HYDRAULIC SYSTEM FOR COMPRESSED NATURAL GAS FILLING, AND CONTROL METHOD OF GAS FILLING Russian patent published in 2013 - IPC F17C5/06 F17D1/04 

FIELD: machine building.

SUBSTANCE: hydraulic system for CNG filling includes a hydraulic power unit, a control unit and at least one CNG supply unit. Hydraulic power unit includes a hydraulic fluid storage tank at normal pressure and a closed circuit pump for injection of compressed hydraulic fluid to CNG supply unit. Closed circuit pump includes the first and the second branch pipes for hydraulic fluid and a diverted plate for control of operating modes of the first and the second branch pipes for hydraulic fluid. In addition, hydraulic power unit includes a cross-over valve for variation of position of the diverted plate, feed pipeline, by means of which the first and the second above mentioned branch pipes for hydraulic fluid are connected to the tank, the first hydraulic pipeline connected between the first branch pipe for hydraulic fluid and the first pipeline for filling and return of hydraulic fluid of the system, and the second hydraulic pipeline connected between the second branch pipe for hydraulic fluid and the second pipeline for filling and return of hydraulic fluid of the system.

EFFECT: reduction of energy consumed by a hydraulic pump.

25 cl, 3 dwg