FIELD: machine building.
SUBSTANCE: unit consists of guiding element with packing surface and first guiding surface. The unit of the control element is equipped with a control element installed inside a fluid medium channel. The unit of control element consists of conjugated surface adapted to form a packing together with packing surface of the guiding element and of the second guiding surface size of which is chosen to facilitate a sliding contact with the first guiding surface of the guiding element. An auxiliary cavity is formed at least in the guiding element or in the unit of the control element; this cavity adjoins the first and the second guiding surfaces and is designed to collect separated solid material.
EFFECT: raised reliability due to prevention of destruction of packing formed between sealing and conjugated surface.
5 cl, 5 dwg
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