A discharge valve assembly for use in dust collection systems is disclosed. The valve assembly includes a conduit (160) and a rotatable valve member (162). A rod (192) is connected to the valve member (162). The conduit (160) is formed of an elastic material and has a generally circular cross section....http://www.google.es/patents/US4204849?utm_source=gb-gplus-sharePatente US4204849 - Discharge valve assembly for multiple-stage dust collector
Discharge valve assembly for multiple-stage dust collector
