INDIRECT ACTION SAFETY DEVICE FOR HYDRAULIC SYSTEMS Russian patent published in 2022 - IPC F15B13/01 F16K17/10 F16K47/04 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, in particular, to safety devices of hydraulic systems and volumetric hydraulic drives. Device comprises a body with an inlet and outlet holes and a main valve seat, a main valve shutoff and control element installed in the body cavity to form a control chamber, in which a cylindrical coil compression spring is installed, which presses the shutoff-control element of the main valve to the seat, wherein in the main valve shutoff and control element a throttling channel is made, which communicates the main valve inlet opening with the main valve control chamber, and an auxiliary valve, including a shutoff and control element, pressed to a seat having an inlet, a spring installed in the valve cavity, screw regulating the pressure setting, at the same time the outlet of the auxiliary valve is interconnected with the drain. At that, valve is equipped with bellows located in control chamber inside spring, wherein the open end of the bellows is attached to the seat of the auxiliary valve to form a cavity communicated with the inlet of the auxiliary valve, and in the closed end facing the throttling channel there is a throttle hole, wherein the main valve body is made in the form of a bushing, the auxiliary valve seat is made in the form of a stepped disk installed and fixed with a retaining ring in the bushing, and the auxiliary valve body is connected by a threaded connection to the auxiliary valve seat.

EFFECT: invention is aimed at reducing pressure surge and oscillation in the safety device of indirect action while maintaining overall dimensions.

1 cl, 2 dwg