ELECTROHYDRAULIC POWER AMPLIFIER WITH MECHANICAL FEEDBACK AROUND SPOOL VALVE POSITION Russian patent published in 2009 - IPC F15B9/03 F15B3/00 

FIELD: engines and pumps.

SUBSTANCE: invention relates to machine building. Electrohydraulic amplifier comprises housing with pressure discharge channels and cavity channels, three-collar cylindrical spool valve, pressure seat and power spring of mechanical feedback. Aforesaid spring is ball-coupled with spool valve in the groove of its central collar, while its rigid rod is fixed in electromechanical converter armature. Electrohydraulic amplifier comprises two-collar cylindrical pocket, and tapered channels extending via one of the pocket collar surfaces to pressure nozzle, each from its hole. These holes communicate, via housing hydraulic lines, the pocket tapered channels with appropriate spool valve sub face chambers. On feeding electric control signals to electromechanical converter, armature of the latter turns through certain angle to make aforesaid pocket moving by semi spheres built in mechanical feedback spring rigid rod and fitted in aforesaid groove between pocket collars.

EFFECT: higher reliability.

2 dwg