Jet pipe for conducting hot gases

Claim 1

A jet pipe for the supply of hot gases formed with a double wall for the passage of cooling means, the jet pipe having a longitudinal axis, comprising: a throttle valve rotatable about an axis transverse to the jet pipe longitudinal axis, said jet pipe being partitionable along a plane including said axis transverse to the longitudinal axis, the jet pipe including a first segment disposed ahead of the partition plane, a second segment disposed behind the partition plane, said first and second segments serving for circulation of the cooling means, said segments being separated from one another, said throttle valve comprising a core, an outer shell uniformly surrounding said core, a gap being formed between said outer shell and said core for receiving the cooling means, and first and second hollow trunnions attached to said core, said hollow trunnions communicating with said gap for the cooling means, said core of said throttle valve having a plurality of guidance ribs extending substantially over the whole surface of said core, said guidance ribs subdividing said core into a plurality of substantially longitudinal cooling means sectors, said first and second segments being formed with longitudinal ducts, respectively, a gas stream being passable through said ducts in a predetermined direction, the longitudinal direction of said sectors being substantially transverse to the gas stream direction, said outer shell of said throttle valve being disposed loosely on said trunnions, said trunnions being attached to said core in a rotation-secure manner.