The TTV Stainless Steel Actuated PTFE Butterfly Valves provide a very similar corrosion resistance to that of the standard valve, while also providing external protection where chemicals may be present or there's potential for them in your wash down requirements. The EL-O-Matic F Series are available with a SIL 3 rating approval from TÜV, which means that this actuator can be used in safety critical systems without having to consider the consequences if it fails. The “Dry Shaft” feature ensures fluid is again isolated from both the shaft and the body of the butterfly valve.