Type 4D-FG gravel pumps are designed for continously handling the most difficult higher abrasive slurries which contain too big soids to be pumped by a common pump．They are suitable for delivering slurries in Mining，Explosive-sludge in metal melting，Dredging in dredger and course of rivers，and other fields．

Type FG pumps are of high-head ones．Construction of this pump is of single casing connected by means of clamp bands and wide wet-passage．The wet-parts are made of Ni-hard and high chromium abrasion resistance alloys．The discharge dffection of pump can be oriented in any direction of 360 ° This type of pump possesses the advantages of easy installation and operation，good performance of NPSH and abrasion-resistance．