Screw Pump: The screw pump in the oil - gas multiphase pump can be used to transport crude oil containing gas, water, sand, etc. The single - screw pump can transport liquids with solid particles. When the twin - screw oil - gas multiphase pump is working, the liquid is sucked into the enclosed space surrounded by the threads and the pump casing. As the screw rotates, the sealed volume is pressurized by the extrusion of the screw teeth and moves axially, with a uniform flow rate.
Submerged Oil - sludge Pump: It belongs to the type of pump that can handle media containing sediment particles. It works submerged in the liquid. The pump body and impeller are cast from wear - resistant alloy materials. It adopts a vertical cantilever structure with a single - pump - casing design and a semi - open impeller. The gap between the impeller and the guard plate can be adjusted. It is suitable for transporting sludges containing sand or solid particles.
Self - priming Centrifugal Pump: For example, the CYZ - A type explosion - proof self - priming centrifugal pump is suitable for the petroleum industry. It can transport petroleum products such as gasoline, kerosene, and diesel. It uses a cemented carbide mechanical seal and has the advantages of strong self - priming ability, simple structure, and stable operation.