FIELD: process engineering.
SUBSTANCE: invention relates to manual machines with dust suction device. Hans machine comprises dust collector. At least, one valve gate is arranged inside tube section at path of dust toward dust collector Said valve gate can displace between closed and open valve positions to open in direction of dust collector. Stop for valve gate to abut on in closed position extends inside tube section. Said stop extends along tube section at angle to flow direction to make reference line or contact surface whereon valve gate abuts in closed position.
EFFECT: optimised valve operation, ruled out dust backflow.
18 cl, 19 dwg
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