Pipeline cutoff device

In a cutoff device for pipelines having a housing, a flexible closure strip which can be unrolled onto a valve seat wall having through-flow openings, part of said strip being secured to said housing, a winding roll for rolling and unrolling said strip, said roll being connected to said strip, and means for reciprocating said winding roll across said openings, the improvement comp rising means in addition to said reciprocating means for applying a rotational torque to said winding roll so as to cause said strip to be wound upon said roll as said roll is reciprocated across said parts, and characterized in that an annular part of the housing is provided over the valve seat wall, which annular part has fastening means for the closure strip and guide strips are provided which roll on and off the roll in opposition to the closure strip and in that a gasket is seated in a recess of the valve seat wall.