HYDRAULICALLY-ASSISTED SUPPORT WITH THROTTLING DIRECTION CONTROL VALVE AND ENERGY RECOVERY Russian patent published in 2014 - IPC E21D23/16 

FIELD: mining.

SUBSTANCE: hydraulically-assisted support with a throttling direction control valve and energy recovery includes a hydraulic prop with a safety valve and a hydraulic lock, which are connected to its piston cavity, and a control hydraulic unit connected to delivery and drain main lines. Between piston cavity of hydraulic prop and delivery main line there installed is a throttling direction control valve consisting of a body with three holes, large, average and small pistons rigidly attached to each other with a stock, as well as four chambers formed with the above pistons. Chamber of small piston is connected through the lower hole to piston cavity of hydraulic prop, and through the side hole made so that it overlaps the small piston to the delivery main line. Chamber of large piston is connected through the upper hole to the delivery main line, and upper and lower adjacent chambers of average piston are connected to each other with a check valve and a throttle, which are installed on average piston.

EFFECT: improving operating reliability and accuracy of maintaining an operation mode of a hydraulic prop; recovery of hydraulic energy to a delivery main line.

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