FLOW HYDRAULIC CONTROL SYSTEM FOR USE WITH DUAL HYDRAULIC DRIVE, SERVO DRIVE CONTROL SYSTEM AND METHOD OF KEEPING UP STANDBY FLOW CONTROL MEANS FOR HYDRAULIC DRIVE Russian patent published in 2008 - IPC F15B20/00 B64C13/42 

FIELD: mechanics, hydraulics.

SUBSTANCE: hydraulic system, servo drive system and method are intended keep up a standby flow control means for hydraulic or service drives. Flow regulators include a plug, an adjusting slide valve. In normal operating conditions every overflow adjusting slide valve is motionless relative to the plug, and the flow regulator functions as a four-position hydraulic flow regulator. Each flow regulator is connected with the overflow-shut-off valve containing an overflow slide valve moving from the shut-off to overflow positions. Given an interruption of pressure feed into flow regulator, the overflow slide moves in the overflow position reducing pressure in corresponding drive piston chambers. In the case of jamming of the primary adjusting slide valve, a corresponding overflow adjusting slide valve moves inside plug allowing the overflow groove to switch pressure in system of regulation over into the return line, that reducing pressure in corresponding drive piston.

EFFECT: increase in reliability of a hydraulic flow control system.

38 cl, 9 dwg