Fuel nozzle with reduced flow tolerance
AssigneeWoodward, Inc.
InventorJimroy A. McCormack
Life of this patent
Estimating the term…
Abstract
A fuel nozzle metering valve that includes a spool having an inlet port and an outlet flow port, and a retainer assembled to one end of the spool. A valve liner houses a portion of the spool. The spool is configured to move back and forth within the valve liner. The metering valve is biased in a closed position in which the outlet flow port is disposed entirely within the valve liner. The valve is opened when the spool slides within the valve liner such that some portion of the outlet flow port extends beyond an end of the valve liner. The retainer has a stepped portion configured to abut an end of the retainer at a fuel flow pressure below the expected maximum fuel flow pressure to be used in the fuel nozzle metering valve.
Claims14
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;
- 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 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.
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;
- 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 on the spool 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 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 check valve.
Dependencies are inferred from the claim text.