Abstract text

A novel enhanced stopcock is disclosed, as well as related methods, that safely controls flow of flow materials from a pump. Pump fills a first chamber, from which a second chamber is filled. Flow material is dispensed from the second chamber when the stop cock is moved to a different position wherein it is no longer in fluid communication with the first chamber. Pressure sensors disposed in fluid communication with first and second chambers are used to determine the volume of flow material dispensed.