Purposes Screw gate valve is a main control equipment on flow or feed amount of powder materials,crystal grain materials,particle materials and tiny mass materials,and it is widely used in controlling flow amount variation or quick cut-off in metallurgy. Mining, constructional materials, foodstuff, chemical industry and so on. Features Simple structure, flexible in operation, little weight,no locking,specially suitable for feeding and flowing amount regulation of various solid materials and mass, conglomerated materials with diameters around 50mm, installation is not restricted by angles, easy to operate, and sizes are adjustable at any time.