Spring sealed pneumatic servo valve
AssigneeHamilton Sundstrand Corporation
InventorsPiotr Kozlowski, Piotr Sawicki
Life of this patent
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Abstract
A servo valve for an actuator is described. The servo valve comprises a housing having a plurality of ports, a sleeve disposed within the housing, the sleeve comprising an axis (A), an inner surface defining a cavity for the servo valve and a plurality of metering holes, each in communication with one of the ports, and a metering rod extending axially in the cavity for reciprocation along the axis to meter flow through the metering holes. The servo valve additionally comprises a first spring seal extending between the metering rod and the sleeve to close off a first end of the cavity and a second spring seal extending between the metering rod and the sleeve to close off a second, opposite end of the cavity.
Claims20
A servo valve for an actuator, the servo valve comprising:
- a housing having a plurality of ports;
- a sleeve disposed within the housing, the sleeve comprising an axis (A), an inner surface defining a cavity for the servo valve and a plurality of metering holes, each in communication with one of the ports;
- a metering rod extending axially in the cavity for reciprocation along the axis to meter flow through the metering holes;
- a first spring seal extending between the metering rod and the sleeve or housing to close off a first end of the cavity;
- and
- a second spring seal extending between the metering rod and the sleeve or housing to close off a second, opposite end of the cavity.
A method of making a servo valve comprising:
- forming a plurality of ports in a housing;
- forming a sleeve for location within the housing, the sleeve comprising an axis (A), an inner surface defining a cavity for the servo valve and a plurality of metering holes, each in communication with one of the ports;
- introducing a metering rod axially into the cavity for reciprocation along the axis to meter flow through the metering holes;
- connecting a first spring seal to one or both of the metering rod and the sleeve to close off a first end of the cavity;
- connecting a second spring seal to one or both of the metering rod and the sleeve to close off a second, opposite end of the cavity;
- and
- sliding the sleeve within the housing.
Dependencies are inferred from the claim text.