Patent ID: 7156013

Claim:
A hydraulic cylinder for operating a valve of a turbine, comprising: a cylinder housing and a piston guided therein, the piston rod of which is in operative connection with a valve element of said valve, and which is biased with the aid of a spring into a home position, and comprising a control valve through which a pressure chamber of said hydraulic cylinder may be subjected to pressure medium or connected with a tank (T), as well as a quick-action stop valve whereby said pressure chamber may be connected with said tank for rapid pressure reduction, wherein said control valve and said quick-action stop valve are arranged on a control block, wherein said control block and said cylinder housing are combined into a block having at least two approximately diametrically arranged lateral surfaces on which said control valve and said quick-action stop valve, respectively, are attached wherein a passage of said block communicating with a work port (B) of aid control valve is connected with an annular passage encircling a bush wherein said piston rod is guided, into which annular passage a passage leading to an inlet port (A) of said quick-action stop valve and to said chamber opens.