Patent ID: 8283594

Claim:
A system for supplying fluids to a plasma arc torch, comprising: a single-gas power supply operable for regulating supply of electrical power to the plasma arc torch and for regulating supply of a first fluid to the plasma arc torch; a flow regulator separate from the single-gas power supply and operable for regulating supply of a second fluid to the plasma arc torch; and a valve assembly comprising: a first pressure-actuated valve disposed between the flow regulator and the plasma arc torch, the pressure-actuated valve shutting off supply of the second fluid to the torch when the first pressure-actuated valve is closed and allowing the second fluid to be supplied to the torch when the first pressure-actuated valve is open, wherein the first pressure-actuated valve is structured and arranged to be opened by pressure of the first fluid being supplied to the torch and to be closed when the first fluid is not being supplied to the torch.