Patent ID: 9399953
Filing Date: 2016-07-26
CPC Classification: F02C,F16K,Y10T

Claim Text:
1. A pump sharing valve for a gas turbine engine fuel system comprising: a housing having multiple ports; a sleeve arranged in the housing and including an inlet window and first, second and third windows axially spaced apart from one another; and a spool slidably received in the sleeve and including a spool diameter and first and second cylindrical portions, the first cylindrical portion selectively connecting the inlet window to the second and third windows, and the second cylindrical portion selectively connecting the inlet window to the first window, the spool movable between first and second positions relative to the first, second and third windows to regulate flow, the first and second cylindrical portions respectively including first and second widths, a first ratio corresponding to the first width to the spool diameter, and a second ratio corresponding to the second width to the spool diameter, the first ratio is between 1.83 and 1.93, and the second ratio is between 1.22 and 1.32, wherein the spool includes a spool surface that engages a sleeve surface in a valve position, the first and second cylindrical portions arranged at first and second distances from the spool surface, a third ratio corresponding to the first width to the first distance, a fourth ratio corresponding to the second width to the second distance, the third ratio between 0.38 and 0.48, and the fourth ratio between 2.05 and 2.15.