IGR BIFUNCTIONAL VALVE Russian patent published in 2013 - IPC F16K5/12 F16K47/04 

FIELD: machine building.

SUBSTANCE: bifunctional valve includes a housing with inlet and outlet branch pipes with feedthrough holes and eight throttling elements in the housing. Four of the above mentioned throttling elements are fixed, and four other are equipped with a drive, balanced and arranged between fixed elements with possibility of being moved in direction of feedthrough hole axis. Each moving throttling element on the side of contact to fixed throttling element is equipped with a flat seal with length of not less than movement value of moving throttling element from OPEN position to CLOSED position.

EFFECT: improving operating reliability of a valve due to seals between moving and fixed throttling elements.

3 dwg