This is a dilemma raised many times in industry with the development of new compatible face-to-face designs (series 15). Both valve types serve the same purpose – line shut-off – but triple eccentric butterfly valves offer some additional advantages: they are 100% tight bidirectionally with metal-to-metal seating for high temperatures. So when are they more suitable? The closing movement is different, linear versus rotary, and less costly in the case of ZETRIX valves thanks to their gearbox operation in every case. In any event, we would always recommend using them without hesitation in sizes DN 200 and above, which means savings in cost and operation thanks to their lighter weight and lower maintenance. Where actuators are used the decision is even safer, because of the lower torque ZETRIX^® requires.

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