DHP 2.7 Axial Piston Pump (High Pressure Pump For Industrial Reverse Osmosis)
DHP 2.7 is part of the DHP series of Axial Piston Pumps, specifically designed for the transportation of high-pressure, low-viscosity corrosive fluids. It is widely used in industrial reverse osmosis scenarios such as seawater desalination and industrial desalination, and can efficiently convey media like seawater and industrial saline wastewater.
This pump operates based on the principle of axial piston pumps. It realizes fluid transportation by the reciprocating movement of plungers parallel to the drive shaft in the plunger bores, which changes the volume of the pump cavity. Compared with traditional piston pumps, it does not require a lubricating oil tank and directly uses the conveyed fluid as the lubricating medium, fundamentally avoiding the problem of lubricating oil leakage and pollution. It is particularly suitable for transportation scenarios with high cleanliness requirements, such as seawater and industrial wastewater. Meanwhile, it has a compact structure — compared with other pump types with the same flow rate and pressure, it is smaller in size and lighter in weight. Additionally, it features high operating efficiency and low energy consumption, which can effectively reduce the long-term operating costs of seawater desalination and industrial desalination systems.
| Parameter Category | Specific Value |
|---|
| Product Model | DHP 2.7 |
| Geometric Displacement | 15 cm³/rev |
| Rated Flow at Rated Speed (3000 rpm) | 2.7 m³/h (converted to 45 L/min in minute flow rate) |
| Minimum Outlet Pressure | 20 Bar |
| Maximum Continuous Outlet Pressure | 80 Bar |
| Minimum Inlet Pressure | 1 Bar |
| Maximum Continuous Inlet Pressure | 5 Bar |
| Continuous Speed Range | 700～3450 rpm |
| Operating Noise (in accordance with EN ISO 3744-2010 Standard) | ≤77 dB(A) |
| Power at 3000 rpm and 80 Bar | 11 kW |
| Medium Temperature (depending on NaCl Concentration) | 2～50 ℃ |
| Ambient Temperature | 0～50 ℃ |
| Overall Weight | 7.8 kg |
| Integrated Component | Flushing Check Valve |
| Core Application | Seawater desalination, industrial wastewater desalination and resource recovery |
DHP 2.7 belongs to the same series as DHP1.7, 2.1, and 3.0. Under a working pressure of 80 Bar, the flow rate has a strictly proportional relationship with the rotational speed (a characteristic of fixed-displacement pumps).
The flow rate curve provides a visual indicator of the flow rate at different speeds: the horizontal axis represents speed (700-3450 rpm), and the vertical axis represents flow rate (0-3.5 m³/h). For example, at 1000 rpm, the flow rate of a DHP 2.7 is approximately 0.9 m³/h; at 3000 rpm, the flow rate reaches the rated 2.7 m³/h.
To calculate the target speed based on actual requirements, use the following formula: Selected motor speed (r/min) = (Required flow rate (m³/h) × Rated speed 3000 (r/min)) / Rated flow rate 2.7 (m³/h). Taking a required flow rate of 2.0 m³/h as an example, the calculated required motor speed is approximately 2222 rpm, making the operation convenient.
Interface Identification: The port marked "I" on the pump body is the inlet, and the one marked "O" is the outlet. Strict distinction must be made during installation to avoid reverse connection, which may cause equipment failure;
Motor Connection: A 3～5 mm gap must be reserved between the coupling of the pump and the motor, and the pump shaft must not bear axial or radial loads. Page 20 of the manual provides a standard connection diagram for the motor and the high-pressure pump, which can be referred to ensure installation accuracy;
Filtration Configuration: Impurity particles contained in seawater and industrial wastewater can wear down the precision components inside the pump. A filter with an absolute accuracy of 10 μm (filtration efficiency ≥99.98%, β10>5000) must be installed before the pump inlet. It is recommended to use a precision depth filter element and avoid using bag filters or spiral wound filter elements with only 90% filtration efficiency;
Pressure Protection: A low-pressure control switch should be installed at the inlet end, with the trigger pressure set to 1 Bar. It will automatically shut down the pump when the inlet pressure is lower than this value to prevent the pump from idling. A high-pressure control switch (set pressure 70 Bar) and a safety valve must be installed between the outlet and the reverse osmosis membrane to prevent damage to pipelines or membrane modules due to system overpressure;
Shutdown Flushing: In high-salinity environments (such as seawater desalination), the pump cavity must be flushed with fresh water after each shutdown to discharge residual concentrated brine and prevent salt crystallization from clogging or corroding components. If the shutdown lasts more than 3 days, flushing with fresh water is required; if it lasts more than 15 days, flushing with fresh water containing a bactericide is necessary. Starting the pump with the rear valve closed is strictly prohibited to avoid safety accidents.
