Anti-saturation directional control valve composed of two or more sections with pressure selector compensators

Abstract

The invention relates to the field of hydraulic directional control valves and refers to an anti-saturation directional control valve (V) composed of two or more sections in each of whom there is a pressure selector compensator with a six-way two-position spool (4) of the proportional type and a compensator (3) performing the function of pressure compensator. The pressure compensator (3) comprises therein a pressure signal selector (S), that is mechanically kept open or not by a piston (5) with a spring (M), of a negligible force, depending on workport pressures. The piston (5) presses against the pressure compensator (3) in the section (E) of the directional control valve (V) that is at a higher pressure, in this case operating as check valve, while in the sections at lower pressure the piston (5) is kept detached from the pressure compensator (3) so that this latter one performs its function of pressure compensator and the inner signal selector (S) by means of the sphere action.

Dependencies are inferred from the claim text.