Type GS (or GSH) gravel pumps are designed for continuously handling the most difficult higher abrasive slurries which contain too big solds to be pumped by a common pump. They are suitable for delivering slurries. In mining, Explosive-sludge in metal melting, Dredging in dredger and coruse of rivers, and other fields. Type GSH 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 direction 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.

1.Parking gland: For the suction or gravity condition. The pressure of sealing liquid should be 35Kpa higher than the discharge pressure of the pump. The quantity of sealing liquid can be seen in following table:
2.Expeller seal: In general for gravity condition the gravity head should not be exceeded to 10% of the total head of the pump and the shaft power will increase by 5% about.