HYDRAULIC SYSTEM DEPRESSURISATION AUTOMATIC MACHINE Russian patent published in 2014 - IPC F15B20/00 

FIELD: machine building.

SUBSTANCE: hydraulic system depressurisation automatic machine is intended for automatic switching off of hydraulic drive systems at operational equipment. The device comprises two casings with chambers where two pistons with rods are installed with clearance. The casings are provided with inlet and outlet holes communicating the chambers with respectively a pressure pipeline, a drain and pressure hydraulic lines of double-cavity and single-cavity hydraulic engines. Additionally the hydraulic system depressurisation automatic machine comprises a drain line sensor with a piston and a rod being also set in its casing, and a blocking unit for the drain line sensor rod comprising a casing in the cavity of which a cylindrical spring-loaded plunger with at least two stages of different diameter is mounted. The cavity of the blocking unit casing is communicated with a feedback line, and the stage of larger diameter of the said plunger mechanically interacts with the first rod of the third movable piston in one of the extreme plunger positions. Each movable piston is equipped with two conical surfaces and at least one cylindrical surface.

EFFECT: expanded process functionality and raised reliability of leakproofness control of the whole hydraulic system.

1 dwg