US 12,331,879 B2
Blowdown valve with air-oil separation
Laslo Diosady, Etobicoke (CA); and Daniel Alecu, Brampton (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on Jun. 14, 2022, as Appl. No. 17/839,912.
Prior Publication US 2023/0400149 A1, Dec. 14, 2023
Int. Cl. B01D 19/00 (2006.01); F16N 23/00 (2006.01)
CPC F16N 23/00 (2013.01) [B01D 19/00 (2013.01); F05D 2260/602 (2013.01); F05D 2260/609 (2013.01); F16N 2210/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A blowdown valve for an aircraft engine lubrication system, the blowdown valve comprising:
a valve body defining:
a chamber;
an inlet for receiving a mixture of air and lubricating fluid into the chamber;
a first outlet for releasing a first portion of the mixture out of the chamber; and
a second outlet for releasing a second portion of the mixture out of the chamber, the second outlet being disposed downstream of the first outlet relative to the inlet; and
a valve member disposed inside the chamber of the valve body, the valve member being translatable along an axis between:
a valve-closed position where the valve member hinders fluid flow through the inlet; and
a valve-open position corresponding to a downstream translation limit of the valve member where:
fluid flow is permitted through the inlet;
fluid flow is permitted from the inlet to the first outlet and through the first outlet;
fluid flow is permitted from the inlet to the second outlet and through the second outlet by flowing radially outwardly around and past the valve member; and
the valve member is disposed between the inlet and the second outlet.