<http://schema.org/description>
"Aerodyne's StopTight manual and pneumatic knife gate valve is suited for discharging dry, free-flowing materials\u2014especially powder\u2014from gravity-fed hoppers, silos, mixers, screw conveyors and chutes."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pfonline.com/products/knife-gate-valve-for-dry-material-handling>