Product Overview
The W Series Single-Stage Overhung Vortex Pump is specifically designed for clean water and liquids with similar physical and chemical properties to water. It is suitable for medium temperatures up to 80°C. The pump adopts a single-stage overhung vortex design, with both the suction nozzle and discharge nozzle arranged vertically upwards. The pump and motor are mounted on a common base, designed for non-corrosive liquids without solid particles.
Model Designation
Key Features
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Single-Stage Overhung Vortex Structure: Suitable for low-flow/high-head applications.
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Compact Design: Small footprint, lightweight, clean appearance, reliable operation, and low noise.
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Axial Floating Impeller: Gap adjustment based on washer, ensuring high efficiency and maintainability.
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Seal Options: Packing gland seal (stuffing box) or single mechanical seal options available.
Engineering Overview
The W series uses a vortex (peripheral/side channel) pumping principle, with a star-shaped vortex impeller rotating between the cover plate and discontinuous flow passages. Through repetitive cycles, the medium gradually increases in energy, exhibiting typical “low-flow/high-head” performance. The characteristic curve is similar to a high-head centrifugal pump but steeper, typically with lower flow and moderate efficiency. Typical performance range: flow rate of 0.7–14.4 m³/h, head of 20–105 meters, motor power of 0.75–11 kW, rated speed of 2900 rpm.
Typical Applications
The W series is commonly used for:
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Boiler Intake Pumps: Provides stable boiler intake flow.
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Shipbuilding, Textiles, Chemicals, Metallurgy: For various industrial liquid transfer applications.
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Aquaculture: Used for water quality circulation and oxygenation.
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Fire Fighting Pressure Boosting/Stable Systems: Ensures reliable water pressure in fire fighting systems.
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Heat Exchangers: Provides fluid transfer for hot water circulation and cooling systems.
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Agricultural Irrigation: For long-distance agricultural irrigation systems.
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Catering: Hot water circulation and dishwashing in catering applications.
System Configuration
The W Series Vortex Pump system consists of the following key components:
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Hydraulic End: Casing, cover, vortex impeller, and fluid.
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Axial Flow Adjustment Device: Gap adjustment via paper gasket.
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Seal Components: Bag seal or single mechanical seal.
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Motor and Common Base: Ensures stable pump and motor operation.
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Vertical Upward Suction/Discharge Connection: Simplifies installation and piping connection.
Components and Supply
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Motor: High-efficiency motor ensuring stable operation.
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Vortex Impeller: Precisely designed to provide efficient fluid propulsion.
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Installation System: Simplifies installation and optimizes space usage.
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Seal System: Offers both packing gland and mechanical seal options to suit various operating conditions.
Technical Service
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24/7 customer service and technical support available.
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Regular maintenance and inspections to ensure optimal pump performance.
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Customized solutions based on customer requirements, optimizing pump system configuration and performance.
Operating Conditions
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Operating Medium: Clean water or similar liquids; free of solid particles; non-corrosive.
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Operating Temperature: Suitable for temperatures from -20°C to +80°C (maximum temperature not exceeding 80°C).
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Viscosity: ≤5E.
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Applicability Note: The side gap should not be excessive, as it could significantly reduce efficiency. This pump is mainly used for relatively clean liquids.
Service Conditions
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Regular inspection of sealing performance to ensure no leakage.
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Periodic tightening of all components to ensure the stability and safety of the equipment.
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Avoid dry running to ensure proper lubrication and cooling.
Protection Features
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Overload Protection: Prevents pump damage from overload operation.
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Temperature Control Protection: The motor automatically stops if the temperature exceeds preset limits.
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Low Liquid Level Protection: Automatically detects liquid levels to avoid dry running.
Selection Criteria
When selecting the W Series Vortex Pump, consider the following criteria:
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Medium Type: Choose the appropriate pump based on the characteristics of the liquid being conveyed.
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Installation Environment: Select a model suitable for the available installation space and environmental conditions.
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Flow and Head Requirements: Choose the appropriate flow and head based on process requirements.
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Energy Efficiency: Select energy-efficient pumps to reduce operating costs.
Specifications & Installation
Outline Drawing
Performance Data
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1
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Pump casing
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2
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Pump cover
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3
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Impeller
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4
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Bracket assembly
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5
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Pump shaft
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6
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Jaw-type flexible coupling
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7
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Special cartridge mechanical seal assembly
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Performance Parameters
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Model
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Flow Rate (m³/h)
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Head (m)
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Voltage (V)
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Speed (r/min)
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Power (kW)
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20W-20 (single-stage)
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0.72
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20
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220/380
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2900
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0.75
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20W-65 (single-stage)
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0.72
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65
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380
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2900
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2.2
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25W-25 (single-stage)
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1.44
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25
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220/380
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2900
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0.75
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25W-70 (single-stage)
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1.44
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70
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380
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2900
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3
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32W-30 (single-stage)
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2.88
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30
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380
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2900
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1.5
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32W-75 (single-stage)
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2.88
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72
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380
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2900
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4
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32W-120 (single-stage)
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2.88
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120
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380
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2900
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5.5
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40W-40 (single-stage)
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5.4
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40
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380
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2900
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4
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40W-90 (single-stage)
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5.4
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90
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380
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2900
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7.5
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50W-45 (single-stage)
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9
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45
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380
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2900
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5.5
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65W-50 (single-stage)
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14.4
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50
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380
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2900
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11
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Operating Manual
Operating Principle
A pump that uses a star-shaped impeller rotating between cover plates with discontinuous flow channels to transfer liquid is called a vortex pump.
