Profile: Wm. W. Meyer & Sons, Inc. specializes in the manufacture of dry bulk material processing equipment, dust collectors, rotary airlock feeders, insulation blowing machines and vacuum collection systems. Our series 600 blowing machine is specifically designed for the mid-sized contractor. These are capable of blowing all types of loose fill materials such as cellulose, fiberglass and rockwool. Our series 100 and series 300 insulation blowing machines provide versatile & portable alternatives for the small professional contractor, equipment rental outlet or do-it-yourselfer. Capable of all-fiber installation of loose fill or spray materials, the series 100 features welded steel construction, heavy-duty rotary air lock, powder coated finish, and 8 cu. ft. hopper capacity. Designed for versatility, the electric portable series 100 provides exceptional production & coverage. The SD standard-duty drop-thru rotary airlock valves are designed for reliable material metering & airlock service. Ideal for pollution control applications in wood, grain, food, textile, paper, tobacco, rubber, and paint industries, the SD valve works beneath dust collectors & cyclone separators where temperatures do not exceed 250°F & pressure differentials are less than 6 PSI. The SD valves are available with square or round flanges. They feature rugged castings and larger shaft diameters.