1W Single-Stage Direct-Coupled Vortex Pump

Product Description

Model Code Explanation

Product Overview

The 1W series single-stage direct-coupled vortex pump features a simple structure, safe and reliable operation, convenient maintenance, compact size and light weight. Its performance is stable and reliable, reaching an advanced level among similar products in the domestic market. Thanks to these advantages, the W series single-stage direct-coupled vortex pumps produced by our factory have won wide recognition and trust from users nationwide. (Materials available: stainless steel, cast iron)

Product Features

The 1W series direct-coupled single-stage vortex pump is characterized by a compact structure, attractive appearance, small footprint, low noise, reliable operation and easy maintenance. It is 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 media, as well as for supporting circulation water systems and filters. It is particularly suitable for transferring media that are prone to leakage, flammability or explosion, making this pump an ideal choice for such demanding applications.

Applications

The 1W series direct-coupled single-stage vortex pump is designed for handling clean water and liquids with physical and chemical properties similar to water. The medium temperature must not exceed 60 °C. It is commonly used as a small boiler feed pump and, thanks to its versatility, is widely applied in shipbuilding, textile, chemical, metallurgical, machinery manufacturing, aquaculture, fixed fire-fighting pressure boosting, heat-exchanger packages and long-distance agricultural sprinkler irrigation across various industrial sectors.

Structure Illustration

1	Motor shaft extension	9	Inner partition plate
2	Motor	10	Pin
3	Pump casing	11	Inner partition plate
4	Shaft collar	12	Impeller
5	Water-deflector ring	13	Coupling shaft
6	Key	14	Impeller key
7	Gland	15	Profiled seal ring
8	Flexible graphite packing	16	Pump cover
The 1W series vortex pump adopts a direct-coupled configuration between pump and motor, with the suction nozzle arranged horizontally and the discharge nozzle vertically upward. Viewed from the pump end, the pump rotates counterclockwise. The impeller can slide freely on the cantilever shaft so that it can automatically adjust the clearance on both sides during operation. The outer partition plate can be removed together with the impeller by means of two threaded holes on the impeller. The impeller and inner partition plate are made of 9-4 aluminum bronze, the shaft is made of stainless steel, and the packing uses a new sealing material — flexible graphite. This design ensures stable performance, simple construction and convenient dismantling.

Performance Parameters

Model	Flow Rate (m3/h)	Head (m)	Speed (r/min)	Power (kW)
1W2.4-10.5 (single-stage)	2.4	105	2900	3
1W2.5-12 (single-stage)	2.5	120	2900	3
25W-25 (single-stage)	1.44	25	2900	0.75
32W-30 (single-stage)	2.88	30	2900	1.5
32W-75 (single-stage)	2.88	75	2900	4
40W-40 (single-stage)	5.4	40	2900	4
40W-90 (single-stage)	5.4	90	2900	7.5
50W-45 (single-stage)	9	45	2900	5.5
65W-50 (single-stage)	14.4	50	2900	11
1.58D-0.7 (single-stage)	2.4	105	1450	3

Important Notes

1W2.5-12 Single-Stage Vortex Pump:

1. Before start-up, the pump casing and suction pipeline must be completely filled with liquid. Never start or run the pump when it is dry, otherwise seizing and serious damage may occur.
2. The discharge valve must be opened before starting in order to reduce the starting load on the motor. The pump must never be operated with the discharge valve fully closed.
3. The pumped liquid must not contain solid particles or debris, to avoid damage to the impeller caused by foreign matter entering the pump.
4. The stuffing-box leakage should be maintained at a normal rate, typically drip by drip.
5. During overhaul, in addition to replacing wearing parts, the bearings of the matching motor should generally also be replaced.
6. When continuous operation is required at a flow rate lower than the rated value, a bypass line should be used to recirculate part of the flow from the discharge side back to the suction side, controlled by a valve (with the discharge valve fully open). Do not simply throttle the discharge valve directly, in order to prevent the motor from running in an overloaded condition.

Start-up, Shutdown and Operation

Start-up and Shutdown

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 direct-coupled pumps, remove the motor fan cover and rotate the 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.

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, custom materials (stainless steel/cast iron), high-head customization, application-specific modifications, customized voltage/frequency, and export-oriented packaging solutions for distributors and equipment manufacturers.

FAQs for Overseas Buyers

1. What materials are available for the 1W vortex pump?
Stainless steel and cast iron options are available depending on chemical compatibility and application requirements.

2. Can the pump handle acidic or alkaline liquids?
Yes. The pump is suitable for acid, alkali, oil, volatile and special liquids when matched with appropriate materials.

3. What is the maximum working temperature?
The recommended liquid temperature is ≤60°C for optimal performance and service life.

4. Do you offer OEM branding for export?
Yes. We provide logo printing, nameplate customization, export packaging and long-term supply support.

5. Is the pump suitable for boiler feed applications?
Yes. The 1W vortex pump is commonly used in small boiler feed systems and circulation equipment.

6. What power supply standards are supported?
Standard models use 2900 rpm (50Hz). Custom voltage, 60Hz versions, and special motors are available.

7. How do you ensure product quality for overseas shipments?
Each pump undergoes performance testing, material inspection, and packaging reinforcement to ensure safe international delivery.