When the star-shaped impeller rotates, centrifugal force is generated. Under this centrifugal force, the liquid flows from the side port of the pump casing into the impeller eye and is thrown out towards the periphery, entering the flow channels in the cover plates on both sides. The liquid initially moves with the impeller in circular motion and therefore has a certain velocity head. In the cover-plate channels, part of the velocity head is converted into pressure head. The liquid is then picked up again by the impeller. During the passage of a liquid particle from the inlet to the outlet, this process is repeated many times, and the energy increases step by step, similar to liquid flowing through multiple impeller stages in a multistage centrifugal pump.
Self-Priming & Discharge
The liquid moves in the channels with the star-shaped impeller. When it reaches the cut-off point, the channel is suddenly blocked, and the liquid is discharged through the outlet port. The outlet port is set in the discharge-side cover plate. The inlet port is located on the suction-side cover plate at the position where the channel suddenly appears after the cut-off section, where a negative pressure is formed to draw liquid into the pump. Therefore, vortex pumps have excellent self-priming performance.
Pump Characteristics
The theoretical head and flow of a vortex pump can be expressed as:
H = φu² / (2g)
Q = cF
Where:
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u — impeller peripheral speed
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φ — coefficient, typically 3.5–4.5
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F — cross-sectional area of the channel
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c — liquid velocity in the channel, approximately c = u/2 or (0.55–0.65)u
The number of impeller vanes is generally between 24 and 60. The characteristic curve of a vortex pump is similar to that of a high-head centrifugal pump but steeper, with relatively small flow and high head, and moderate efficiency. The side clearance of the vortex pump (i.e., the gap between the impeller and the cover plates) must not be too large; otherwise, the efficiency will drop significantly. Therefore, this type of pump is suitable only for handling relatively clean liquids.
Inspection & Maintenance
Clearances to be checked during overhaul of the vortex pump include:
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Axial clearance between the impeller and the cover plates on both sides. Typically 2a = 0.17–0.20 mm, measured using a lead-wire compression method.
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Radial clearance between the impeller and the pump casing. Typically c = 0.15–0.20 mm in the radial direction, measured using feeler gauges.
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Bearing clearance. Generally b ≈ 0.10 mm, measured with feeler gauges or a vernier caliper.
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Coupling assembly clearance. Typically i = 1 mm, d = 4 ± 0.5 mm, measured with a vernier caliper and depth gauge.
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Fits between the impeller and key, and between the impeller and shaft are sliding fits.
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The top clearance of the key should not be less than 0.20 mm, and the side clearance should be 0.01–0.04 mm.
Operation & Handling
For W series pump sets with separate bearing housings, first check whether the bearing housing contains adequate calcium-based grease. If the pump has been stored for a long time, remove the bearing end cover to check whether the grease has deteriorated. If deterioration is found, replace the grease before starting.
Rotate the coupling by hand (for close-coupled pumps, remove the fan cover and rotate the motor fan) to confirm that the rotating assembly moves smoothly and evenly. Then use a spirit level to check the levelness of the pump set. After leveling, tighten the foundation bolts appropriately.
Measure the motor insulation resistance. If it is lower than 5 MΩ, the motor may be damp or damaged. If it is only damp, the insulation can usually be restored after running the motor for a period of time; otherwise, the motor must be repaired or replaced to avoid damage to the pump caused by faulty operation.
Perform a test start: jog the motor and adjust the wiring to ensure that the rotation direction matches the specified direction.
Open the suction valve and prime the pump casing. For pumps installed above the liquid level, a foot valve can be installed at the end of the suction pipe. Before start-up, fill the pump casing with the liquid being pumped. (For short suction lines, only the first start requires priming; thereafter, the residual liquid in the casing will generally be sufficient.)
Open the discharge valve, start the motor and observe the pressure gauge. Adjust the valve opening on the discharge line to obtain the appropriate pressure reading. The pump must not be operated with the discharge valve closed or at extremely low flow.
For shutdown, first close the pressure gauge valve, stop the motor, and then promptly close the discharge and suction valves.
For short shutdowns, if the ambient temperature is lower than the freezing point of the liquid, drain the liquid from the pump. For long-term shutdown, flush the pump, apply a light protective oil film, and store it properly.
Pump Operation
During operation, closely monitor the running status of the pump set, especially by checking whether the motor surface temperature is excessively high. For split-type pumps, also ensure that the bearing temperature does not exceed 70°C. If the motor overheats, check whether the pipeline is blocked or a valve is not fully open, causing excessive internal pressure. If the bearings overheat, check whether the amount of calcium-based grease is appropriate, whether the bearings are damaged, or whether there is misalignment between motor and pump.
If any abnormality or fault is detected, stop the pump immediately and investigate the cause before restarting.
OEM & Custom
We support OEM branding, special voltage customization (220V/380V), stainless steel or enhanced internal materials, customized gaskets, pump-motor baseplate customization, export packaging, and high-head or special temperature configuration adjustments.
FAQs
- 1. What liquids can the W vortex pump handle?
It handles clean water or similar liquids from -20°C to 80°C without solid particles. - 2. Is the pump suitable for high head applications?
Yes, the W vortex pump is designed for small flow and high head, up to 120 meters depending on the model. - 3. Can it be used for boiler feed?
Yes, it is widely used for boiler feed, heating, HVAC, and fire pressure systems. - 4. Does the pump have self-priming capability?
The vortex structure provides a strong self-priming effect. - 5. What seal types are available?
Packing seal and single-end mechanical seal are available. - 6. What is the maximum viscosity allowed?
The recommended viscosity is ≤5E for best efficiency. - 7. Do you provide OEM customization?
Yes, including voltage, materials, nameplate, components, and export packaging customization.