Patent ID: 6199585
Filing Date: 2001-03-13
Classification: F15B,H01F,Y10T

Abstract:
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; anda 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.