FIELD: mining.
SUBSTANCE: invention relates to mining and can be used as a mandrel for a compression bypass valve. Mandrel comprises: a first cylinder comprising: a longitudinal axis located along the longitudinal dimension of the first cylinder, and a radial ball bearing support; second cylinder is installed with possibility of sliding relative to the first cylinder, besides, the second cylinder contains: groove located along circumference of the second cylinder. Groove has length in longitudinal measurement, at that groove interacts with raceway for balls of bearing so that: first cylinder rotates relative to second cylinder. At that, the first cylinder moves in longitudinal direction relative to the second cylinder at the distance equal to the groove length.
EFFECT: higher efficiency of the valve.
1 cl, 38 dwg
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