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The DHP16, DHP17, DHP19, DHP22 series high-pressure pumps are designed to transport high-pressure, low-viscosity corrosive fluids, such as high-pressure brine (seawater) in seawater reverse osmosis.
Based on the principle of axial piston pumps, the DHP16, DHP17, DHP19, DHP22 series pumps work by using the volume change produced by the reciprocating movement of the piston parallel to the drive shaft in the piston hole, and use the fluid itself to lubricate the moving parts of the pump. This series of pumps is integrated with a check valve, which allows fluid to flow from the inlet to the outlet via the check valve when the pump stops.
The DHP16, DHP17, DHP19, DHP22 series pumps are fixed displacement pumps, and the flow rate is proportional to the speed of the input shaft and the displacement of the pump.
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The DHP16, DHP17, DHP19, DHP22 series high-pressure pumps are positive displacement pumps with nine axial pistons that move a fixed amount of water in each cycle. The pumps are based on the axial piston principle enabling a very light and compact design. Flow is proportional to the number of input shaft revolutions(rpm). Unlike centrifugal pumps, they produce the same flow at a given speed no matter what the discharge pressure.
The DHP16, DHP17, DHP19, DHP22 range of high-pressure pumps is designed for use in RO applications with low viscosity and corrosive fluids such as: Sea water (in seawater reverse osmosis filtration applications), Brackish water (high-pressure saltwater pumping), Waste water.
The DHP16, DHP17, DHP19, DHP22 series high-pressure pumps are supplied with an integrated flushing valve that allows the salt water to flow from inlet to the outlet, when the pump is not running.
√ Simple structure, small size, light weight, one of the smallest and lightest pumps on the market
√ Low pressure fluctuation, high working pressure
√ If a special coupling is used, it can be driven by an internal combustion engine
√ No need for lubricating oil, long maintenance period, no preventive maintenance during the warranty period
√ The pressure pulse generated in the pressure pipe is extremely small
√ Integrated flushing check valve, no need for additional installation
√ All parts of the pump are made of corrosion-resistant materials such as duplex (SAF 2205 / EN 1.4462 / UNS 31803) and super duplex (SAF 2507 / EN 1.4410 / UNS 32507) stainless steel, and carbon fiber reinforced polyether ether ketone (PEEK)) production
√ Efficient
| Specification | DHP16 | DHP17 | DHP19 | DHP22 |
| Geometric displacement cm3/rpm | 188 | 197 | 219 | 253 |
| Rated flow at 1500rpm, m3/h | 15.8 | 16.9 | 18.8 | 21.8 |
| Minimum outlet pressure, Bar | 20 | 20 | 20 | 20 |
| Maximum continuous outlet pressure, Bar | 80 | 80 | 80 | 80 |
| Maximum gap outlet pressure, Bar | 100 | 100 | 100 | 100 |
| Minimum inlet pressure, Bar | 2 | 2 | 2 | 2 |
| Maximum continuous inlet pressure, Bar | 5 | 5 | 5 | 5 |
| Maximum continuous speed, rpm | 1500 | 1500 | 1500 | 1500 |
| Minimum continuous speed, rpm | 700 | 700 | 700 | 700 |
| Noise dB(A) | ≤85 | ≤85 | ≤85 | ≤85 |
| Power when rated speed 1500rpm and outlet pressure 80Bar, kW | 45 | 55 | 55 | 75 |
| Weight, kg | 78 | 78 | 78 | 78 |
| Integrated flushing check valve | YES | YES | YES | YES |
If the required flow rate and speed (rpm) are known, it will be easy to select the most suitable pump by using the diagram below:
Not only that, the graph also shows that the flow rate can vary with the speed of the pump. The flow/speed ratio is fixed, and the required flow can be obtained by changing the speed to the corresponding value.
| MODEL | FLOW | PRESSURE | SPEED | |||
| L/min | m³/h | 60Bar | 70Bar | 80Bar | rpm | |
| DHP16 | 263 | 15.8 | 37kW | 45kW | 45kW | 1500 |
| DHP17 | 281 | 16.9 | 37kW | 45kW | 55kW | 1500 |
| DHP19 | 313 | 18.8 | 45kW | 45kW | 55kW | 1500 |
| DHP22 | 366 | 21.8 | 45kW | 55kW | 75kW | 1500 |
The DHP series high-pressure pump can directly supply water from the feed water pump, and the pressure of the water inlet of the high-pressure pump must be within the range of 2-5Bar (0.2-0.5Mpa or 29-72.5psi).
