TWO-LOCK VALVE Russian patent published in 2020 - IPC F16K11/10 

FIELD: valve industry.

SUBSTANCE: two-lock valve relates to valve industry, in particular, to two-lock valves operating in power plants characterized by complex operating conditions, high reliability requirements, maximum restrictions of mass and dimensions characteristics, for example, in nuclear power plants for transport purposes, as a localizing shutoff element on steam pipelines of the second circuit. Technical result is achieved due to that in two-lock valve containing housing, installed in housing coaxial seats and interacting with them main and additional locking members, connected with coaxially located external and internal rods, connected with drives, wherein connection of additional locking element to outer rod is sealed by elastic shell, for example bellows, connection of additional locking element with external rod is supplemented with support ring contacting with spherical surface of end face of intermediate sleeve projection, rigidly and hermetically fixed on outer rod, wherein outer guide surface of intermediate sleeve is made in contact with internal bore of additional locking member, and on end of internal bore of external rod there is a sealing seat interacting with sealing band on inner stock, thus forming additional upper seal of valve – along internal stock.

EFFECT: higher reliability of two-lock valve.

5 cl, 1 dwg