Flow limiting duct vent valves and gas turbine engine bleed air systems including the same

Patent metadata

Field	Value
Publication number	US-10227929-B2
Application number	US-201514881562-A
Country	US
Kind code	B2
Filing date	Oct 13, 2015
Priority date	Oct 13, 2015
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

Embodiments of a flow limiting duct vent valve (DVV) are provided, as are embodiments of a bleed air system including a flow limiting DVV. In one embodiment, the bleed air system a flow limiting DVV and a first valved device, such as a high pressure regulator. The DVV includes, in turn, a housing assembly having an inlet and an outlet. The inlet is fluidly coupled to the valved device when the bleed air system is installed on a gas turbine engine. A valve element is mounted in the housing assembly and, during operation of the DVV, moves from: (i) the closed position to an open vent position when the pressure differential across the valve element exceeds a first threshold, and (ii) from the open vent position to an overpressure shutoff position when the pressure differential across the valve element exceeds a second threshold greater than the first threshold.

First claim

What is claimed is:

1. A bleed air system for installation on a gas turbine engine, the bleed air system comprising:
a first valved device; and
a flow limiting Duct Vent Valve (DVV), comprising:
a housing assembly having an inlet and an outlet, the inlet fluidly coupled to the first valved device when the bleed air system is installed on the gas turbine engine;
a poppet slidably mounted in the housing assembly and normally residing in a closed position, the poppet moving from: (i) the closed position to an open vent position when a pressure differential across the valve element exceeds a first threshold, and (ii) from the open vent position to an overpressure shutoff position when the pressure differential across the valve element exceeds a second threshold greater than the first threshold;
a first spring disposed within the housing assembly and biasing the poppet toward the closed position when the poppet is in the closed position; and
a second spring disposed within the housing assembly, mechanically disengaged from the poppet in the closed position, and engaging the poppet to act in parallel with the first spring as the poppet moves toward the overpressure shutoff position.

2. The bleed air system of claim 1 wherein the first valved device comprises a high pressure regulator.

3. The bleed air system of claim 2 further comprising a secondary regulator, the flow limiting DVV fluidly coupled between an outlet of the high pressure regulator and an inlet of the secondary regulator when the bleed air system is installed on the gas turbine engine.

4. The bleed air system of claim 1 wherein the poppet comprises:
a poppet head having a first face and a second, opposing face; and
an elongated poppet shaft extending from the poppet head.

5. The bleed air system of claim 4 wherein the flow limiting DVV further comprises:
an inlet seat within the housing assembly and contacted by the first face when the poppet is in the closed position; and
a shutoff seat within the housing assembly and contacted by the second, opposing face when the poppet is in the overpressure shutoff position.

6. The bleed air system of claim 5 wherein the inlet seat has a first diameter, and wherein the shutoff seat has a second diameter greater than the first diameter.

7. The bleed air system of claim 1 further comprising a spring cavity in which the first spring and the second spring are located, the spring cavity partially defined by an outer circumferential surface of the poppet and fluidly isolated from air flowing through the flow limiting DVV when the poppet is in the open vent position.

8. The bleed air system of claim 1 further comprising a flow passage formed in the poppet and through which air passes when flowing from the inlet to the outlet.

9. The bleed air system of claim 1 wherein the poppet further moves from the overpressure shutoff position to the open vent position when the pressure differential across the valve element falls below a third threshold less than the first threshold.

10. The flow limiting DVV of claim 1 further comprising a duct fluidly coupling the first valved device to the flow limiting DVV; and
wherein, when in the overpressure shutoff position, the poppet blocks airflow through the flow limiting DVV to prevent additional venting of airflow from the duct when the pressure differential across the valve element exceeds the second threshold.

11. The flow limiting DVV of claim 1 further comprising a spring seat contained in the housing assembly and configured to slide therein, the spring seat contacting the second spring;
wherein the second spring engages the poppet through the spring seat as the poppet moves toward the overpressure shutoff position.

12. The flow limiting DVV of claim 1 wherein the first spring is substantially coaxial with and is nested within the second spring.

13. A flow limiting Duct Vent Valve (DVV), comprising:
a housing assembly having an inlet and an outlet
a valve element slidably mounted in the housing assembly and normally residing in a closed position, the valve element moving from: (i) the closed position to an open vent position when a pressure differential across the valve element surpasses a first threshold, and (ii) from the open vent position to an overpressure shutoff position when the pressure differential across the valve element surpasses a second threshold greater than the first threshold;
a first spring disposed within the housing assembly and biasing the valve element toward the closed position when the valve element is in the closed position; and
a second spring disposed within the housing assembly, mechanically disengaged from the valve element in the closed position, and engaging the valve element to act in parallel with the first spring as the valve element moves toward the overpressure shutoff position.

14. The flow limiting DVV of claim 13 wherein the valve element-comprises:
a dual faced poppet head; and
an elongated poppet shaft extending from the dual faced poppet head in a direction opposite the inlet.

15. The flow limiting DVV of claim 14 further comprising a flow passage extending through the elongated poppet shaft and through which pressurized air flows when the poppet is in the open vent position.

16. The flow limiting DVV of claim 14 further comprising:
an inlet seat contacted by a first face of the dual faced poppet head in the closed position; and
a shutoff seat contacted by a second, opposing face of the dual faced poppet head in the overpressure shutoff position.

17. The flow limiting DVV of claim 16 wherein the inlet seat has a first diameter, and wherein the shutoff seat has a second diameter greater than the first diameter.

Assignees

• Honeywell Int Inc

Inventors

• Schlarman Chris
• Reavis Adriel
• Velasquez Raul

Classifications

• F02C9/18 Primary

  by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages {(F02C3/113 takes precedence)} · CPC title

• F16K15/026

  the valve member being a movable body around which the medium flows when the valve is open · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F16K17/30

  spring-loaded · CPC title

• F02C3/04

  having a turbine driving a compressor (power transmission arrangements F02C7/36; control of working fluid flow F02C9/16) · CPC title