HYDRAULIC DRIVE PROTECTION SYSTEM Russian patent published in 2017 - IPC F15B20/00 

FIELD: machine engineering.

SUBSTANCE: system includes a shut-off device that is located in a housing provided with inlet, outlet, drainage pipe connections with channels and a stop. A spring-loaded plunger with inlet cavity is located inside the shut-off device body, in which there is an annular groove with radial holes made along the plunger outer surface. Thje plunger is arranged in the housing with formation of outlet cavity communicating with outlet pipe connection channel. The inlet cavity of the plunger communicates with the outlet cavity of the housing by means of an axial channel having a conical seat which is overlapped by spring-loaded rod conical valve during its free movement in the stop through hole. In the open position between the seat and the valve there is a passage section. The valve which is a stop of the rod spring is provided with a cone with a bead. The plunger of the shut-off device is also provided with an elastic element. The stop of the shut-off device is provided with a cover that are connected together by a screw connection. The outer surface of the stop and the inner surface of the cover are made in form of hemispheres with formation of airtight cavity therebetween that is intended to be filled with gas and to absorb the shock wave energy in case of hydraulic impact during valve operation. The outer surface of the stop is provided with a membrane made of elastic material such as rubber and is immovably connected to the valve of spring-loaded rod by means of threaded joint and protected from both sides with plates made of strong material such as steel or polymeric material to prevent damage thereof. There is a nipple on the stop cover for filling the airtight cavity.

EFFECT: simplified design of the protection system against unauthorized release of working fluid.

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