Patent ID: 6830599
Filing Date: 2004-12-14
Classification: B01D,F16K,Y10S

Abstract:
A valve for cyclically connecting a vacuum and a blower to a filter comprising a box having three openings therein, a first of said openings being connectable to the vacuum, a second of said openings being connectable to the blower and a third of said openings being connectable to the filter, a flapper hinged for angular motion within said box and adapted to be biased by the blower and the vacuum toward a first position in which said flapper closes said first opening and a rotating cam and a follower fixed to said flapper outside said box for holding said flapper against said bias in a second position in which said flapper closes said second opening, said cam and said follower being adapted to intervally release said flapper to said bias to close said first opening.