Wey‘s Knife Gate Valve design makes it a desired valve for the manufacturing of cement. Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. Common materials used to manufacture cement include limestone, shells and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand and iron ore. Conventional knife gate valves are usually not suitable for cement mixing. Leakage is very objectionable. Bi-directional bubble tight shut off is a requirement. Wey’s unique transverse seal with scraper blade design eliminates leakage to atmosphere and can be repacked in service and under full rated pressure without down time or rebuild.