DHP 0.6 Axial Piston Pump (High Pressure Pump For Industrial Reverse Osmosis)

Basic Background

DHP 0.6 is a member of the DHP series of Axial Piston Pumps. It is a high-pressure fluid transfer device specifically designed for industrial reverse osmosis scenarios such as seawater desalination and industrial desalination, capable of efficiently transferring low-viscosity corrosive media like seawater and industrial saline wastewater.

This pump operates based on the principle of axial piston pumps: it realizes fluid transfer by the reciprocating movement of plungers parallel to the drive shaft within plunger bores, which changes the volume of the pump cavity. Its core advantage lies in using the transferred fluid itself as the lubricating medium, eliminating the need for a traditional lubricating oil tank and fundamentally avoiding oil leakage pollution. This makes it perfectly suitable for scenarios with high cleanliness requirements, such as seawater and industrial wastewater treatment. Additionally, it features a compact structure (weighing only 3.7 kg), high operating efficiency, and an integrated flushing check valve, which simplifies the design of reverse osmosis membrane systems, reduces installation space and costs, and is particularly suitable for small and medium-sized seawater desalination or industrial desalination equipment.

Core Technical Parameters of DHP 0.6

Pump Flow Curve

DHP 0.6 is a fixed-displacement pump. Under a working pressure of 80 Bar, the flow rate has a strictly proportional relationship with the rotational speed. The flow curve on Page 14 of the manual allows for intuitive query of the flow rate corresponding to different rotational speeds: the horizontal axis represents rotational speed (700～3450 rpm), and the vertical axis represents flow rate (0～1.25 m³/h). For example, at a rotational speed of 1000 rpm, the flow rate is approximately 0.2 m³/h; at 2000 rpm, it is approximately 0.4 m³/h; and when reaching the rated rotational speed of 3000 rpm, the flow rate stabilizes at 0.6 m³/h.

If you need to calculate the target speed based on actual needs, the formula is as follows:

Selected Motor Speed (r/min) = (Required Flow Rate (m³/h) × Rated Speed 3000 (r/min)) / Rated Flow Rate 0.6 (m³/h)
For instance, when a seawater desalination system requires a flow rate of 0.4 m³/h, the required rotational speed is (0.4×3000)/0.6 = 2000 rpm, making the calculation convenient.

Installation and Operation Instructions

Key Installation Requirements

• Interface Identification: The port marked "I" on the pump body is the inlet, and "O" is the outlet. The installation direction must be strictly distinguished to avoid pump damage due to reverse connection;

• Motor coupling: A clearance of 3 to 5 mm must be maintained between the pump and motor couplings. The pump shaft must not be subjected to axial or radial loads to prevent premature wear of the shaft seal and bearings. The installation reference diagram is as follows:

• 

• Foundation and Piping: It is recommended to install the pump unit on a base with vibration dampers to reduce vibration and noise; the diameter of the inlet pipe should not be smaller than the pump inlet size (G1/2〞), and bends and joints should be minimized to reduce pressure loss.

Operation Precautions Specific to Seawater Desalination/Industrial Desalination Scenarios

1. Filtration Configuration: Impurity particles in seawater and industrial wastewater can wear 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. Bag filters or spiral wound filters with only 90% efficiency should be avoided;

2. Pressure Protection: A low-pressure control switch (set to 1 Bar) should be installed at the inlet end, which will automatically shut down the pump when the pressure is lower than this value to prevent idling. A high-pressure control switch (set to 70 Bar) and a safety valve (pressure adjustment range 5～9 MPa, customizable) should be installed between the pump outlet and the reverse osmosis membrane to prevent damage to the membrane module due to system overpressure;

3. Start-Up, Shutdown and Flushing: In high-salinity scenarios (such as seawater desalination), the pump cavity must be flushed with fresh water after each shutdown to discharge residual concentrated brine and prevent blockage caused by salt crystallization; 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, as this may trigger the safety valve or cause pipeline burst.

Power Parameters

The power of DHP 0.6 varies with the working pressure. The power requirements at the rated speed of 3000 rpm are as follows:

The working pressure of seawater desalination systems is usually 70～80 Bar, so a 2.2 kW motor is recommended to ensure stable pump operation without energy waste.

Dimensional Parameters

Inlet and Outlet Dimensions

Overall Dimensions (with Independent Fan Motor/Inverter Motor, Unit: mm)

The following are dimensional examples of DHP 0.6 matched with commonly used motors, which can be used for installation space planning:

High-Pressure Piston Pump Maintenance and Warranty Service (for DHP 0.6)

Daily Maintenance Key Points

• Lubrication Management: The transferred fluid is used as the lubricating medium, so no additional lubricating oil is needed. Daily maintenance only requires judging whether to replace the filter element based on the filter pressure difference to ensure clean inlet fluid;

• Regular Inspection: Under standard operating conditions (10 μm filtration, normal pressure/speed), a comprehensive inspection is recommended every 8000 hours. Focus on checking the sealing performance of the shaft seal and the wear of plungers and plunger sleeves, and replace worn parts in a timely manner;

• Corrosion Protection: The pump body is made of 2205 duplex stainless steel (with excellent corrosion resistance), but in high-salinity scenarios such as seawater desalination, the shutdown flushing process must be strictly implemented to avoid local corrosion caused by residual salt.

Warranty Service

• 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 pump 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: Fault detection, on-site maintenance, factory repair and spare parts supply services are provided to ensure the continuous and stable operation of seawater desalination and industrial desalination systems.

Manufacturer's Contact Information

• 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

Company Introduction

WUXI FENIGAL SCIENCE AND TECHNOLOGY CO., LTD. (FG Water Technologies), the manufacturer of DHP 0.6, has focused on the research and development of high-pressure piston pumps since 1990 and is the first domestic enterprise 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, effectively solving the bottleneck problem of relying on imported products in related fields.

The enterprise collaborates with its OEM partner Shenzhen CW Environment Technology to widely apply axial high-pressure piston pumps in fields such as seawater desalination, industrial desalination and membrane concentration. It always adheres to the tenet of "quality first, integrity-based, customer satisfaction", continuously improves the supply chain and sales service system, and is committed to providing customers with efficient core fluid equipment and technical solutions to support the implementation of the "Made in China 2025" strategy and industrial foundation strengthening strategy.

PDF manual download address:DHP type plunger pump selection manual