunnion assembly (116; 116'; 116"), and vertically translating the obturator (104; 104'; 104") relative to the fixed base (118; 118'; 118"). a fixed base (118; 118'; 118") secured to the valve body; and an adjustable extension (120; 120'; 120"); characterized in that