HYDRAULIC DRIVE PROTECTION SYSTEM Russian patent published in 2018 - IPC F15B20/00 

FIELD: machine building.

SUBSTANCE: system comprises a hydraulic tank, a pump connected by a pressure pipe with a hydraulic motor through the distributor, a drain line to the hydraulic tank and a locking device installed in the pressure pipe, containing a housing with an outlet cavity connected to the distributor, an inlet, an outlet and a drain connections with channels, a spring-loaded plunger with a groove for the installation of a spring and the inlet cavity connected with the pump, with an axial channel connected with the outlet cavity, the annular groove and radial openings, a spring-loaded valve located in the outlet cavity and configured to overlap the axial channel of the spring-loaded plunger and a stop, wherein the movable stem of the spring-loaded valve is freely movable in the stop. A hydraulic seal is placed in the stop, it is made in the form of an annular cavity combined with a through hole of the stop connected with the outlet cavity of the locking device by a channel. The annular cavity of the hydraulic seal is located between two elastic sealing rings. At the end face of the spring-loaded plunger of the locking device, a groove for disposing a spring is provided for returning the spring-loaded plunger to the starting position, and also moving the plunger to the stop.

EFFECT: increased efficiency of the hydraulic drive protection system against unauthorized discharge of hydraulic fluid from the hydraulic system.

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