Unit conversion relationship: 1.0Mpa=10Bar, 1.0Mpa=145psi
Fluid temperature: +2°C ～ +50°C-depends on the concentration of NaCl
Ambient temperature: +2°C ～ +50°C
The following figure shows the relationship between the corrosion resistance of different types of stainless steel and the concentration of NaCl and temperature.
All key components of DHP series high pressure pumps are made of 2507.
If the high-pressure pump is running under conditions of high salt content, fresh water should be used to flush the high-pressure pump during shutdown to reduce the risk of corrosion.
Storage temperature: -40°C to +70°C (the pump has been emptied and sealed for storage).
Antifreeze is required when the temperature is lower than 2°C; It is recommended to use Dow Cal-N from DuPont Chemical Company or Chill safe Propylene Glycol from Ark man Chemical Company.
Under normal circumstances, the noise will be reduced when the speed is reduced, and vice versa. Flexible hoses can be used to minimize vibration and noise.
As the pump (group) is usually installed on a bell-shaped cover or base, the noise level can only be determined by the entire system. Therefore, the correct use of shock absorbers to install the pump set on the base is extremely important to reduce vibration and noise.
The noise level is affected by the following factors:
The speed of the pump, high speed produces more noise than low speed
The rigid installation of the pump generates more noise than the flexible installation
Compared with the connection through a hose, the direct connection of the pipe to the pump will increase the noise
Because the viscosity of water is very low, in order to control the internal leakage rate and improve the performance of the components, the gap of the DHP series high pressure pump is designed to be very small. Therefore, proper filtration of inlet water is essential to minimize pump wear.
The main filter must have a filtration efficiency of 99.98% for particles above 10 µm. It is recommended to use a precision depth filter element with a rated accuracy of 10 µm (absolute accuracy) and ß10>5000 (equivalent to a filtration efficiency of 99.98%). Filter bags and wound filter elements usually only have a filtration efficiency of 90%, which means that for every 100,000 particles that reach the filter, 10,000 pass through. Relatively speaking, only 20 pass through a filter with an efficiency of 99.98%.
| PUMP MODEL | DHP16~DHP22 |
| Flat key (mm) | 12×8×70 |
| Exhaust Plug | 8mm inner hexagon |
| Inlet Interface | M52×1.5，Depth 21mm |
| Outlet Interface | M52×1.5，Depth 21mm |
Unit: mm
| Model | A | B | C | D | E | F | G | H | I | J | K | L | IEC Motor |
| DHP16-22 | 518 | 415 | 318 | 19 | 510 | 200 | 1249 | 305 | M52 | 342 | 204 | 700 | 30KW, 4P |
| 542 | 443 | 356 | 19 | 545 | 225 | 1256 | 286 | M52 | 342 | 234 | 680 | 37KW, 4P | |
| 542 | 443 | 356 | 19 | 545 | 225 | 1311 | 311 | M52 | 342 | 234 | 735 | 45KW, 4P | |
| 603 | 485 | 406 | 24 | 610 | 250 | 1387 | 349 | M52 | 342 | 275 | 770 | 55KW, 4P | |
| 661 | 544 | 457 | 24 | 670 | 280 | 1452 | 368 | M52 | 342 | 275 | 835 | 75KW, 4P |
Unit: mm
| Model | A | B | C | D | E | F | G | H | I | J | K | L | IEC Motor |
| DHP16-22 | 518 | 415 | 318 | 19 | 510 | 200 | 1316 | 305 | M52 | 342 | 204 | 770 | 30KW, 4P |
| 542 | 443 | 356 | 19 | 545 | 225 | 1316 | 286 | M52 | 342 | 234 | 740 | 37KW, 4P | |
| 542 | 443 | 356 | 19 | 545 | 225 | 1371 | 311 | M52 | 342 | 234 | 795 | 45KW, 4P | |
| 603 | 485 | 406 | 24 | 610 | 250 | 1497 | 349 | M52 | 342 | 275 | 880 | 55KW, 4P | |
| 662 | 530 | 457 | 24 | 675 | 280 | 1567 | 368 | M52 | 342 | 275 | 950 | 75KW, 4P |
The figure below shows how the pump is connected to the motor
A: Pump spindle
B: Flexible coupling
C: Bell cover
① in order to facilitate system flushing and discharge, the high-pressure pump has integrated a bypass check valve (5) inside the pump.
