Dust collector air inlet control system

A dust collector comprising a pneumatic duct chamber, a valve assembly, a bag house, said duct chamber having at least one portal of a predetermined size, shape, and location, said valve assembly configured to intermittently control the flow of air into said bag house, said valve assembly comprising an elongated plunger, an open portal, a planar valve disc covering said portal and disposed perpendicular to the axis of said plunger, at least one aperture formed in said valve disc, a lower lift plate disposed below said valve disc, a flange disposed above said valve disc, a sleeve concentric with said plunger and attached to said plunger and secured to said flange, an upper plate disposed between said flange and said valve disc and having a lower surface, said flange and said upper plate being interconnected, at least one spacer separating said lower lift plate and said upper plate and having upper and lower ends, said spacer extending through said aperture formed in said valve disc and being smaller than the diameter of said aperture, said upper end in contact with said lower surface, said lower end in contact with said lower lift plate, said spacer slidable through said aperture, a hole formed in said valve disc, and said hole spaced from said aperture and smaller than the opening of said portal.