FIELD: obtaining tightness due to building up necessary contact pressure between members being sealed. SUBSTANCE: shut-off member includes inlet and outlet passages, seat, circular sealing member and seal. Sealing member is made from fluoroplastic film which is pressed to seat by means of clamping bush fitted for forming minimum circular clearance between clamping bush and seal in area of its contact with fluoroplastic film. Circular clearance does not exceed thickness of fluoroplastic film. EFFECT: enhanced stability of hydrodynamic properties of shut-off member. 3 cl, 1 dwg
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