Patent ID: 8726786

Claim:
A stack valve having a bucket parallel movement function, comprising: an unloading path connected to a fluid pressure source, a tank path connected to a tank; a boom direction switching valve which is provided in a boom section and connected to the unloading path to control supply of a pressure fluid from the fluid pressure source to a boom cylinder; a bucket direction switching valve which is provided in a bucket section and connected to the unloading path to control supply of the pressure fluid from the fluid pressure source to a bucket cylinder; an ascending junction path which supplies the pressure fluid from a rod-side chamber of the boom cylinder to a head-side chamber of the bucket cylinder via the boom direction switching valve; an ascending dividing valve which is provided in a dividing section and connected to the ascending junction path to control a flow rate of the pressure fluid supplied to the head-side chamber of the bucket cylinder; an ascending branched path which is branched from the ascending junction path and connected to the unloading path or the tank path; a ascending cancellation switching valve which is provided in the dividing section and connected to the ascending branched path to open or close the ascending branched path; a descending junction path which supplies the pressure fluid from a head-side chamber of the boom cylinder to the rod-side chamber of the bucket cylinder via the boom direction switching valve; a descending dividing valve which is provided in the dividing section and on the descending junction path to control a flow rate of the pressure fluid supplied to the rod-side chamber of the bucket cylinder; a descending branched path which is branched from the descending junction path and connected to the unloading path or the tank path; and a descending cancellation switching valve which is provided in the dividing section and on the descending branched path to open or close the descending branched path, wherein, the descending dividing valve and the ascending dividing valve are arranged to be in parallel to each other, the ascending dividing valve is provided on one side of the dividing section whereas the descending dividing valve is provided on the other side of the dividing section, and the ascending cancellation switching valve is provided on the same axis as the descending dividing valve and in the one side of the dividing section.