Screw Pump Classification
Screw pump can be divided into single screw pump, twin screw pump, three screw pump, etc.

I:Single screw pump
Features:
1, may transport the liquid containing solid particles,
2, can be used for almost any viscosity fluid, especially suitable for high viscosity liquid.
3, working temperature is conditioned by the stator material.
The performance parameters:
Flow rate of 150 m3/h, the pressure is less than 20 mpa.
Application:
For molasses, pulp, starch paste, chocolate syrup, paint, asphalt, grease, paraffin, mud, clay, clay, etc.

II:Twin screw pump
Structure: there are two elements of the same size of the screw shaft, a root as the drive shaft, a driven shaft, achieve synchronous rotation through gear transmission.
Features:
1, the screw rod and pump body, and keep the 0.05 ~ 0.15 mm gap between the screw, wear small, long service life
2, packing box only by suction pressure leakage.
3, compared with the three screw pump, is not sensitive to impurities.
Performance parameters: pressure is generally about 1.4 MPa, for maximum 7 MPa viscous fluid, the viscosity of the liquid can reach 3 MPa, flow generally for 6 ~ 600 m3 / h, maximum 1600 m3 / h;Liquid viscosity shall not be greater than 1500 was/s.
Application:
Used for lubricating oil, grease, oil, tar, fuel oil and other high viscosity oil.

III:Three screw pump
Features: 
1, the driving screw driven directly driven screw, without gear transmission, structure is simple;
2, the pump body itself as a screw bearing, no need to install radial bearing;
3, the screw is not under bending load, can be very long, so can obtain high pressure;
4, unfavorable conveying liquid containing more than 600 microns solid impurities;
5, can be high speed, big flow pump is a kind of small, high volumetric efficiency;
6, packing box and suction pressure are interlinked, only less leakage.
The performance parameters:
Pressure is less than 70 mpa, the flow rate of 2000 m3 / h.Suitable viscosity was 5 ~ 250 / s.
Application:
Suitable for conveying lubricating oil, heavy oil, light oil and crude oil, etc.Also can be used in the glycerol and viscose transfer of high viscosity liquids.
Above is the single screw pump, twin screw pump, three screw pump structure characteristics, performance parameters and applications between the difference between, the user can according to the request of medium characteristics, parameters and actual situation to choose the right screw pump.