Abstract: A non-return device for welding installations, of the kind comprising a movable valve arranged so as to free the passage of gas for the normal supply of the torch from a welding gas generator and, by contrast, to block said passage in the case of a back-pressure resulting from an explosion in the region of the torch burner, the said valve including for this purpose closure means co-operating with a seat under the effect of resilient return means, the valve including second closure means operating inversely to the first in such a manner that the displacement of said valve, under the effect of a sudden fall in pressure downstream of the device and against return means conveniently calibrated to this effect, ensures the automatic cut-off of the flow of gas through the assembly.

Abstract: A heddle frame arrangement for a weaving machine having freely suspended heddles for a fast-running weaving machine.The upper bar and the lower bar of the frame are movable parallel to one another, so that not the entire frame must participate in the up and down movement. The heddles which are suspended on the movable bar each have, for balancing the movement, an elastic part.