Vertical centrifugal pumps are also referred to as cantilever pumps. They utilize a unique shaft and bearing support configuration that allows the volute to hang in the sump while the bearings are outside the sump. This style of pump uses no stuffing box to seal the shaft but instead utilizes a "throttle bushing". Vertical multistage centrifugal pump also have a widely application, including agriculture, water and wastewater plants, industrial, power generation plants, petroleum, mining, chemical, pharmaceutical, and many others. Please feel free to contact me to get a free quote now. China Vertical Centrifugal Pump Manufacturer, Hoffwell Pump is your best Choice!