DIGITAL HYDRAULIC PRESSURE CONTROLLER WITH ELECTROMAGNETIC DRIVE Russian patent published in 2012 - IPC F16K31/02 

FIELD: machine building.

SUBSTANCE: controller consists of a body, in the boring of which a bushing is located. Delivery and drainage channels and a channel to an operating member are supplied to the boring. Inside the boring the spring-loaded spool is located with the possibility of axial movement. The controller has two electromagnets, coaxially arranged at the ends of the spool. Electromagnets allow the spool to get locked in three positions. In one extreme position the pressure head is supplied to the channel of the operating member. In the other extreme position the drain pressure is applied. In the intermediate position the two working clamps of the spool block with a negative blockage the pressure and drainage channels, reducing head pressure in the channel to the operating member up to a value determined by the spring force acting on the spool.

EFFECT: simple hydraulic circuit, reducing complexity, increasing reliability.

3 dwg