Back to results
US 5,474,105 AGranted
Overrun control device
AssigneeThe Aro Corporation
InventorsStephen D. Able, Raymond D. Carter
Life of this patent
Estimating the term…
Abstract
A pneumatic fluid flow limiting device which is pressure compensated and resets automatically when the pneumatic fluid driven device is shut off. Pressure compensation is accomplished by a vented differential diameter chamber and reset is accomplished by a bypass orifice in a spool valve which further may be variable in flow to accommodate different flow requirements for tool operation.
Claims6
An overrun preventing device for limiting pressure fluid flow to a pressure fluid driven device comprising:
- a pressure fluid container having an inlet and an outlet with a passage therebetween;
- a piston disposed within said passage for reciprocal movement therein between a position permitting fluid flow and a position wherein said piston cooperates with a valve seat to obstruct the flow of fluid between said inlet and said outlet;
- said piston being urged towards said valve seat by said flow of pressure fluid against the force of a variable restoring means;
- piston bypass means for continuously bypassing at least a portion of said fluid flow;
- means for increasing the pressure fluid urging force on said piston;
- and
- said means for increasing the urging force comprising a labyrinth formed on the periphery of said piston.
4 more elements
Dependencies are inferred from the claim text.