Triple Screw Pumps are positive displacement pumps of very simple design. They consist of three rotating parts only “the rotors” which turn in their precisely machined housing bores. The rotors are of double start screws, continuously meshing to form delivery Chambers, which move constantly from the suction to the pressure / discharge side. Constant volume of the chambers and the uniformity of the movement allow an even flow. The pumps remain therefore near silent in operation and almost free of pulsation, even at high speed. The Principle of screw pump and its accurate profiles warrant high suction power. Axial loads on the rotor are compensates by adequate design of the bearing part. All the radial loads are self-compensated.



Triple Screw Pumps, type TH are used for the transfer of fluids with lubricating properties, as well as for generating pressure in hydraulic units or overcoming pressure in the hydraulic circuits. Main Industrial uses are in :


Power Hydraulics


Oil & Gas


Power Generation

Machine Tools

Compressor Lubrication






Bunker Oil, Engine Oil, Furnace Oil, Heating Oil, Hydraulic Oils, High Viscosity Lubrication Oil, Mineral Oil, Synthetic Oil, Oil Water Emulsions and Fuel Oils



Pump Housing : Carbon Steel, Cast Iron, Aluminum Alloy & Stainless Steel


Main Screw : Alloy Steel, Hardened Steel and Surface Treated Steel

Idler Screw : Steel, Hardened Steel, Surface Treated Steel and Cast Iron

Shaft Sealing : Mechanical Seal / Lip Seal with Elastomers in Viton, EPDM & Nitrile

Mounting Frames : Fabricated Steel

Relief Valve Parts : In Steel & Cast Iron


The High Oil Yield of Triple Screw Pump

After we understand the three-screw pump and its working principle in the field of oil extraction, we need to solve a key problem: how to achieve the high yield of the three-screw pump. The following are three important factors to improve the pumping efficiency of the three-screw pump


The indicator dynamometer measures the percentage of the pump full factor, and the integrated data acquisition system can simultaneously obtain motor power and indicator data. One of the main purposes of the indicator diagram is to diagnose how the pump is operating and analyze downhole problems. Using the production level measurement combined with the dynamometer can understand whether the well is producing at maximum production, whether the height of the liquid column is higher than the depth of the pump suction, whether the pump is not filled, and whether the free gas moves upward along the casing annulus.



Downhole gas separation. Ineffective pump operation is often caused by gas interference, which can be diagnosed by acoustic wave level measurement and indicator diagram. It is best to place the pump suction port below the fluid inlet section, and if it is placed above, a gas separator should be used. If the valve seat pup is arranged at least 10ft below the bottom of the fluid inlet interval, effective gas separation can occur in the annulus, and the casing will function as the outer cylinder of the separator. However, the conditions of the well often do not allow the pump to be placed below the fluid inlet layer, so consider using a downhole gas separator. A conventional gas separator is composed of a fluid inlet port (such as a perforation nipple), an outer cylinder (such as a section of tubing with a plug at the bottom), and a liquid-sealing tube at the bottom of the pump.



Diagnose inefficient wells. The method of diagnosis is to determine the total efficiency of the pumping system and to determine the total efficiency only needs to measure the input power of the prime mover, determine the bottom hole production pressure, and accurate production test data. Generally, the total efficiency of the beam pumping system should be about 50%, if it is lower than this, its performance should be improved. Techniques to improve overall efficiency include maintaining high volumetric efficiency (matching pump specifications with wellbore injection volume, eliminating gas interference, pumping with a pump-down controller or timer), and replacing an oversized motor.


After fully considering all factors, you can easily configure a screw pump that meets your application requirements. In addition to these considerations, it is also important to purchase pumps from reliable suppliers (such as CQ Mingzhu). The company provides various types of PC pumps, such as the three-screw pump, the twin-screw pump, and the single-PC pump.