DOUBLE-CLOSURE VALVE Russian patent published in 2021 - IPC F16K11/10 

FIELD: engineering elements.

SUBSTANCE: invention relates to pipeline fittings operating as part of power units characterized by difficult operating conditions, high reliability requirements and maximum restrictions on weight and size characteristics, for example, as part of nuclear power units for transport purposes, as a localising closure element on secondary steam pipelines. The double-closure valve comprises a body with an axial and a lateral branch pipes and two sealing seats, a main and an additional closure elements connected with coaxially aligned inner and outer stems sealed by a stuffing box and controlled by independent drives. The main closure member is equipped with an unloading mechanism comprised of an inner sealing seat guide, a sealing band on the inner stem, a support nut and an elastic element, wherein grooves are made on the inner surface of the main closure member, a passage is made through the support nut and the main closure member in the area of the sealing seat, and there is a cavity between the inner surface of the main closure member and the outer surface of the additional closure member providing passage of the medium into the lateral branch pipe.

EFFECT: technical result is increased reliability of the valve in emergency situations.

4 cl, 3 dwg