Patent ID: 8511329

Claim:
A method of installing a metering valve assembly in a fuel control, the method comprising: inserting a metering valve sleeve into a metering valve section of a fuel control housing, the metering valve sleeve comprising inlet window set and an outlet window set, the outlet window set comprising a first outlet window having a first logarithmic contour and a second outlet window having a second logarithmic contour, wherein a ratio of an inner width of the first outlet window to an inner length of the first outlet window is between 1.48 and 1.52, and a ratio of an inner width of the second outlet window to an inner length of the second outlet window is between 2.21 and 2.29; and arranging a metering valve spool within the metering valve sleeve, the metering valve spool comprising a first cylindrical portion, a second cylindrical portion, and a third cylindrical portion formed between the first and second cylindrical portions, wherein the first cylindrical portion and the second cylindrical portion have a substantially equal first diameter, the third cylindrical portion has a second diameter, and a ratio of the first diameter to the second diameter is between 2.52 and 2.63, and the metering valve spool is arranged to establish a diametral clearance of 0.0003 and 0.0006 inches (0.000762-0.001524 cm) between an inner diameter of the metering valve sleeve and the first diameter.