DPV Vertical centrifugal pumps

Summary

Product Identification

The DPV series are vertical, multi-stage centrifugal pumps designed for pumping clean or lightly aggressive watery mediums. Suction and discharge connections are in-line.

Available series: DPV(C/S) 2, 4, 6, 10, 15, 25, 40, 60, 85, 125. The pumps operate at 50 Hz (DIN/IEC).

Model Key

The model key indicates:

• Product Label: DP
• Material/Construction:
  • VC: Cast Iron pump foot and top bracket, hydraulics 1.4301 / AISI 304
  • V: All wetted parts Stainless Steel 1.4301 / AISI 304
  • VM: All wetted parts Stainless Steel 1.4301 / AISI 304 with closed coupled motor
  • VS: All wetted parts Stainless Steel 1.4401 / AISI 316
• Connections:
  • E: Male thread (with non-return valve insert)
  • Oval flange with female thread
  • F: Round flange
  • V: Victaulic connections
  • T: Tri-clamp connections
• Capacity: In m³/h at Q.opt. (e.g., '85' for 85 m³/h)
• Number of stages: (e.g., '/3')
• Number of stages of which one stage with reduced head: (e.g., '/3-1')
• Impeller low NPSH: L (for models 2, 4, 6, 10 and 15)
• Design version: B

Operating Limits

• Ambient temperature: -20 up to 40 °C
  • Note: If ambient temperature exceeds this value or motor is located more than 1000 m above sea level, motor cooling is less effective and may require adapted motor power. See the official PDF for detailed tables on increased required motor power.
• Minimum inlet pressure: NPSHreq. + 1m
• Viscosity: 1-100 cSt
  • Note: Deviation in viscosity and/or density could require adapted motor power.
• Density: 1000-2500 kg/m³
• Cooling: Forced motor cooling
  • Note: The free space above the motor cooling fan must be at least 1/4 of the diameter of the inlet of the cooling fan for sufficient airflow.
• Minimum frequency: 30 Hz
• Maximum frequency: 60 Hz
  • Note: Pumps that are intended for 50 Hz operation may not be connected to 60 Hz power supply.
• Allowable size of solids pumped: 5µm to 1mm
• Temperature range (basic pump model): -20 up to 140 °C
  • Exception: DPV 125 can be used up to 120 °C.
• VE casing (with non-return valve) max. temperature: 90 °C
• Mono-block motor version VM max. fluid temperature: 60 °C

Minimum Capacity

To prevent overheating, gas gathering, or cavitation, a minimum capacity (Qmin) must be secured. This corresponds to a percentage of the optimum flow (Qopt) in relation to the liquid temperature.

• Minimum capacity (Qmin) at 20 °C (50 Hz):
  • DPV 2: 0.2 m³/h (2 pole), 0.2 m³/h (4 pole)
  • DPV 4: 0.4 m³/h (2 pole), 0.5 m³/h (4 pole)
  • DPV 6: 0.6 m³/h (2 pole), 0.8 m³/h (4 pole)
  • DPV 10: 1.1 m³/h (2 pole), 0.5 m³/h (4 pole)
  • DPV 15: 1.6 m³/h (2 pole), 0.8 m³/h (4 pole)
  • DPV 25: 2.6 m³/h (2 pole), 1.3 m³/h (4 pole)
  • DPV 40: 4 m³/h (2 pole), 2 m³/h (4 pole)
  • DPV 60: 6 m³/h (2 pole), 3 m³/h (4 pole)
  • DPV 85: 8.5 m³/h (2 pole), 4.3 m³/h (4 pole)
  • DPV 125: 13.1 m³/h (2 pole)
• For higher temperatures, see the official PDF for the "Minimum capacity vs. temperature (in % of Q optimum)" table.

Feed Water

The pumps are designed for "clean, or lightly aggressive, watery mediums." Performance characteristics are based on:

• De-aerated water at a temperature of 20 °C
• Density of 1.0 kg/dm³
• Kinematical viscosity of 1 mm²/s (1 cSt)

Electrical

• Rated speed at 50 Hz (2 pole):
  • 0.37 and 0.55 kW: 2800 rpm
  • to 2.2 kW: 2880 rpm
  • to 4 kW: 2920 rpm
  • to 7.5 kW: 2940 rpm
  • to 22 kW: 2950 rpm
  • to 45 kW: 2960 rpm
• Rated speed at 50 Hz (4 pole):
  • 0.55 kW: 1450 rpm
  • 0.75 kW: 1440 rpm
  • to 2.2 kW: 1425 rpm
  • to 4 kW: 1450 rpm
  • to 7.5 kW: 1460 rpm

Mechanical / Hydraulic

• Construction: Vertical, single or multi-stage centrifugal pump with in-line suction and discharge.
• Hydraulic Parts Material: All hydraulic parts are made of stainless steel.
• Basic Material Variants:
  • V: Hydraulic 1.4301, Casing 1.4308, Sealing EPDM
  • VS: Hydraulic 1.4404, Casing 1.4408, Sealing FPM
  • VC (2-15): Hydraulic 1.4301, Casing JS1030, Sealing EPDM
  • VC (25-125): Hydraulic 1.4301, Casing JL1040, Sealing EPDM
• Pump Bearing: Medium lubricated stage bearing, Tungsten Carbide against Ceramic.
• Measuring, Draining, and Venting Connections:
  • Connection (E): G ¼ for draining inlet or measuring inlet/suction pressure.
  • Connection (F): G ¼ for draining outlet or measuring discharge pressure.
  • Connections (G): G 3/8 for venting pump system or measuring discharge pressure.
• Performance Characteristics: Detailed hydraulic performance curves, efficiency, NPSHreq, and shaft power are available for each model in the official PDF, in accordance with ISO 9906:2012 (Grade 3B). See the official PDF for exact tabulated values.
• Low NPSH Impeller: An optional low NPSH impeller solution is available for DPV(C/S) 2, 4, 6, 10, and 15 series. This option provides better NPSH values to prevent cavitation in critical inlet conditions. Using a low NPSH impeller results in slight adjustments to the performance curve but no change in pump height or connection.
• Minimum Efficiency Index (MEI) for design version B:
  • DPV 2: MEI ≥ 0.70
  • DPV 4: MEI ≥ 0.70
  • DPV 6: MEI ≥ 0.70
  • DPV 10: MEI ≥ 0.70
  • DPV 15: MEI ≥ 0.40
  • DPV 25: MEI ≥ 0.70
  • DPV 40: MEI ≥ 0.70
  • DPV 60: MEI ≥ 0.70
  • DPV 85: MEI ≥ 0.60
  • DPV 125: MEI ≥ 0.70
• Dimensions: Detailed dimensions (in mm) and weights (in kg) for various models and motor types (VM closed coupled, V18 coupled, V1 coupled) are provided in the official PDF. See the official PDF for exact tabulated values.

Approvals

• CE: Conformity with European Safety Directive
• ACS: Drinking Water Approval (F)
• WRAS: Drinking Water Approval (GB)
• ATEX: Conformity with “ATmosphères EXplosibles” Directive

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. For contractual data, always refer to the specific OEM PDF revision used on your project.

Official datasheet (PDF)

Lenntech datasheet mirror