The power of the DHP 2.7 varies with the operating pressure. The following table lists its power requirements at different typical pressures (rated speed 3000 rpm):
| Pump Model | Rated Flow (m³/h) | Power at 60 Bar | Power at 70 Bar | Power at 80 Bar |
|---|
| DHP 2.7 | 2.7 | 7.5 kW | 7.5 kW | 11 kW |
When selecting a motor, it is necessary to consider the actual working pressure. For example, the working pressure of a seawater desalination system is usually 70～80 Bar, so an 11 kW motor is recommended to ensure power matching and avoid energy waste.
DHP 2.7 has the same dimensions as the DHP1.7～3.0 series in the same product line, with specific specifications as follows:
| Pump Model | Inlet Size | Outlet Size |
|---|
| DHP 2.7 | G3/4〞, Depth 18 mm | G3/4〞, Depth 18 mm |
The following are examples of dimensions that match commonly used motors and can be used for installation space planning:
| Pump Model | A | B | H | K | P | AD | HD | Matching IEC Motor |
|---|
| DHP 2.7 | 216 | 140 | 132 | 12 | 300 | 220 | 350 | 7.5 kW - 2P |
| DHP 2.7 | 254 | 210 | 160 | 12 | 350 | 260 | 420 | 11 kW - 2P |
Lubrication Characteristics: This pump uses the conveyed fluid as the lubricating medium, so no additional lubricating oil is required, and daily maintenance related to lubrication is unnecessary;
Regular inspection: Under the required operating conditions (10 μm filtration accuracy, normal pressure/speed), it is recommended to conduct a comprehensive inspection every 8,000 hours and replace worn parts (such as seals, plunger sleeves, etc.) to prevent the expansion of faults;
Corrosion Protection: Although the pump body is made of 2205 duplex stainless steel with excellent corrosion resistance, it still needs to be thoroughly flushed before long-term shutdown in a high-salinity environment to prevent local corrosion caused by residual salt.
Basic Warranty: A 1-year free maintenance service is provided from the date of delivery (excluding faults caused by man-made damage or non-compliant operation);
Extended Protection: If the equipment operates under specified conditions at all times, it can enjoy an 8000-hour maintenance-free warranty, with a maximum period not exceeding 18 months from the date of delivery;
After-Sales Support: The manufacturer provides fault detection, on-site maintenance, factory overhaul, and spare parts supply services. Support can be obtained through the contact information below.
Company: WUXI FENIGAL SCIENCE AND TECHNOLOGY CO., LTD. (FG Water Technologies)
Address: Chuangyi Industrial Park, No. 100 Dicui Road, Binhu District, Wuxi City, Jiangsu Province, P. R. China
Tel: +86-510-85163211
Mobile: +86-13646187144
Email: [email protected]
Official Website: https://www.fgwater.com
FENIGAL, the manufacturer of DHP 2.7, has focused on the research and development of high-pressure piston pumps since 1990 and is the first enterprise in China to produce axial high-pressure piston pumps. After nearly 15 years of in-depth cultivation and innovation, the enterprise has realized the localization of axial high-pressure piston pumps. Its technical level and product quality have reached world advanced standards, and its production scale ranks among the top in the domestic industry, successfully breaking through the product bottleneck problems in related fields.
Adhering to the tenet of "quality first, integrity-based, customer satisfaction", FENIGAL collaborates with its OEM partner Shenzhen CW Environment Technology to provide efficient core fluid equipment and technical solutions for fields such as seawater desalination and industrial desalination. At the same time, it continuously improves its supply chain and sales service system to contribute to the implementation of "Made in China 2025" and the industrial foundation strengthening strategy.
PDF manual download address:DHP type plunger pump selection manual