HYDRAULIC DRIVE Russian patent published in 1999 - IPC

FIELD: hydraulic drive for hydraulic systems of mobile and stationary installations operating at variable and low temperatures. SUBSTANCE: hydraulic drive has pump, suction line, slide with valves and by-pass lines. Valves have stop springs and may be made tubular, in the form of crown with narrowing bimetal lobes which may be deformed by thermal treatment. Through window on cylindrical part of each valve is positioned for coincidence with related by-pass line. One by-pass line is connected with suction line and other by-pass line is in communication with tank. EFFECT: simplified construction, enhanced reliability in operation and improved compactness. 1 dwg