Patent ID: 7100371
Filing Date: 2006-09-05
Classification: E02F,F15B

Abstract:
1. In a hydraulic arrangement including at least one pressure accumulator for hydraulic fluid, at least one hydraulic cylinder having at a first chamber and a second chamber to which pressure can be applied, a connecting line connecting said first chamber to said accumulator, and a control unit, the improvement comprising: a selector valve coupled to said first and second chambers and including a position for blocking fluid flow to and from said first chamber while establishing a drain passage for said second chamber; a normally closed shut-off valve being located in said connecting line and being connected for being actuated by said control unit; a signal transmitter coupled to said connecting line and to said control unit and being responsive to a pre-selected minimum pressure for supplying a signal to said control unit for actuating said shut-off valve to an open position, whereby a pressure drop in said connecting line will result in a loss of said minimum pressure which, in turn, will result in a loss of a signal being transmitted to said control unit by said signal transmitter, and consequently a loss in a control signal from said control unit to said shut-off valve.