CONTROL VALVE Russian patent published in 2011 - IPC F16K1/12 F16K1/42 

FIELD: machine building.

SUBSTANCE: control valve consists of case 1 with cover 2 and inlet 3 and outlet 4 flanges, of gate 5 in form of movable bush with packing, of worm drive 6, of seat 7 with packing for gate 5. Seat 7 is equipped with external 8 and intermediate 9 disks positioned at distance one from another on inlet side. Facing each other surfaces of disks 8 and 9 are made in form of labyrinths 10. Surface of external disk 8 on the side of inlet at maximal diameter of circumference is equipped with a collar-funnel 11 with area approaching area of cross section of internal diameter of gate 5. External disk 8 has through orifices 12 connecting inlet with space between disks 8 and 9. Dimension of internal diameter of gate 5 facilitates a minimal allowed gap with external diameter of disks 8 and 9.

EFFECT: increased reliability and service life by raised degree of protection from erosion wear of throttling part of gate-seat.

1 dwg