W Single-Stage Cantilever Vortex Pump

Product Description

Model Code Explanation

Product Overview

The W series single-stage cantilever vortex pump is designed for handling clean water and liquids with physical and chemical properties similar to water. The medium temperature must not exceed 80 °C. Vortex pumps are commonly used as boiler feed pumps and are widely applied in shipbuilding, textile, chemical, metallurgical, machinery manufacturing, aquaculture, fixed fire-fighting pressure boosting, heat-exchanger packages and long-distance agricultural sprinkler irrigation.

The W series vortex pump is a single-stage cantilever vortex pump, with both suction and discharge nozzles arranged vertically upward. The vortex impeller can move freely along the shaft in the axial direction so that the axial clearance between the impeller and the pump casing/pump cover is equal on both sides, and the clearance can be adjusted by paper shims. Two shaft seal options are available: packed gland seal and single-face mechanical seal. The pump and motor are mounted together on a common baseplate.

The W series vortex pump is suitable for transferring non-corrosive liquids without solid particles, with a temperature range from -20 °C to +80 °C and a viscosity not greater than 5E. The pump is compact in size, light in weight, with a neat appearance and easy maintenance. It is suitable for industrial water supply in chemical, petroleum, textile, power and other plants, boiler feed water, hot water circulation for heating, high-rise building boosting, fire-fighting, heat removal circulation, high-pressure water supply for producing chilled beverages and cooling drinks, and for tableware disinfection in canteens and catering applications.

Typical performance range: maximum flow rate 14.4 m³/h, minimum flow rate 0.7 m³/h; maximum head 105 m, minimum head 20 m; motor power from 0.75 kW up to 11 kW; rated speed 2900 r/min.

Product Features

The W series single-stage cantilever vortex pump features a compact structure, attractive appearance, small footprint, low noise, reliable operation and easy maintenance. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, photographic processing, research institutes and defense industry for handling acids, alkalis, oils, rare and precious liquids, toxic and volatile liquids, and for supporting circulation water systems and filter units. It is especially suitable for transferring media that are prone to leakage, flammability and explosion, making this pump an ideal choice for such applications.

Structure Illustration

1	Pump casing
2	Pump cover
3	Impeller
4	Bracket assembly
5	Pump shaft
6	Jaw-type flexible coupling
7	Special cartridge mechanical seal assembly

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.

Its working principle is as follows: 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.

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. Vortex pumps therefore have excellent self-priming performance.

The theoretical head and flow of a vortex pump can be expressed as:

H = φu² / (2g)
Q = cF

Where:
u — impeller peripheral speed;
φ — coefficient, typically 3.5–4.5;
F — cross-sectional area of the channel;
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.

Performance Parameters

Model	Flow Rate (m³/h)	Head (m)	Voltage (V)	Speed (r/min)	Power (kW)
20W-20 (single-stage)	0.72	20	220/380	2900	0.75
20W-65 (single-stage)	0.72	65	380	2900	2.2
25W-25 (single-stage)	1.44	25	220/380	2900	0.75
25W-70 (single-stage)	1.44	70	380	2900	3
32W-30 (single-stage)	2.88	30	380	2900	1.5
32W-75 (single-stage)	2.88	72	380	2900	4
32W-120 (single-stage)	2.88	120	380	2900	5.5
40W-40 (single-stage)	5.4	40	380	2900	4
40W-90 (single-stage)	5.4	90	380	2900	7.5
50W-45 (single-stage)	9	45	380	2900	5.5
65W-50 (single-stage)	14.4	50	380	2900	11

Inspection and Maintenance Notes

Clearances to be checked during overhaul of the vortex pump include:

1. 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.
2. Radial clearance between the impeller and the pump casing.
   Typically c = 0.15–0.20 mm in the radial direction, measured using feeler gauges.
3. Bearing clearance.
   Generally b ≈ 0.10 mm, measured with feeler gauges or a vernier caliper.
4. Coupling assembly clearance.
   Typically i = 1 mm, d = 4 ± 0.5 mm, measured with a vernier caliper and depth gauge.
5. Fits between the impeller and key, and between the impeller and shaft are sliding fits.
   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.

Start-up, Shutdown and Operation

1. 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.
2. 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.
3. 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.
4. Perform a test start: jog the motor and adjust the wiring to ensure that the rotation direction matches the specified direction.
5. 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.)
6. 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.
7. For shutdown, first close the pressure gauge valve, stop the motor, and then promptly close the discharge and suction valves.
8. 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

1. 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.
2. If any abnormality or fault is detected, stop the pump immediately and investigate the cause before restarting.

 

 

OEM & Custom Solutions

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 for Overseas Buyers

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.