• DHP 3.5 Axial Piston Pump - 3.5m³/h High-Pressure Water Treatment Consumables for Low-Medium Speed Desalination
  • DHP 3.5 Axial Piston Pump - 3.5m³/h High-Pressure Water Treatment Consumables for Low-Medium Speed Desalination
  • DHP 3.5 Axial Piston Pump - 3.5m³/h High-Pressure Water Treatment Consumables for Low-Medium Speed Desalination
DHP 3.5 Axial Piston Pump - 3.5m³/h High-Pressure Water Treatment Consumables for Low-Medium Speed Desalination

DHP 3.5 Axial Piston Pump - 3.5m³/h High-Pressure Water Treatment Consumables for Low-Medium Speed Desalination

Product Details:

Place of Origin: China
Brand Name: Fenigal
Certification: CE
Model Number: DHP 4.5

Payment & Shipping Terms:

Minimum Order Quantity: 1 pc
Price: Negotiable
Packaging Details: standard export packing
Supply Ability: 60000 Units per Month
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Detail Information
Product Model: DHP 3.5 Geometric Displacement: 25 Cm³/rev
Rated Flow At Rated Speed (1650 Rpm): 3.5 M³/h (equivalent To 58.3 L/min In Minute Flow Rate) Minimum Outlet Pressure: 20 Bar
Maximum Continuous Outlet Pressure: 80 Bar (For Higher Or Lower Pressure Requirements, Please Contact FENIGAL Sales Representative)
Highlight:

DHP 3.5 axial piston pump

,

high-pressure water treatment consumables

,

low-medium speed desalination pump

Product Description

The DHP 3.5 axial piston pump, a stable and integrated water treatment consumable from WUXI FENIGAL, is tailored for low-to-medium speed, high-stability scenarios—ideal for small/medium seawater desalination and industrial wastewater desalination systems. As a key model in the DHP3.5～4.0 series, it stands out with low-speed stability, strong corrosion resistance, and simplified installation, becoming a reliable core fluid equipment for desalination projects.


Operating on the axial piston principle, its plungers (parallel to the drive shaft) reciprocate in bores to adjust pump cavity volume, enabling efficient transfer of high-pressure, low-viscosity corrosive media (seawater, industrial saline wastewater). Unlike traditional pumps, it uses the transported fluid as lubricant, eliminating oil tanks and oil leakage to meet desalination’s strict cleanliness demands. The integrated flushing check valve further simplifies RO membrane system piping, reducing installation space, costs, and system complexity.

Core Advantages for Water Treatment

  • Low Speed & High Stability: 1650 rpm rated speed delivers 3.5 m³/h flow, with minimal pulses, low vibration, and ≤77 dB(A) noise (per EN ISO 3744-2010)—perfect for long-term continuous operation in island desalination stations and factory wastewater lines.
  • Strong Corrosion Resistance & Integration: Key components use 2205 duplex stainless steel, resisting high-salinity corrosion. Integrated flushing check valve streamlines piping design, lowering installation and maintenance burdens.

Core Technical Parameters of DHP 3.5

Parameter Category Specific Value
Product Model DHP 3.5
Geometric Displacement 25 cm³/rev
Rated Flow (1650 rpm) 3.5 m³/h (58.3 L/min)
Minimum Outlet Pressure 20 Bar
Maximum Continuous Outlet Pressure 80 Bar (Contact FENIGAL sales for other requirements)
Minimum/Maximum Inlet Pressure 2 Bar / 5 Bar
Continuous Operating Speed Range 700～1650 rpm
Operating Noise (EN ISO 3744-2010) ≤77 dB(A) (measured on full unit at max pressure/speed)
Power (1650 rpm & 80 Bar) 11.0 kW
Medium Temperature 2～50 ℃ (NaCl concentration-dependent)
Ambient Temperature 0～50 ℃
Overall Weight 18 kg
Integrated Component Flushing Check Valve
Core Application Small/medium seawater desalination, industrial wastewater desalination, resource recovery

Power Parameters (1650 rpm Rated Speed)

Pump Model Rated Flow (L/min) Rated Flow (m³/h) Power at 60 Bar Power at 70 Bar Power at 80 Bar Rated Speed (rpm)
DHP 3.5 58.3 3.5 7.5 kW 11.0 kW 11.0 kW 1650

Inlet & Outlet Dimensions

Piston Pump Model Inlet Size Outlet Size
DHP 3.5 G1-1/4〞, 20 mm Depth G3/4〞, 20 mm Depth

Overall Dimensions (mm, with Motor)

Piston Pump A B H K P AD HD C D L G IEC Motor
DHP 3.5 216 140 132 12 300 220 350 203 155 520 878 5.5 kW - 4P
DHP 3.5 216 178 132 12 300 220 350 203 204 560 967 7.5 kW - 4P
DHP 3.5 254 210 160 15 350 260 420 203 204 605 1012 11 kW - 4P

Installation & Operation Tips

  1. Interface Connection: "I" = inlet (G1-1/4〞, 20 mm), "O" = outlet (G3/4〞, 20 mm). Strictly avoid reverse connection to prevent check valve/plunger damage; match pipeline specs.
  2. Filtration Requirement: Install 10 μm absolute filter (≥99.98% efficiency, β10>5000) at inlet—prohibit 90% efficiency filters to avoid plunger sleeve wear.
  3. Pressure Protection: Inlet low-pressure switch (2 Bar) prevents dry running; outlet high-pressure switch (70 Bar) + safety valve (5-9 MPa) protects RO membranes/pipelines.
  4. Start-Up/Shutdown: Flush with fresh water after shutdown (add bactericide if >15 days shutdown). Never start with rear valve closed.

Maintenance & Warranty

  • Daily Maintenance: Check filter pressure difference (replace element if >0.5 Bar) to keep inlet fluid clean.
  • Regular Inspection: Full inspection every 8000 hours (check shaft seal leakage, plunger wear—replace parts if flow drops >10%).
  • Warranty: 1-year free maintenance (delivery date); 8000-hour maintenance-free warranty (if operated as required, max 18 months).

Manufacturer 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, China
  • Tel: +86-510-85163211
  • Mobile: +86-13646187144
  • Email: sales@fgwater.com

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