US 12,392,361 B1
Cross-bleed safety mechanism for a linear hydraulic actuator
Sachin Ramprashad, West Hartford, CT (US); and Ryan Prescott Susca, Windsor, CT (US)
Assigned to Hamilton Sunstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Apr. 29, 2024, as Appl. No. 18/649,445.
Int. Cl. F15B 13/04 (2006.01); F16K 11/07 (2006.01)
CPC F15B 13/0402 (2013.01) [F16K 11/07 (2013.01); F15B 2211/329 (2013.01); F15B 2211/7053 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cross-bleed safety mechanism for protecting a hydraulic system, the cross-bleed safety mechanism including:
a hydraulic cylinder having first and second hydraulic ports configured to provide fluid communication with extend and retract chambers, respectively, of a linear hydraulic actuator when hydraulically coupled thereto; and
a bilaterally moveable spool within and providing a hydraulic seal with an interior surface of the hydraulic cylinder, the bilaterally moveable spool located between a first chamber in fluid communication with the first port and a second chamber in fluid communication with the second port, wherein the bilaterally moveable spool:
blocks first and second hydraulic bypass channels in response to the bilaterally moveable spool being at an equilibrium position, the first and second hydraulic bypass channels selectively provide fluid communication between first and second chambers,
blocks the second hydraulic bypass channel and begins to unblock the first hydraulic bypass channel in response to a first differential pressure between the first and second chambers exceeding a first differential cracking pressure, and
blocks the first hydraulic bypass channel and begins to unblock the second hydraulic bypass channel in response to a second differential pressure between the second and first chambers exceeding a second differential cracking pressure.