Patent ID: 8511330
Filing Date: 2013-08-20
Classification: F02C,G05D,Y10T

Abstract:
1. A method of installing a servo minimum pressure valve assembly in a fuel control, the method comprising: inserting a servo minimum pressure valve sleeve into a servo minimum pressure valve section of a fuel control housing, the servo minimum pressure valve sleeve comprising: an inlet aperture, a first window set, a second window set, and a third window set, wherein a ratio of an outlet window diameter of the first window set to an outlet window diameter of the second window set is between 2.34 and 2.65, and the outlet window diameter of the second window set is greater than an outlet window diameter of the third window set; arranging a servo minimum pressure valve spool within the servo minimum pressure valve sleeve, the servo minimum pressure valve spool comprising a limiting lip and a cylindrical portion, the servo minimum pressure valve spool arranged to establish a diametral clearance of 0.0003 and 0.0005 inches (0.000762-0.00127 cm) between an inner diameter of the servo minimum pressure valve sleeve and an outer diameter of the cylindrical portion of the servo minimum pressure valve spool; and coupling a resilient member to the servo minimum pressure valve spool in the servo minimum pressure valve section of the fuel control housing, the resilient member forcing the limiting lip of the servo minimum pressure valve spool into contact with the limiting lip of the servo minimum pressure valve sleeve.