FIELD: machine building.
SUBSTANCE: invention relates to machine building. Proposed design comprises first seal (412) and second seal (414) arranged opposite the first one. First and second seals contact tightly with valve shutoff element (316) and sealing surface located at shutoff element opposite side. First seal or second seal comprises spring (418) arranged inside shell (420) to be pressed against sealing surface and shutoff element. Spacer washing (416) is arranged between first and second seals to prevent the contact there between. Extra spacer washing (416) is fitted in place so that it does not contact with shutoff element and sealing surface.
EFFECT: perfected design.
19 cl, 5 dwg
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