Patent ID: 7182097

Claim:
An anti-saturation directional control valve (V) comprising: two or more sections with a pressure selector compensator, each section (E 1 , E 2 , E 3 ) comprising i) a six way, three-position spool ( 4 ) of a proportional type, ii) a compensator ( 3 ) that performs a function of pressure compensator, the compensator inserted in a bore and comprising a pressure signal selector (S) with a sphere located inside the compensator ( 3 ), iii) a piston ( 5 ) inserted in the same bore as the compensator ( 3 ), and iv) a spring (M) that operates on said piston ( 5 ), wherein, a. a section workport provides a workport pressure that operates on the piston ( 5 ), on the spring (M) side, the workport pressure being taken off from a first point ( 1 ) between the compensator ( 3 ) and the work port, the pressure upstream of the compensator ( 3 ) operates on a side ( 3 a ) of the compensator ( 3 ) itself, such pressure being taken off from a second point ( 2 ), namely between spool ( 4 ) and pressure compensator ( 3 ), while a load sensing signal pressure operates between piston ( 5 ) and compensator ( 3 ), b. the pressure signal selector (S) is kept mechanically open or not by the piston ( 5 ) with spring (M) depending on the pressure on the workports, c. in a section with higher pressure the piston ( 5 ) push against the compensator ( 3 ) and the group composed of compensator ( 3 ) and piston ( 5 ) operates as check valve and the selector (S) kept open by the piston ( 5 ), connects the pressure signal in the second point ( 2 ), between spool ( 4 ) and compensator ( 3 ), to a line (C) of the load sensing signal.