Locking system of a double-acting hydraulic jack, a circuit comprising such a system and method of implementation of such a circuit and the application of the upturn of a plow reversible

摘要

Hydraulic piston (51) blocking system comprises a valve (1) which can be in three different states. In first state the hydraulic fluid flows from the second opening (4) liked to the distributor (53) towards the first opening (3) communicating with the first chamber (50) of the piston. In second state the fluid can not flow through the valve and in third state the fluid flows in the opposite direction. The changes from a state to the other are controlled by pressure variations. Independent claims are also included for the hydraulic circuit with two pistons, the method of controlling the circuit, method of returning a plough, plough and tractor.