FIELD: mechanical engineering. SUBSTANCE: front head drive hydraulic circuit contains pump plant mounted on tank, safety valve, pressure gauge, hydraulic distributor interconnected by pipelines forming operating hydraulic system setting into operation working cylinder and reverse cylinder under action of working liquid under pressure, for instance, mineral oil. Cylinders are installed on bedframe of hydraulic stretcher and are mechanically connected with front head. Hydraulic circuit is furnished with overflow valve installed in working cylinder line, backup pump plant connected by pipelines with backup safety valve, pressure gauge, hydraulic distributor, thus forming backup hydraulic system connected to working cylinder and reverse cylinder in parallel with operating hydraulic system through shut-off valves, and safety valve installed between shutoff valve and reverse cylinder. EFFECT: improved reliability. 2 dwg
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