FIELD: hydraulic drives designed for building-up pressure in pressure welding of plastic pipes. SUBSTANCE: hydraulic drive has electric motor connected with pump; slide-valve hydraulic distributor whose working cavities are communicated with hydraulic cylinder, with one cavity being communicated through check valve, which is followed by hydraulic accumulator and pressure recorder. Installed in pump pressure line is controlled safety valve. Output shaft of hydraulic distributor slide valve has bores engageable with balls through pushers with spring-loaded gate of check valve and electric motor switch installed for check valve, between ball and pusher in bushing is member on which U-shape fork rests to embrace with clearance slide valve output shaft. In this case, fork is engageable through ball with rod of controlling member. EFFECT: higher reliability of claimed hydraulic drive. 2 dwg
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