Backwash Pump

Product Specifications

Technical details and manufacturing context for Backwash Pump

Definition

The Backwash Pump is a component used in backwash systems to generate the hydraulic pressure and flow required to reverse the flow direction through filtration units. Its primary function is to dislodge accumulated contaminants, debris, and particulates from filter media—such as sand, activated carbon, or membrane surfaces—by forcing clean water backwards through the system. This process restores filtration efficiency, prevents clogging, and extends the operational lifespan of the filtration equipment.

The pump converts mechanical energy from an electric motor into hydraulic energy. It draws clean water from a storage tank or supply line and pressurizes it to create a high-velocity reverse flow through the filtration vessel. This turbulent flow fluidizes the filter media, scrubbing away trapped impurities, which are then discharged to waste. Operation is typically controlled by automated timers, pressure differential sensors, or manual initiation as part of the system's maintenance cycle.

Typical parameters for such pumps include a flow rate of 15–60 m³/h, a head of 20–40 m, an operating pressure of 1.0–1.6 MPa, and a motor power of 5.5–22 kW. Standard electrical supply is three-phase, 380 V, 50 Hz. The maximum liquid temperature is 80°C, and the maximum ambient temperature is 40°C. Ingress protection ratings range from IP54 to IP65. Pump casing and impeller materials are typically stainless steel (304 or 316), with mechanical shaft seals. Weight ranges from 80 to 250 kg. These values are reference ranges and must be verified for the specific model and application.

Relevant standards include ISO 9906 for hydraulic performance, IEC 60034-1 for motors, IEC 60038 for voltage and frequency, IEC 60529 for ingress protection, ASTM A743 for castings, and API 682 for mechanical seals. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The pump operates by converting mechanical energy from an electric motor into hydraulic energy. It draws clean water from a storage tank or supply line and pressurizes it to create a high-velocity reverse flow through the filtration vessel. This turbulent flow fluidizes the filter media, scrubbing away trapped impurities which are then discharged to waste. Operation is typically controlled by automated timers, pressure differential sensors, or manual initiation as part of the system's maintenance cycle.

Common Materials

Cast Iron, Stainless Steel (304/316), Bronze, EPDM/ Viton Seals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Rate	15–60 m³/h	Required for effective backwash velocityISO 9906
Head	20–40 m	Must overcome filter media resistanceISO 9906
Motor Power	5.5–22 kW	Match to flow and head requirementsIEC 60034-1
Voltage	380 V	Three-phase, 50 HzIEC 60038
Frequency	50 Hz	Standard industrial supplyIEC 60038
Max Liquid Temperature	80 °C	Above this, seals degradeISO 2858
Max Ambient Temperature	40 °C	Higher ambient reduces motor lifeIEC 60034-1
Ingress Protection	IP54–IP65	IP65 for outdoor or washdownIEC 60529
Pump Casing Material	304–316 SS	316 for corrosive waterASTM A743
Impeller Material	304–316 SS	Corrosion resistanceASTM A743
Shaft Seal Type	Mechanical	Cartridge seal for reliabilityAPI 682
Weight	80–250 kg	Depends on pump size and motor

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Impeller
Rotates to impart kinetic energy to the water, creating flow and pressure.

Material: Stainless Steel or Bronze
Casing/Volute Part
Houses the impeller and converts kinetic energy into pressure by gradually expanding the flow path.

Material: Cast Iron or Stainless Steel
Shaft Part
Transmits torque from the motor to the impeller.

Material: Stainless Steel
Mechanical Seal
Prevents leakage along the shaft where it exits the pump casing.

Material: Ceramic/Carbon faces with EPDM/Viton elastomers
Motor
Provides the rotational mechanical power to drive the pump.

Material: Copper windings, steel laminations, aluminum/iron housing

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Backwash System

View system integration details

Manufacturers of Backwash Pump

Manufacturer profiles associated with Backwash Pump.

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Frequently Asked Questions

What is the primary function of a backwash pump?

The primary function is to generate high-pressure water flow to reverse the flow direction through filtration units, dislodging contaminants from filter media and restoring filtration efficiency.

What are typical flow rate and head ranges?

Typical flow rate is 15–60 m³/h, and head is 20–40 m, per ISO 9906. These are reference ranges; confirm for your specific model.

What materials are commonly used for the pump casing and impeller?

Common materials are stainless steel grades 304 or 316, as per ASTM A743. The choice depends on water corrosiveness.

Which standards apply to backwash pumps?

Relevant standards include ISO 9906, IEC 60034-1, IEC 60038, IEC 60529, ASTM A743, and API 682. Always verify compliance with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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pressure:	Up to 10 bar (145 psi) discharge pressure
flow rate:	10-200 m³/h (44-880 gpm)
temperature:	0°C to 80°C (32°F to 176°F)
slurry concentration:	Up to 5% solids by weight

Product Specifications

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