US 12,736,068 B2Granted

Transfer valve with dual authority control porting

AssigneeHamilton Sundstrand Corporation

InventorsWayne Johnson, Michael Ferrarotti

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Abstract

Apparatus and associated methods relate to a transfer valve with dual authority control porting. The transfer valve has a hydraulic cylinder having a cylindrical wall extending between first and second ends. The cylindrical wall has hydraulic ports therethrough for facilitating operation of the transfer valve. Within the hydraulic cylinder, a bilaterally moveable spool is axially moveable between first and second positions. The bilaterally moveable spool defines hydraulic chambers within the hydraulic cylinder. In the first position, the hydraulic chambers and the hydraulic ports form a fluidly conductive path between a first source and a first application, and another between a second source and a second application. In the second position, the cavities and the hydraulic ports form a fluidly conductive path between the first source and the second application, and another between spool positioning cavities of the transfer valve and the first application.

Claims20

Dependent claims

A hydraulic transfer valve with fail-safe positioning capability, the transfer valve comprising:

a hydraulic cylinder having a cylindrical wall extending between first and second ends;
the cylindrical wall having a plurality of hydraulic ports therethrough including a pair of spool-controller ports, a pair of actuator-controller ports, and a pair of hydraulic-actuator ports;
and
a bilaterally moveable spool axially moveable between first and second positions within the hydraulic cylinder, the bilaterally moveable spool having a plurality of sealing lands, integrally formed, which are configured to provide hydraulic seals with an interior surface of the cylindrical wall, thereby defining a plurality of hydraulic chambers within the hydraulic cylinder including a pair of spool-positioning chambers at ends of the bilaterally moveable spool, each of the pair of spool-positioning chambers in fluid communication with a corresponding one of the pair of spool-controller ports,
wherein:
the plurality of hydraulic chambers is configured to provide fluid communication between each of the pair of hydraulic-actuator ports and a corresponding one of the pair of actuator-controller ports in response to the bilaterally moveable spool being moved to the first position,
the plurality of sealing lands configured to isolate each of the pair of hydraulic-actuator ports from a corresponding one of the pair of spool-controller ports in response to the bilaterally moveable spool being moved to the first position, and
the plurality of hydraulic chambers is further configured to provide fluid communication between each of the pair of hydraulic-actuator ports and the corresponding one of the pair of spool-controller ports in response to the bilaterally moveable spool being moved to the second position.

5 more elements

A hydraulic system comprising:

a hydraulic actuator configured to control position of a kinematic device;
an actuator controller configured to control position of the hydraulic actuator, thereby controlling the position of the kinematic device;
a transfer-valve controller;
and
a transfer valve including:
a hydraulic cylinder having a cylindrical wall extending between first and second ends;
the cylindrical wall having a plurality of hydraulic ports therethrough including a pair of spool-controller ports in hydraulic communication with the transfer-valve controller, a pair of actuator-controller ports in hydraulic communication with the actuator controller, and a pair of hydraulic-actuator ports in hydraulic communication with the hydraulic actuator;
and
a bilaterally moveable spool axially moveable between first and second positions within the hydraulic cylinder, the bilaterally moveable spool having a plurality of sealing lands configured to provide hydraulic seals with an interior surface of the cylindrical wall, thereby defining a plurality of hydraulic chambers within the hydraulic cylinder including a pair of spool-positioning chambers at ends of the bilaterally moveable spool, each of the pair of spool-positioning chambers in fluid communication with a corresponding one of the pair of spool-controller ports,
wherein:
the plurality of hydraulic chambers is configured to provide fluid communication between each of the pair of hydraulic-actuator ports and a corresponding one of the pair of actuator-controller ports in response to the bilaterally moveable spool being moved to the first position;
the plurality of sealing lands is configured to isolate each of the pair of hydraulic-actuator ports from a corresponding one of the pair of spool-controller ports in response to the bilaterally moveable spool being moved to the first position, and
the plurality of hydraulic chambers is further configured to provide fluid communication between each of the pair of hydraulic-actuator ports and a corresponding one of the pair of spool-controller ports in response to the bilaterally moveable spool being moved to the second position.

10 more elements

Dependencies are inferred from the claim text.