Patent ID: 7861642

Claim:
A valve block for use in respect of a tool attachment of a working machine, where the tool attachment is adapted for connection to different kinds of hydraulically operated tools or implements with the aid of a hydraulically actuated locking device, the valve block comprising: first port means for connection to hydraulic lines of the working machine; second port means for connection to hydraulic coupling means adapted for coupling to hydraulic coupling elements of the tool or implement; and third port means for connection to the locking device, wherein the valve block also includes a system of lines which communicate with said port means and which include valve means, wherein said valve means are adapted to fulfill at least three of the following functions: a first function for ensuring the presence of hydraulic pressure in the locking device in the event of a fracture or a leakage in the hydraulic lines of the working machine; a second function which enables said first port means to be connected selectively to either said second port means or said third port means; a third function for obtaining post-tensioning of the locking device when the first port means are connected to said second port means; a fourth function for relieving load prior to connecting and disconnecting the hydraulic connection of the working tool; and a fifth function for achieving pressure limitation of the locking device.