② Install the inlet filter (1) before the high-pressure pump (2). Please refer to section 2.8-"Filtering" for instructions on how to select the appropriate filter. Thoroughly clean the pipeline and flush the system before starting.
③ Install a low pressure control switch (3) between the filter and the pump inlet and set 1 Bar (14.5 psi) as the control point. When the pressure is lower than 1 Bar (14.5 psi), the low-pressure switch must be able to shut down the pump.
④ Install a high pressure control switch (7) between the pump outlet and the reverse osmosis membrane inlet, and set 70 Bar (1015 psi) as the control point. When the pressure is higher than 70 Bar (1015 psi), the high-pressure switch must be able to shut down the pump.
⑤ Determine the size of the inlet pipe to minimize the pressure loss (large flow area, short pipe length, as few elbows/joints as possible, and accessories with small pressure loss).
⑥ To eliminate the risk of damage and cavitation, the inlet should always be at positive pressure: minimum 0.5 Bar (7.3psi), maximum 5 Bar (72.5 psi)
⑦ Use elastic hose (4) to minimize vibration and noise.
⑧ Install the safety valve (6) to avoid damage to the system, because the plunger pump will generate pressure and flow immediately after starting without being affected by any reverse pressure.
The meticulous design makes the DHP series high-pressure pumps have a long running time, low maintenance requirements, and reduce life cycle costs.
If the DHP series high-pressure pump runs under the specified pre-filtration, pressure and speed conditions, an 8000-hour maintenance-free warranty is provided, but the maximum period from the date of production does not exceed 18 months.
In order to prevent the pump from being completely damaged, it is recommended that you inspect the pump at most 8000 hours, at which time any worn parts must be replaced.
Although the DHP series high-pressure pumps are made of duplex/super duplex stainless steel with excellent corrosion resistance, it is always recommended to flush the pump with fresh water when the system is shut down.
DHP series high pressure pump uses water as lubricant, so there is no oil in the pump.
If the pump runs under the curve of SAF 2507 shown in section 2.6, it is not expected that parts need to be replaced during the initial 8000 hours of operation.
The DHP16, DHP17, DHP19, DHP22 series high-pressure pumps are positive displacement pumps with nine axial pistons that move a fixed amount of water in each cycle. The pumps are based on the axial piston principle enabling a very light and compact design. Flow is proportional to the number of input shaft revolutions(rpm). Unlike centrifugal pumps, they produce the same flow at a given speed no matter what the discharge pressure.
The DHP16, DHP17, DHP19, DHP22 range of high-pressure pumps is designed for use in RO applications with low viscosity and corrosive fluids such as: Sea water (in seawater reverse osmosis filtration applications), Brackish water (high-pressure saltwater pumping), Waste water.
The DHP16, DHP17, DHP19, DHP22 series high-pressure pumps are supplied with an integrated flushing valve that allows the salt water to flow from inlet to the outlet, when the pump is not running.
