A bleed valve (30) for a gas turbine engine (10), the valve (30) comprises a diffuser (50) having a plurality of holes (40) through which a bleed fluid flows (54) and into a fluid stream (B). The diffuser (50) is characterised in that at least some of the holes (40) are at least partially tangentially angled so that the bleed air forms a vortex (55) and enhances mixing with the fluid stream (B).
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