China Heavy Oil Bitumen Pump (rd-3g) - China screw pump ...- 3G horizontal three screw pump sealed by mechanical seal ,China Heavy Oil Bitumen Pump (rd-3g), Find details about China screw pump, bitumen pump from Heavy Oil Bitumen Pump (rd-3g) - Yongjiang Ronda Pump Valve Co., Ltd.Products - DVSpecialised mechanical seal arrangement allows the pump to handle liquids with solids in suspension and they can also run dry for short periods. ... The pump column is sealed by means of a double mechanical seal arrangement in an oil chamber. ... THREE SCREW PUMPS;