Patent ID: 11946549
Assignee: WOODWARD, INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B  Y | IPC B  F

Claim 8:
9. A fuel nozzle check valve comprising:
a valve liner having an inlet port and an outlet flow port;
a spool disposed within the valve liner;
a retainer assembled to one end of the spool, the retainer having a stepped portion extending from a central region thereof, the stepped portion having an axial length configured to limit spool displacement at a specified flow and a fuel flow pressure to accurately set valve flow in a fixed geometry state;
wherein the valve liner houses a portion of the spool, the spool configured to move back and forth within the valve liner, wherein the valve liner includes a valve liner port in fluid communication with the outlet flow port when the check valve is in the open position; and
wherein the check valve is biased in a closed position in which the outlet flow port is blocked when the spool is disposed entirely within the valve liner, wherein the check valve is opened when the spool slides out of the valve liner such that the outlet flow port is not blocked by the spool, the stepped portion of the retainer configured to abut an end of the valve liner at a fuel flow pressure below the expected maximum fuel flow pressure to be used in the fuel nozzle check valve; and
wherein a dashpot is formed within the liner between the end of the valve liner on which the stepped portion of the retainer abuts and a flange formed on the outer surface of the spool.