Well, maybe not technically ALL of them but dozens and even more than in this photo.
We narrowed down by specs that would work for us first. Between 30 and 60 second travel time, 90 deg rotation, at least 1.5nM torque, lower than 3.5VA power consumption, 24Vac operation, clutch free movement, minimum open/close, range of 3/8" to 1/2" shaft and more. Once we narrowed down to here we still had about 6 or 8 motors and we tested the top 5 for full 10 year accelerated life and field testing. Some we even used in production for a while. We are now confident when we proclaim that the Belimo motor that is made for ecojay and we sell with SmartZone wins in all categories... reliability, noise & installation/setup.