Pinch valve is a full bore or fully ported type of control valve which presents no obstruction to flow passage. There are a few types of pinch valves based upon application.pinch valve is the most practical solution for all kinds of flow control applications including abrasive, corrosive and fibrous products, granules, powders and slurries. Pinch valves
http://www.corrosion-resistant-valve...nch-valve.html are made up of only a few parts, with the flexible sleeve being the most important item.