DHR 4 Multistage Centrifugal Pumps

Summary

Product identification

• DHR series pumps are horizontal, non-self-priming multistage centrifugal pumps.
• Impellers and diffusers are made of stainless steel AISI 304.
• Threaded ports are set for oval fittings (range DHR 9).

Applications

• Lifting and distribution of water in domestic systems in continuous or intermittent operation.
• Pressurization systems.
• Washing, irrigation, gardens, fountains.

Operating limits

• Maximum ambient temperature: 50°C
• Maximum temperature of the liquid: 90°C
• Maximum recommended intake height: 6 m with foot valve (with liquid temperature at 50°C)
• Maximum operating pressure:
  • 10 bar (with liquid temperature 50°C)
  • 6 bar (with liquid temperature 90°C)
• Continuous service.

Feed water

• Type of liquid: clean water without suspended solids or abrasive material.

Electrical

• Motor type: Closed, ventilated from exterior.
• Degree of protection: IP 54.
• Insulation class: F.
• Speed of rotation: 2850 rpm.
• Single-phase power supply: Includes capacitor permanently on and thermal protection built into the motor casing.
• Three-phase power supply: Requires external protection provided by the user.
• Performance tables provide specific values for Nominal power (P2) in HP/kW, Absorbed power (P1) in HP/kW, Voltage (V), Current (In A), and Capacitor (μF) for various models. See the official PDF for exact tabulated values.

Mechanical / hydraulic

• All rotating parts that come into contact with the pumped liquid are made of stainless steel AISI 304.
• Materials of Construction:
  • Intake and supply flange: Cast iron GJL 200 (ASTM Class 35)
  • Motor body: Cast aluminium
  • Impellers: Stainless steel X5CrNi18-10 (AISI 304)
  • Diffusers: Stainless steel X5CrNi18-10 (AISI 304)
  • Sleeve: Stainless steel X5CrNi18-10 (AISI 304)
  • Shaft (part in contact with water): Stainless steel X5CrNi18-10 (AISI 304)
  • Gaskets: NBR
  • Mechanical seal: Ceramic / Graphite / NBR
• Hydraulic Performance:
  • Hydraulic performance curves are provided in the PDF for DHR 2, DHR 4, and DHR 9 series, showing head (Hl [m]), efficiency (η [%]), and NPSH [m] against flow rate (l/min, m³/h). See the official PDF for detailed graphs.
  • Performance tables list flow rate (Q in l/min and m³/h) and head (m.c.w.) for various models. See the official PDF for exact tabulated values.
• Dimensions and Weights:
  • Overall dimensions (A, B, C, D, E, F, G, H, I, L, M, N in mm) and weights (Kg) are provided for DHR 2, DHR 4, and DHR 9 series.
  • Intake (DNA) and Delivery (DNM) port sizes are also specified in these tables (e.g., 1", 1" 1/4, 1" 1/2).
  • See the official PDF for exact tabulated values.

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror