Return Flow Impedors

Our RFI (Return Flow Impedors) are used for applications where the inside of the tube must be kept as dry as possible. Examples of this are galvanized tubes (to prevent ‘white rust’ formation) and also stainless steel tubes (to avoid coolant in the welding zone).

STE RFI impedors are fully repairable by simple loosening of 2 x set screws enabling replacement of casing and/or ferrite core. Replacement cut to length casings and ferrite cores are available from stock.

RFI impedors have significant advantages over other return flow designs such as:

• Rugged CNC machined brass internal assemblies
• Centre tube pinned to end plug avoiding any possible detachment during production
• High temperature Silicone glass casing (fully pressure tested)
• Both ends sealed with high specification Viton O rings
• NPT tapered thread connections to ensure full leak proof connection
• No drilled holes or fasteners in casing body

We also offer simple couplings for our RFI impedors which can be supplied with or without ‘hanger blades’ for fixing in place.

In the third quarter of 2011 we will be offering our new WELD-GUARD return flow impedors which have PTFE coated Silicone glass casings, this coating reduces ‘sticking’ of molten material to the impedor resulting in reduced production stops and increased uptime.