| 主权项 |
1. A vortex fluid flow device comprising a vortex chamber, multiple forward flow inlets to the chamber and a reverse flow inlet to the chamber, the vortex fluid flow device being arranged such that in use there is a greater pressure drop across the device when there is reverse fluid flow, in the direction from the reverse flow inlet to the forward flow inlets, than when there is forward fluid flow, in the direction from the forward flow inlets to the reverse flow inlet. |
