CONTROL MEMBER HYDRAULIC DRIVE CONTROL SYSTEM Russian patent published in 2009 - IPC F01D17/26 

FIELD: engines and pumps.

SUBSTANCE: proposed drive is designed to be used in hydraulic turbine control systems to turn blades of guide vane, wheel rotor blades etc. Hydraulic control valves convert electric signals into working fluid flow rate proportional to them to control the response of control members. Input control signals for hydraulic control valves represent electric signals generated by automatic controllers and their plunger stroke signals. Circuit of connection between two control proportional hydraulic valves and non-return valve varies working fluid rate at the said circuit outlet with minimum or maximum observed in departure of the said valves from the position whereat their flow rate equals zero. Proposed system comprises outlet of the 1^st hydraulic control valve coupled with the inlet of the 2^nd hydraulic control valve, namely to its secondary flow direction, and, via non-return valve of the primary flow direction, with the outlet of 2^nd hydraulic control valve. Note here that the other outlets of hydraulic control valves communicate with working fluid lines as required.

EFFECT: higher reliability.

2 cl, 5 dwg