FIELD: mining machine building ; applicable in hydraulic systems of control of hydraulic power cylinders of mining, road-building machines and excavators. SUBSTANCE: hydraulic system has hydraulic pump, hydraulic unit of distributors with pressure, return and relief lines for connection to head end and rod end of hydraulic power cylinders, OR hydraulic value connected with head ends of hydraulic power cylinders, hydraulic reservoir with safety valve connected to pressure line between pump and hydraulic unit of distributors. Safety valve is made with control cavity connected via OR hydraulic valve to head end of hydraulic power cylinders, with valve pressed to seat by spring with help of adjusting screw and piston. It has pusher with limiter installed for possible additional pressure of spring to increase pressure of valve operation. EFFECT: provided operation of various functional groups of actuating mechanism with use of one safety hydraulic valve allowing increase of working pressure of hydraulic fluid for separated ends of hydraulic power cylinders. 1 dwg
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