SERVO VALVE Russian patent published in 2017 - IPC F15B13/43 

FIELD: machine engineering.

SUBSTANCE: first stage functions as a stage of control, and the second stage functions as an amplifier stage. The second stage has a valve block and a sleeve of a pilot spool with a lateral surface located in it. The lateral surface and/or the other part of the sleeve of the pilot spool is provided with a flow channel for transmitting the control flow and/or the volume flow. The pilot spool is movably located in the sleeve of the pilot spool. One of the flow channels is formed by means of a slot in the sleeve surface of the pilot spool which partially or wholly does not extend in the circumferential direction of the sleeve of the pilot spool.

EFFECT: simplified and reliable in operation design, cost of manufacture, costs can be significantly reduced.

11 cl, 4 dwg