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

Claim 0:
1. A fuel nozzle metering valve comprising:
a spool having an inlet port and a flow control port;
a one-piece retainer assembled to one end of the spool, the one-piece 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;
a valve liner which houses a portion of the spool, the spool configured to move back and forth within the valve liner;
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, the stepped portion configured to abut an end of the valve liner at the fuel flow pressure, which is 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.