FIELD: machine building.
SUBSTANCE: invention relates to the powder material feeding device (1) intended for powder material feeding into liquid, with consists of an inlet opening (2), an outlet opening (3), passage (4) for feeding of the powder material from the inlet opening (2) to the outlet opening (3), first valve (20), and also a gaseous medium feeding device (30) with an outlet (34) for gaseous medium feeding into the passage (4) for powder material, an outlet opening (34) is located in the passage (4) for powder material feeding downstream the first valve (20). The invention also relates to the method of powder material feeding into liquid comprising the following stages: (a) creation of rarefaction or negative pressure in liquid, (b) powder material feeding into liquid through pass (4) for powder material feeding, (c) first valve assembly (20) in the passage (4) for powder material feeding for the purpose of closing and opening of the passage (4) for powder material feeding, and also (d) gaseous medium feeding (50) by pressure into the passage (4) for powder material feeding downstream the first valve (20), at least, partially during closing and/or opening of the first valve (20).
EFFECT: inventions provide increase of service life of the device.
16 cl, 8 dwg
