Wendestangen

The invention relates to an angle bar comprising an interior space impinged upon by pressurized air from which the pressurized air may escape via a plurality of openings (02) in the jacket (01) of the angle bar. At least one of the openings is provided with a valve (03). Said valve comprises a housing (04) with a main fluid inlet (6), a control fluid inlet (18) and a fluid outlet, and a valve body that can be displaced in the housing between a first position in which it at least substantially blocks the main fluid inlet. and a second position. In the second position, the valve body (09) allows a strong fluid flow from the main fluid inlet (06) to the fluid outlet (07) compared to the first position. The control fluid inlet (18) communicates with the fluid outlet (07) and the valve body (09) is forced into the second position by a pressure force that acts on a surface of the valve body (09) subjected to the pressure at the fluid outlet (07) when the pressure at the fluid outlet (07) exceeds a threshold value.