| 摘要 |
<p>The present invention provides a control device intended to equip a hydraulic distributor comprising at least one slide valve sliding in a body comprising, on the one hand, a connection to a supply of fluid under pressure, on the other hand, two outlets or utilisation points connected, for example, one to the main chamber, the other to the annular chamber of a doubleacting ram, each utilisation point being provided with a nonreturn valve opposing the return of fluid to the distributor, when the slide valve is inoperative, each valve comprising an obturating axial end able to bear against a seat which constitutes the orifice of a first chamber located beyond the valve, according to the position of the slide valve, this first chamber being either closed or connected to a pipe for the return of fluid to the reservoir, the outer diameter of the valve seat being less than the diameter of an outer cylindrical surface of this valve sliding in a bore in the distributor body, the outlet or utilisation point proper being constituted by a second chamber provided in the distributor body between one end of said bore and the valve seat and characterised in that a rear chamber, opening into which is the end of the valve opposite the obturating end, is connected to a second groove of a small distributor comprising a slide valve, which also comprises a first groove connected to the second chamber located close to the valve seat, a third groove open to the fluid reservoir, a fourth groove connected to the control chamber adjacent the large distributor, whereas finally the end of the small slide valve located beyond the fourth groove opens in facing relationship to an orifice connected to the control pipe corresponding to said control chamber such that an introduction of fluid into the control chamber may take place through this pipe only at the same time as an axial displacement of the small slide valve against an opposing return force.</p> |
