FIELD: valving. SUBSTANCE: valving member constructed as a flexible hose, which is turned inside out and has perforation holes of different diameters, is mounted inside the housing and interacts with the drive. One end of the hose is tightly secured to the housing over periphery. The other end of the hose is connected with the driving mechanism constructed as a driving drum mounted inside the housing. The free end of the hose is wound on the drum. EFFECT: enhanced reliability. 1 dwg
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