Slow response solenoid hydraulic valve, and associated systems and methods
AssigneeSafran Landing Systems Canada Inc.
InventorsMarin Besliu, Anthony Carr
Life of this patent
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Abstract
Hydraulic valves for dampening pressure spikes and associated methods are disclosed herein. In one embodiment, a hydraulic valve for dampening pressure spikes includes: a spool configured to move axially inside the hydraulic valve; and a sleeve configured to at least partially house the spool. A location of the spool with respect to the sleeve may determine a flow of a working fluid through the hydraulic valve. A viscous damper is at least partially housed inside an opening in the spool, and a viscous friction between the viscous damper and the opening in the spool slows a motion of the spool.
Claims15
A hydraulic valve for dampening pressure spikes, comprising:
- a spool configured to move axially inside the hydraulic valve;
- a sleeve configured to at least partially house the spool, wherein a location of the spool with respect to the sleeve determines a flow of a working fluid through the hydraulic valve;
- and
- a viscous damper at least partially housed inside an opening in the spool, wherein the viscous damper comprises a self-centering feature configured to align the viscous damper with an axial direction of the spool, wherein the self-centering feature comprises a round end seated against correspondingly round end shaped surface of an end cap, wherein the viscous damper is generally round, wherein the viscous damper includes at least one axial non-circumferential groove that only partially extends along an axial direction of the viscous damper thus increasing a clearance between the viscous damper and the opening in the spool, wherein the groove is located entirely within a space that lies between the viscous damper and the opening in the spool, and wherein an entire length of the groove is parallel with a main longitudinal center axis of the valve,
- wherein a viscous friction between the viscous damper and the opening in the spool slows a motion of the spool.
A method for dampening pressure spikes, comprising:
- providing a pilot fluid at a predetermined pressure to a hydraulic valve;
- in response to the pressure of the pilot fluid, axially moving a spool within a sleeve;
- counteracting a motion of the spool by viscous friction of a viscous damper that is at least partially housed inside an opening in the spool, wherein the viscous damper comprises a self-centering feature configured to align the viscous damper with an axial direction of the spool, wherein the self-centering feature comprises a round end seated against correspondingly round end shaped surface of an end cap, wherein the viscous damper is generally round, wherein the viscous damper includes at least one axial non-circumferential groove that only partially extends along an axial direction of the viscous damper thus increasing a clearance between the viscous damper and the opening in the spool, wherein the groove is located entirely within a space that lies between the viscous damper and the opening in the spool, and wherein an entire length of the groove is parallel with a main longitudinal center axis of the valve;
- and
- in response to axially moving the spool, providing a path for a working fluid through the hydraulic valve.
Dependencies are inferred from the claim text.