Directional-control valve
AssigneeMannesmann Rexroth GmbH
InventorsWerner Reith, Binh Nguyen Xuan
Life of this patent
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Abstract
A directional control valve has an axially displaceable control piston inside a valve housing and a travel sensor arranged on the valve housing to detect the position of the control piston. The sensor includes a travel sensor tube which is pressure tight and sealed on one end and has a directional transmitter rod extending into the other end. The directional transmitter rod is secured to the control piston and extends through the area connecting the inside of the valve housing to the travel sensor tube. A seal exposes a dampening gap placed in the connecting area forming a throttle point enabling oil to flow into the travel sensor tube.
Claims14
A directional control valve, comprising:
- a valve housing having an interior chamber and a passage;
- a control piston axially displaceable in said interior chamber;
- a travel sensor mounted on said housing to detect positions of said control piston, said travel sensor having a travel sensor tube and a directional transmitter rod, said sensor tube being connected to said interior chamber through said passage, being sealed pressure-tight at one end thereof and having an opening at a second end thereof, said transmitter rod being telescopically displaced in said opening, being fixedly coupled to said control piston and extending in a direction of axial displacement thereof through said passage;
- and
- a seal in said passage between said interior chamber and said opening of said travel sensor tube, said seal controlling opening dimensions of a dampening gap and forming a throttle point allowing oil flow into said travel sensor tube, said seal including a check valve blocking oil flow into said travel sensor tube.
Dependencies are inferred from the claim text.