Passive bleed valves with adjustable pressure threshold

Patent metadata

Field	Value
Publication number	US-11346356-B2
Application number	US-202117193235-A
Country	US
Kind code	B2
Filing date	Mar 5, 2021
Priority date	Aug 3, 2018
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A bleed valve includes a housing with an inlet coupled to an outlet by a duct, a guide tube with an orifice fixed in the housing between the inlet and the outlet, a piston, and baffle. The piston is slideably supported on the guide tube and is movable between an open and a closed position, the duct fluidly coupling the inlet and outlet in the open position, the duct fluidly separating the inlet and outlet in the closed position. The orifice fluidly couples the inlet and outlet in the open and closed positions to move piston between the open and closed positions according to differential pressure between the bleed valve inlet and outlet. The baffle is slideably supported by the guide tube to set the differential pressure at which the piston moves between the open and closed positions. Gas turbines and differential pressure adjustment methods are also described.

First claim

What is claimed is:

1. A method of setting a differential pressure at which a bleed valve opens, comprising:
at the bleed valve having a housing with an inlet coupled to an outlet by a duct, a guide tube with an orifice fixed in the housing between the inlet and the outlet, a piston slideably supported on the guide tube and movable between an open position and a closed position, and a baffle slideably supported by the guide tube to set a set differential pressure at which the piston moves between the open position and the closed position;
setting the set differential pressure between the inlet and the outlet of the bleed valve at which the piston moves between the open position and the closed position;
moving the piston to the closed position when an operating differential pressure rises above the set differential pressure such that the duct fluidly separates the inlet from the outlet; and
moving the piston to the open position when the operating differential pressure drops below the set differential pressure such that the duct fluidly couples the inlet to the outlet.

2. The method as recited in claim 1 , wherein movement of the piston between the open position and the closed position is passive.

3. The method as recited in claim 1 , wherein setting the set differential pressure comprises rotating a set pin connecting the baffle to the housing.

4. The method as recited in claim 1 , wherein setting the set differential pressure comprises changing flow area of the orifice.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Defelice Robert
• Simpson Scott W
• Kamp Josh

Classifications

• F04D27/0215 Primary

  Arrangements therefor, e.g. bleed or by-pass valves · CPC title

• F02C6/08

  the gas being bled from the gas-turbine compressor · CPC title

• F02C9/18

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

• F02C7/26

  Starting; Ignition · CPC title

• F01D17/105 Primary

  by passing part of the fluid · CPC title