APERFEICOAMENTO EM DISPOSITIVO DE CONTROLE DE REGISTRO DE TIRAGEM

摘要

A damper control arrangement wherein a damper blade opens and closes a flow through orifice in response to selective moving means adapted to move the damper blade is preselected distance from the orifice opening varying the opening of the orifice for a predetermined period of time prior to moving the damper blade to a fully open position resulting in the orifice obtaining its maximum opening area.