FOUR-PORT THREE-POSITION HYDRAULIC VALVE WITH REDUNDANT ELECTRIC CONTROL Russian patent published in 2011 - IPC F15B13/43 

FIELD: machine building.

SUBSTANCE: hydraulic valve consists of case with channels of hydraulic feed supply and working cavity channels, of electro-hydraulic valve, of hydraulic compensator with isolating valve, of two-stage-electro-fluid amplifier of "nozzle-gate" type, of damping throttle, and of two replenishing and two safety valves. The hydraulic valve is equipped with six-port two-position annular flow valve with a slide of small length with internal channels and a throttle orifice in a collar of the slide. The valve shuts off a drain channel of the electro-hydraulic amplifier from a draining hydraulic line running to the hydraulic compensator and simultaneously it communicates it with a drain through the throttle orifice in the collar of the slide when the working cavity channels operate under the mode of annular flow. Also, the valve totally communicates the drain channel of the electro-hydraulic amplifier with the drain hydraulic line to the hydraulic compensator and cuts off the throttle orifice in the collar of the slide from the drain channel of the electro-hydraulic amplifier under the control mode.

EFFECT: raised reliability, simplified design, and reduced dimensions and weight of hydraulic valve.

2 dwg