√ Simple structure, small size, light weight, one of the smallest and lightest pumps on the market
√ Low pressure fluctuation, high working pressure
√ If a special coupling is used, it can be driven by an internal combustion engine
√ No need for lubricating oil, long maintenance period, no preventive maintenance during the warranty period
√ The pressure pulse generated in the pressure pipe is extremely small
√ Integrated flushing check valve, no need for additional installation
√ All parts of the pump are made of corrosion-resistant materials such as duplex (SAF 2205 / EN 1.4462 / UNS 31803) and super duplex (SAF 2507 / EN 1.4410 / UNS 32507) stainless steel, and carbon fiber reinforced polyether ether ketone (PEEK)) production
√ Efficient
| Specification | DHP16 | DHP17 | DHP19 | DHP22 |
| Geometric displacement cm3/rpm | 188 | 197 | 219 | 253 |
| Rated flow at 1500rpm, m3/h | 15.8 | 16.9 | 18.8 | 21.8 |
| Minimum outlet pressure, Bar | 20 | 20 | 20 | 20 |
| Maximum continuous outlet pressure, Bar | 80 | 80 | 80 | 80 |
| Maximum gap outlet pressure, Bar | 100 | 100 | 100 | 100 |
| Minimum inlet pressure, Bar | 2 | 2 | 2 | 2 |
| Maximum continuous inlet pressure, Bar | 5 | 5 | 5 | 5 |
| Maximum continuous speed, rpm | 1500 | 1500 | 1500 | 1500 |
| Minimum continuous speed, rpm | 700 | 700 | 700 | 700 |
| Noise dB(A) | ≤85 | ≤85 | ≤85 | ≤85 |
| Power when rated speed 1500rpm and outlet pressure 80Bar, kW | 45 | 55 | 55 | 75 |
| Weight, kg | 78 | 78 | 78 | 78 |
| Integrated flushing check valve | YES | YES | YES | YES |
If the required flow rate and speed (rpm) are known, it will be easy to select the most suitable pump by using the diagram below:
Not only that, the graph also shows that the flow rate can vary with the speed of the pump. The flow/speed ratio is fixed, and the required flow can be obtained by changing the speed to the corresponding value.
| MODEL | FLOW | PRESSURE | SPEED | |||
| L/min | m³/h | 60Bar | 70Bar | 80Bar | rpm | |
| DHP16 | 263 | 15.8 | 37kW | 45kW | 45kW | 1500 |
| DHP17 | 281 | 16.9 | 37kW | 45kW | 55kW | 1500 |
| DHP19 | 313 | 18.8 | 45kW | 45kW | 55kW | 1500 |
| DHP22 | 366 | 21.8 | 45kW | 55kW | 75kW | 1500 |
The DHP series high-pressure pump can directly supply water from the feed water pump, and the pressure of the water inlet of the high-pressure pump must be within the range of 2-5Bar (0.2-0.5Mpa or 29-72.5psi).
Unit conversion relationship: 1.0Mpa=10Bar, 1.0Mpa=145psi
Fluid temperature: +2°C ～ +50°C-depends on the concentration of NaCl
Ambient temperature: +2°C ～ +50°C
The following figure shows the relationship between the corrosion resistance of different types of stainless steel and the concentration of NaCl and temperature.
All key components of DHP series high pressure pumps are made of 2507.
If the high-pressure pump is running under conditions of high salt content, fresh water should be used to flush the high-pressure pump during shutdown to reduce the risk of corrosion.
Storage temperature: -40°C to +70°C (the pump has been emptied and sealed for storage).
Antifreeze is required when the temperature is lower than 2°C; It is recommended to use Dow Cal-N from DuPont Chemical Company or Chill safe Propylene Glycol from Ark man Chemical Company.
Under normal circumstances, the noise will be reduced when the speed is reduced, and vice versa. Flexible hoses can be used to minimize vibration and noise.
As the pump (group) is usually installed on a bell-shaped cover or base, the noise level can only be determined by the entire system. Therefore, the correct use of shock absorbers to install the pump set on the base is extremely important to reduce vibration and noise.
The noise level is affected by the following factors:
The speed of the pump, high speed produces more noise than low speed
The rigid installation of the pump generates more noise than the flexible installation
Compared with the connection through a hose, the direct connection of the pipe to the pump will increase the noise
Because the viscosity of water is very low, in order to control the internal leakage rate and improve the performance of the components, the gap of the DHP series high pressure pump is designed to be very small. Therefore, proper filtration of inlet water is essential to minimize pump wear.
