TWO-STOP VALVE Russian patent published in 2021 - IPC F16K1/44 F16K11/10 

FIELD: valve engineering.

SUBSTANCE: invention relates to valve engineering, in particular to valves of power plants, characterized by difficult operating conditions. The two-stop valve consists of a body with inlet and outlet nozzles, the main and additional shut-off elements interacting with the coaxial sealing seats of the body and kinematically connected to the drives. The actuators provide independent movement of the shut-off elements through the coaxially located inner and outer rods, equipped with a stuffing box seal and a thrust head. The two-stop valve is equipped with additional sealing elements that duplicate the stuffing box seals. A sealing element in the form of a bellows is installed in the upper part of the outer rod. The upper end of the bellows is rigidly and hermetically fixed to the body, and the lower end is fixed to the outer rod with the possibility of joint movement with the rod. A sealing band is made at the lower end of the thrust head of the outer rod. The specified sealing collar interacts with a sealing seat located on the inner surface of the additional closure member.

EFFECT: invention is aimed at eliminating the direct effect of the pressure of the working medium on the stuffing box seals of the outer and inner rods. This makes it possible to increase the tightness of the valve relative to the external environment, and, consequently, to increase the reliability of the two-stop valve.

3 cl, 4 dwg