Patent ID: 7448595

Claim:
Shut-off instrument ( 1 ) for a flow medium, pressurized on both sides with an instrument housing ( 3 ) forming a flow channel ( 6 ) and a slide valve chamber ( 11 ) and with a soft sealing, multipart shut-off element ( 23 ) for sealing the flow channel ( 6 ), and with a slide stem ( 16 ) which penetrates a seal arrangement ( 14 ) and/or bearing arrangement ( 15 ) in a housing neck extension ( 12 ) delimiting the slide valve chamber ( 11 ) and which is rotationally connected to a stem nut ( 19 ) coupled to the shut-off element ( 23 ) by means of threaded engagement, and with a main body ( 28 ) provided with sealing elements ( 34 ), said main body ( 28 ) having at least one external dimension ( 29 ) that is slightly smaller than a nominal width ( 9 ) of the flow channel ( 6 ), wherein on opposite support surfaces ( 32 ) of the main body ( 28 ) ribs ( 33 ) projecting over its surfaces are arranged to form a matching structure for the engaged arrangement of the sealing elements ( 34 ), and the sealing elements ( 34 ) on the main body ( 28 ) are secured by support discs ( 40 ) arranged on opposite end faces ( 39 ) of the seal elements ( 34 ) by means of securing means ( 41 ) traversing the support discs ( 40 ), seal elements ( 34 ) and the main body ( 28 ) in bores ( 42 ).