Abstract: The valve comprises a hollow body (36, 37, 40) provided with a first inlet or outlet opening (38) and a second outlet or inlet opening (41) for a hydraulic fluid, and the following elements:(a) a hollow slide (58) slidably mounted inside a hollow sleeve (56) slidably mounted in the body and coaxial with the slide (58);(b) an elastic element (61) bearing against the body (40) and biasing the slide into abutment against an annular end of the sleeve and the sleeve (56) into abutment against an annular seat (58) of the body;(c) and the annular bearing section (59) of the slide (58) on the sleeve (56) is less than the annular bearing section (57) of the sleeve on its seat (58), the sleeve being moreover provided with apertures (66) communicating with the first opening (38).This valve avoids deterioration of the suspension of a heavy vehicle travelling at high speed over uneven ground.