triple screw
Triple Screw Pumps
Triple Screw Pumps have three screws – a drive screw and two driven screws – meshed inside the pump casing forming transfer chambers. Turning the drive screw moves the chambers continuously in an axial thrust.
The screws are in contact with each other as well as the pump casing, so they must always be lubricated. There are five Triple Screw Pump models.
During operation, the main screw rotates to move the chambers in a continuous, axial direction. Because the volume of each chamber remains constant, the pump delivers a steady, uninterrupted flow along its entire length. The resulting axial thrust is fully counterbalanced by a compensating piston, ensuring smooth operation. The driven screws are supported by bearings located in the discharge section and are only partially balanced. The internal forces between components vary depending on the viscosity of the medium being pumped.
PDT Model
- Specially designed for vertical tank top mounting with submerged suction and discharge outside the tank.
- Option for internal or external bearings with replaceable cartridge assembly.
- Ideal for Hydro Turbine Governing Systems.
PDS Model
- A vertical pedestal-mounted pump with motor directly on casing flange.
- Lateral suction and discharge with reversible flange orientation.
- Available with heating cover/jacket for medium to high-temperature fluids.
PDH Model
- Horizontal foot-mounted design with lateral suction/discharge and reversible flange.
- Symmetrical casing allows flexible inlet/outlet orientation.
- Built-in relief valve for pressure control and re-circulation.
PDF Model
- Bell-mounted casing suitable for both horizontal and vertical installation.
- Flexible flange arrangement with 180° reversal option.
- Designed for high-temperature fluids with heating jacket support.
PDE Model
- Complete cartridge pump ready for direct installation—no external casing required.
- Special construction allows standalone operation without additional housing.
- Compact and ideal for machine or plant integration.
- Turbulence-free and no pulsation
- Triplex pumps are suitable for low NPSH
- Replaceable Cartridge Construction
- Noiseless Operation
- Low maintenance
- Wide variety of casing material, sealing, and mounting arrangements available
Triplex pumps are suitable for the following applications across industries.
- Lube oil handling
- Fuel oil handling
- Pressurizing pumps
- Centralized lubrication systems
- Boiler firing/circulation
- Seal oil supply for generators
- Coal tar transfer
- Crosshead lube-oil pump
- Vacuum residue / Bitumen / Asphalt transfer
| Model | Nozzle Size (mm) | Flow Rate (m³/h) | Pressure (bar) | |||
| Suction | Discharge | G | N | K | ||
| 25 | 25 | 25 | 2 | 10 | 15 | 60 |
| 32 | 32 | 25 | 5 | 10 | 15 | 60 |
| 38 | 65 | 50 | 10 | 10 | 15 | 60 |
| 45 | 65 | 50 | 13 | 10 | 15 | 60 |
| 52 | 80 | 65 | 20 | 10 | 15 | 60 |
| 60 | 100 | 80 | 32 | 15 | 20 | 60 |
| 70 | 125 | 100 | 66 | 15 | 20 | 60 |
| 80 | 125 | 100 | 78 | 15 | 20 | 60 |
| 90 | 150 | 125 | 109 | 15 | 20 | 60 |
| 100 | 150 | 125 | 78 | 15 | 15 | 60 |
| 110 | 200 | 150 | 102 | 15 | 30 | 40 |
Note: Screw types: G = Large Pitch, N = Normal Pitch, K = Kral Type.
low rate: Models 25-90 at 2950 RPM; Models 100 & 110 at 1450 RPM
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