Products: Reducers / Model: RS Line The crown/worm type reducers of the “RS” line are ¼ turn devices, applied to the actuation of valves with a ¼ turn movement. / Model: RM Line The crown/worm type reducers of the “RM” line are multi-turn devices, applied to the actuation of valves with a movement greater than ¼ turn, which may be greater than one turn, but without a rising stem.