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

Claim 16:
17. A fuel nozzle metering valve, comprising:
a spool having an inlet port and a flow control port;
a retainer assembled to one end of the spool;
a valve liner which houses a portion of the spool, the spool configured to move back and forth within the valve liner and the flow control port disposed on a perimeter portion of the spool at an end of the valve liner, the valve liner defining a plurality of projections arranged cylindrically with a plurality of equally spaced gaps separating the plurality of projections;
wherein the metering valve is biased in a closed position in which the flow control port is disposed entirely within the valve liner, wherein the valve is opened when the spool slides out of the valve liner such that some portion of the flow control port extends beyond an end of the valve liner to allow fuel to flow from the flow control port where the gaps are situated, the retainer having a stepped portion 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 metering 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.