Hydraulic lock D function :A-B direction, hydraulic oil to overcome the spring force, push the ball, direct flow past. In the direction of B-A, the steel ball falls on the valve ZD seat, and the oil does not flow past. It needs to access the control oil with pressure in the X port. The control oil ACTS on the control plunger to push the plunger forward.

The essence of hydraulic lock is composed of two hydraulic control check valves.

Liugong grader accessories hydraulic lock, as the name suggests, is a "lock", is to lock the loop, do not let the loop oil flow, as shown in the figure, to ensure that the cylinder in the figure can keep its weight position static even if there is a certain external load.

The specific structure of the hydraulic control one-way valve is a one-way valve with a hydraulic control port. There are seat, ball, spring, hydraulic port, control plunger, and A,B,X three oil ports.

Use model：grader4180