Patent ID: 8853589

Claim:
A nozzle for a liquid-cooled plasma torch comprising: at least two liquid supply grooves and at least two liquid return grooves; a nozzle tip and a nozzle bore for the exit of a plasma gas jet at said nozzle tip, said nozzle tip having an outer surface; a first portion of said nozzle, said first portion having an outer surface that is substantially cylindrical, and a second portion of said nozzle, said second portion being adjacent said first portion and positioned towards said nozzle tip the outer surface of said second portion tapering substantially conically toward said nozzle tip; at least one of a liquid supply groove and a liquid return groove extending over said second portion in said outer surface of said nozzle towards said nozzle tip; said at least one of a liquid supply groove and a liquid return groove also extends over part of said first portion; and said first portion having at least one first portion groove, said first portion groove being positioned to communicate with at least one liquid supply groove or liquid return groove.