FIELD: machine building.
SUBSTANCE: invention relates to machine building and can be used as a device for control of flow of working agent pumped through pipeline. Piston device for controlling working agent flow, which is installed in pipeline, comprises drive 1 and body with round passage section, inside of which there is a diaphragm mechanism, diagram mechanism comprises cam ring 18, base ring 19 and lobes assembly, comprising a plurality of intermediate rings 20, connected to each other by means of support rods 21, a plurality of sliding rods 22, and a plurality of lobes made in the form of arc-shaped plates 23, oriented along circumference in plane and stepwise along helical spiral in volume of through section of nozzle device, as well as required kinematic connections between them.
EFFECT: invention is aimed at creation of reliable and process during operation of choke device for smooth adjustment of diameter of its flow section and simultaneous centering of working medium flow pumped through pipeline, in particular through wellhead production valve of oil and gas well or through pulp duct.
9 cl, 11 dwg
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