The main filter must have a filtration efficiency of 99.98% for particles above 10 µm. It is recommended to use a precision depth filter element with a rated accuracy of 10 µm (absolute accuracy) and ß10>5000 (equivalent to a filtration efficiency of 99.98%). Filter bags and wound filter elements usually only have a filtration efficiency of 90%, which means that for every 100,000 particles that reach the filter, 10,000 pass through. Relatively speaking, only 20 pass through a filter with an efficiency of 99.98%.
| PUMP MODEL | DHP16~DHP22 |
| Flat key (mm) | 12×8×70 |
| Exhaust Plug | 8mm inner hexagon |
| Inlet Interface | M52×1.5，Depth 21mm |
| Outlet Interface | M52×1.5，Depth 21mm |
Unit: mm
| Model | A | B | C | D | E | F | G | H | I | J | K | L | IEC Motor |
| DHP16-22 | 518 | 415 | 318 | 19 | 510 | 200 | 1249 | 305 | M52 | 342 | 204 | 700 | 30KW, 4P |
| 542 | 443 | 356 | 19 | 545 | 225 | 1256 | 286 | M52 | 342 | 234 | 680 | 37KW, 4P | |
| 542 | 443 | 356 | 19 | 545 | 225 | 1311 | 311 | M52 | 342 | 234 | 735 | 45KW, 4P | |
| 603 | 485 | 406 | 24 | 610 | 250 | 1387 | 349 | M52 | 342 | 275 | 770 | 55KW, 4P | |
| 661 | 544 | 457 | 24 | 670 | 280 | 1452 | 368 | M52 | 342 | 275 | 835 | 75KW, 4P |
Unit: mm
| Model | A | B | C | D | E | F | G | H | I | J | K | L | IEC Motor |
| DHP16-22 | 518 | 415 | 318 | 19 | 510 | 200 | 1316 | 305 | M52 | 342 | 204 | 770 | 30KW, 4P |
| 542 | 443 | 356 | 19 | 545 | 225 | 1316 | 286 | M52 | 342 | 234 | 740 | 37KW, 4P | |
| 542 | 443 | 356 | 19 | 545 | 225 | 1371 | 311 | M52 | 342 | 234 | 795 | 45KW, 4P | |
| 603 | 485 | 406 | 24 | 610 | 250 | 1497 | 349 | M52 | 342 | 275 | 880 | 55KW, 4P | |
| 662 | 530 | 457 | 24 | 675 | 280 | 1567 | 368 | M52 | 342 | 275 | 950 | 75KW, 4P |
The figure below shows how the pump is connected to the motor
A: Pump spindle
B: Flexible coupling
C: Bell cover
① in order to facilitate system flushing and discharge, the high-pressure pump has integrated a bypass check valve (5) inside the pump.
② Install the inlet filter (1) before the high-pressure pump (2). Please refer to section 2.8-"Filtering" for instructions on how to select the appropriate filter. Thoroughly clean the pipeline and flush the system before starting.
③ Install a low pressure control switch (3) between the filter and the pump inlet and set 1 Bar (14.5 psi) as the control point. When the pressure is lower than 1 Bar (14.5 psi), the low-pressure switch must be able to shut down the pump.
④ Install a high pressure control switch (7) between the pump outlet and the reverse osmosis membrane inlet, and set 70 Bar (1015 psi) as the control point. When the pressure is higher than 70 Bar (1015 psi), the high-pressure switch must be able to shut down the pump.
⑤ Determine the size of the inlet pipe to minimize the pressure loss (large flow area, short pipe length, as few elbows/joints as possible, and accessories with small pressure loss).
⑥ To eliminate the risk of damage and cavitation, the inlet should always be at positive pressure: minimum 0.5 Bar (7.3psi), maximum 5 Bar (72.5 psi)
⑦ Use elastic hose (4) to minimize vibration and noise.
⑧ Install the safety valve (6) to avoid damage to the system, because the plunger pump will generate pressure and flow immediately after starting without being affected by any reverse pressure.
The meticulous design makes the DHP series high-pressure pumps have a long running time, low maintenance requirements, and reduce life cycle costs.
If the DHP series high-pressure pump runs under the specified pre-filtration, pressure and speed conditions, an 8000-hour maintenance-free warranty is provided, but the maximum period from the date of production does not exceed 18 months.
In order to prevent the pump from being completely damaged, it is recommended that you inspect the pump at most 8000 hours, at which time any worn parts must be replaced.
Although the DHP series high-pressure pumps are made of duplex/super duplex stainless steel with excellent corrosion resistance, it is always recommended to flush the pump with fresh water when the system is shut down.
DHP series high pressure pump uses water as lubricant, so there is no oil in the pump.
If the pump runs under the curve of SAF 2507 shown in section 2.6, it is not expected that parts need to be replaced during the initial 8000 hours of operation.
