SAFETY DRAINING VALVE Russian patent published in 2021 - IPC F16K17/10 F16K31/385 

FIELD: valve engineering.

SUBSTANCE: invention relates to valve engineering and can be used for protection of warm or cryogenic vessels and reservoirs from overpressure. The technical result is achieved by the fact that the main valve is made in form of two bodies, wherein located in the first body are inlet and outlet branch pipes for the working medium and a seat, a shut-off valve with a stem, connected with an internal and an external bellows placed in the second body and connected with the body, wherein the inter-bellows cavity is connected with the outlet branch pipe and the effective area of the inner bellows is selected on the condition of obtaining a force ensuring tightness of the gate of the shut-off valve, and the auxiliary valve is made of three bodies, wherein the first body is connected to the inlet and outlet branch pipes of the first body of the main valve and a bellows with a spring and a stem with two stops are installed therein, wherein placed on the stem between the stops are a spring and a working medium discharge valve provided with a stem seal, and the second body of the auxiliary valve is connected to the inlet branch pipe of the main valve and installed therein is a valve for supplying the working medium into the third body located between the valve seats and connected to the cavity between the outer bellows and the second body of the main valve.

EFFECT: invention allows simplifying the structure and improving reliability of a safety draining valve.

1 cl, 1 dwg