FIELD: shutting-off pipe lines carrying superclean aggressive media. SUBSTANCE: device has housing, shut-off member, labyrinth seal in form of circular bores made from material possessing yield properties. Labyrinth seal is made on working surface of shut-off members; rings made from flexible material are fitted in bores of labyrinth seal. Definite relationship is provided among structural components. EFFECT: enhanced reliability of sealing; simplified construction. 2 dwg
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|
RU2151940C1 |
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RU2186754C2 |
| ROTAMETER | 1994 |
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RU2081397C1 |
