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

FIELD: engines and pumps.

SUBSTANCE: system includes a hydraulic tank, a pump, a pressure line, a drain line in the hydraulic tank, a hydraulic distributor, a hydraulic motor, a locking device consisting of a casing equipped with inlet, outlet, drainage connections with channels and stop. Inside the body of the locking device, a spring-loaded plunger with an inlet cavity is disposed. Plunger is located in the body at a distance of its full stroke- with the formation between the plunger and the end face of the outlet cavity face. An annular groove and radial apertures are provided along the outer surface of the plunger. The inlet cavity communicates with the exit cavity of the body by means of an axial channel that is closed by a spring-loaded plunger with the ability to freely move it through the through-hole of the stop forming a cavity. Both plungers are spring-loaded by elastic elements. At the same time one of the ends of the plunger is made conical with the collar, which is the spring stop. In the stop, a channel is provided that communicates the exit cavity of the locking device with the high-pressure line located between the orifice of the locking device and the hydraulic distributor.

EFFECT: simplifying the design of the hydraulic drive safety system against unauthorized discharge of the working fluid.

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