US 2026/0298356 A1Published application

Null and maximum flow adjustable electrohydraulic servo vavle (ehsv)

AssigneeHoneywell International Inc.

InventorsSammuel Tillich, Anthony Rulli, Jonathan Meek

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Abstract

An electrohydraulic servo valve (EHSV) includes a spool valve body, a spool sleeve, a spool valve, a first null adjustment structure, a second null adjustment structure, a first maximum flow adjustment structure, and a second maximum flow adjustment structure. The spool sleeve is disposed within the valve body cavity and is movable relative to the spool valve body and along the axial axis. The spool valve is disposed within the spool sleeve and is moveable to a plurality of valve positions between a null position, a first maximum flow position, and a second maximum flow position. The first and second null adjustment structures are used to adjust a position of the spool sleeve, and the first and second maximum flow adjustment structures are used to adjust the first and second maximum flow positions, respectively.

Claims20

Dependent claims

An electrohydraulic servo valve (EHSV), comprising:

a spool valve body including at least a valve body first end, a valve body second end, and valve body inner surface, the valve body inner surface defining a valve body cavity that is symmetric about an axial axis;
a spool sleeve including at least a sleeve first end and a sleeve second end, the spool sleeve disposed within the valve body cavity and movable relative to the spool valve body and along the axial axis;
a spool valve disposed within the spool sleeve and moveable within the spool sleeve and along the axial axis, the spool valve moveable, in response to input stimuli, to a plurality of valve positions between a null position, a first maximum flow position, and a second maximum flow position;
a first null adjustment structure disposed within the valve body cavity and engaging the spool sleeve first end, the first null adjustment structure adjustably moveable relative to the spool valve body;
a second null adjustment structure disposed within the valve body cavity and engaging the spool sleeve second end, the second null adjustment structure adjustably moveable relative to the spool valve body;
a first maximum flow adjustment structure disposed within the valve body cavity and adjustably moveable relative to the spool valve body, the first maximum flow structure engaged by the spool valve when the spool valve is in the first maximum flow position;
and
a second maximum flow adjustment structure disposed within the valve body cavity and adjustably moveable relative to the spool valve body, the second maximum flow structure engaged by the spool valve when the spool valve is in the second maximum flow position,
wherein:
the first and second null adjustment structures are used to adjust a position of the spool sleeve, and
the first and second maximum flow adjustment structures are used to adjust the first and second maximum flow positions, respectively.

8 more elements

An electrohydraulic servo valve (EHSV), comprising:

a spool valve body including at least a valve body first end, a valve body second end, and valve body inner surface, the valve body inner surface defining a valve body cavity that is symmetric about an axial axis;
a spool sleeve including at least a sleeve first end and a sleeve second end, the spool sleeve disposed within the valve body cavity and movable relative to the spool valve body and along the axial axis;
a spool valve disposed within the spool sleeve and moveable within the spool sleeve and along the axial axis, the spool valve moveable, in response to input stimuli, to a plurality of valve positions between a null position, a first maximum flow position, and a second maximum flow position;
a torque motor actuator coupled to the spool valve body, the torque motor actuator adapted to receive command signals and configured, in response to the received command signals, to supply the input stimuli to the spool valve;
a first null adjustment structure disposed within the valve body cavity and engaging the spool sleeve first end, the first null adjustment structure adjustably moveable relative to the spool valve body;
a second null adjustment structure disposed within the valve body cavity and engaging the spool sleeve second end, the second null adjustment structure adjustably moveable relative to the spool valve body;
a first maximum flow adjustment structure disposed within the valve body cavity and adjustably moveable relative to the spool valve body, the first maximum flow structure engaged by the spool valve when the spool valve is in the first maximum flow position;
and
a second maximum flow adjustment structure disposed within the valve body cavity and adjustably moveable relative to the spool valve body, the second maximum flow structure engaged by the spool valve when the spool valve is in the second maximum flow position,
wherein:
the first and second null adjustment structures are used to adjust a position of the spool sleeve, and
the first and second maximum flow adjustment structures are used to adjust the first and second maximum flow positions, respectively.

9 more elements

An electrohydraulic servo valve (EHSV), comprising:

a spool valve body including at least a valve body first end, a valve body second end, and valve body inner surface, the valve body inner surface defining a valve body cavity that is symmetric about an axial axis;
a spool sleeve including at least a sleeve first end and a sleeve second end, the spool sleeve disposed within the valve body cavity and movable relative to the spool valve body and along the axial axis;
a spool valve disposed within the spool sleeve and moveable within the spool sleeve and along the axial axis, the spool valve moveable, in response to input stimuli, to a plurality of valve positions between a null position, a first maximum flow position, and a second maximum flow position;
a groove formed within the spool valve;
a feedback spring having a first end and a second end, the first end adapted to be coupled to an actuator, the second end at least partially disposed within the groove;
a first null adjustment structure disposed within the valve body cavity and engaging the spool sleeve first end, the first null adjustment structure adjustably moveable relative to the spool valve body;
a second null adjustment structure disposed within the valve body cavity and engaging the spool sleeve second end, the second null adjustment structure adjustably moveable relative to the spool valve body;
a first maximum flow adjustment structure disposed within the valve body cavity and adjustably moveable relative to the spool valve body, the first maximum flow structure engaged by the spool valve when the spool valve is in the first maximum flow position;
and
a second maximum flow adjustment structure disposed within the valve body cavity and adjustably moveable relative to the spool valve body, the second maximum flow structure engaged by the spool valve when the spool valve is in the second maximum flow position,
wherein:
the first and second null adjustment structures are used to adjust a position of the spool sleeve, and
the first and second maximum flow adjustment structures are used to adjust the first and second maximum flow positions, respectively.

10 more elements

Dependencies are inferred from the claim text.