On-line verifiable trip and throttle valve actuator
AssigneeWoodward, Inc.
InventorJohn Been
Life of this patent
Estimating the term…
Abstract
The subject matter of this specification can be embodied in, among other things, a fluid actuator system including a fluid actuator having a housing having an inner wall defining an interior cavity, a piston having a piston head configured for reciprocal movement within the interior cavity, the piston head contacting the inner wall and dividing the interior cavity into a first fluid chamber and a second fluid chamber, a first valve configured to control fluid flow between the first fluid chamber and a bypass conduit, and a second valve configured to control fluid flow between the bypass conduit and the second fluid chamber.
Claims8
A fluid actuator comprising:
- an inner cylindrical housing having a first end, a second end opposite the first end, and a first inner wall;
- a piston comprising a piston head configured to fluidically seal against the first inner wall and configured to move axially along a portion of the first inner wall;
- an outer cylindrical housing arranged at least partly about the inner cylindrical housing, the outer cylindrical housing having a third end, a fourth end opposite the third end, and a second inner wall;
- an annular cavity defined between the outer cylindrical housing and the inner cylindrical housing;
- a first moveable plate configured to fluidically seal against the second inner wall and configured to move axially along a first portion of the second inner wall between the first end and the third end, configurably seal against the first end in a first configuration such that the piston head, the first inner wall, and the first moveable plate define a first fluid chamber, and configurably unseal the first end in a second configuration such that fluid flow is permitted between the first fluid chamber and the annular cavity;
- and
- a second moveable plate configured to fluidically seal against the second inner wall and configured to move axially along a second portion of the second inner wall between the second end and the fourth end.
Dependencies are inferred from the claim text.