| 摘要 |
The invention refers to the field of hydraulic control devices and refers to a saturation-proof hydraulic control device with two or more elements; each element is composed of a six-way, two-position spool ( 4 ) of the proportional type, a pressure compensator ( 3 ), also of the proportional type, notches on the spool for a correct operation and pressure selector members (MS) equipped with spring (M 7 ) that connect the various elements so that the work function at higher pressure sends the pressure to the spring side of its own pressure compensator ( 3 ), making it operate as check valve, and sending the pressure existing between spool ( 4 ) and pressure compensator ( 3 ) to the spring side of the compensators ( 3 ) of the other elements and to the pump (P). The spring (M 7 ) must generate a minimum load that is slightly greater than the pressure drop of the maximum flow-rate through the local pressure compensator ( 3 ).
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