DN25-DN300 Direct-connected Self-priming Clean Water Pump

Model NO. PWSZXL

Flow Range：3.2-1200m³/h
Head Range：10-75m
Self - Priming Lift：5m
Motor Power：0.55-55kW
Inlet/Outlet Range：DN25-DN300

Quantity

Direct-connected Self-priming Clean Water Pump

An autonomous self priming pump streamlines operations by automatically removing air from suction pipes, ensuring seamless fluid flow without manual priming. The PWS Direct-Connected model features a robust direct-drive configuration that achieves a 5-meter suction lift without the need for a foot valve. Engineered for clean water and low-viscosity fluids, it merges high-speed priming capabilities with centrifugal power, making it a reliable solution for industrial, agricultural, and municipal water management.

Advantages of Self-Priming Pump

Direct-Drive Innovation

90%+ Transmission Efficiency: Motor-pump coaxial connection eliminates coupling losses, reducing vibration by 40% vs. traditional designs.
Maintenance Simplicity: Rear-access panel allows impeller/seal replacement without disassembling pipelines.

Clear Water Pump Optimization

Hydraulic Precision: Laser-welded stainless steel impeller minimizes turbulence, boosting efficiency 10-15% over cast iron pumps.
Zero Contamination: Smooth internal channels prevent sediment buildup, ensuring consistent clear water delivery.

Self Priming Pump Operational Principles

Vacuum Creation: Impeller rotation generates negative pressure, drawing air into the pump cavity.
Gas-Liquid Separation: Air escapes via discharge port while liquid recirculates to sustain suction.
Steady-State Operation: Functions as a high-efficiency self priming water pump , delivering up to 200 m³/h flow with minimal noise (<65 dB).
One-Time Priming: Initial water injection enables automatic operation for intermittent tasks like pipeline drainage.
Dual-Purpose Seals: Silicon carbide mechanical seals handle clean water and mild chemicals (pH 4-10).

Comparison Dimension	Direct-Coupled Pump (Key Focus)	Overhung (Bracket-Mounted) Pump
1. Structure & Installation	Compact & Alignment-Free: The impeller is mounted directly on the motor shaft (or close-coupled). Factory-integrated, requiring no complex laser alignment during installation.	Independent Structure & Alignment Required: Features a separate bearing housing and flexible coupling. Requires precise laser alignment during installation to prevent vibration.
2. Bearings & Maintenance	Fewer Parts & Simple Maintenance: Lacks a separate pump bearing box; fewer routine maintenance points (though motor bearings absorb some hydraulic loads).	Heavy-Duty Protection & Flexible Servicing: Separate bearing housing absorbs all hydraulic loads, protecting the motor. Often features a back pull-out design allowing maintenance without moving the motor.
3. Application & Cost	Cost-Effective for Moderate Duty: Lower initial purchase and installation costs; ideal for standard flow rates, medium-to-low power, and routine liquid transfer.	Durable for Severe & Heavy-Duty Service: Built for high power, high temperature, high pressure, or heavy continuous industrial operation; higher initial investment.

Q1: How does the self-priming function work, and do I need to fill the pump with water before the first startup?
A: Yes, for the very first startup, you must fill the pump casing with clean water to prime it. Once initially primed, its specialized self-priming internal design allows it to automatically evacuate air from the suction line and resume pumping without needing to re-prime during subsequent operations.

Q2: Does this direct-connected pump require professional laser alignment during installation?
A: No. Because of the close-coupled (direct-connected) design where the impeller is mounted directly or compactly aligned with the motor shaft, factory alignment is pre-set. This eliminates the need for complex on-site laser alignment, making installation much faster and easier.

Q3: What types of liquids can this pump handle, and can it be used for wastewater containing solids?
A: This is a clean water pump designed for pumping clean or treated water (such as drinking water, river/lake water, groundwater, or filtered rainwater). It is not recommended for handling sewage or wastewater with high solid contents, as it is optimized for low-solids water supply applications.

Direct-connected Self-priming Clean Water Pump delivers robust performance through a meticulously engineered technical specification suite, tailored to meet the demands of rapid self-priming and reliable clean water transfer. As a self priming pump designed for efficiency and adaptability, its technical parameters align with the core requirements of a clear water pump—ensuring compatibility with low-solids water sources, minimal maintenance, and long-term operational stability across residential, agricultural, and light industrial applications..Here is the technical specification for reference:

Model Meaning

Model	Inlet/Outlet Dia. (mm)	Flow Rate (m³/h)	Head (m)	Power (kW)	Speed (r/min)	Suction Lift (m)
25ZX(L)3.2-20	25/25	3.2	20	1.1-2	2900	5
25ZX(L)3.2-32	25/25	3.2	32	1.5-2	2900	5
32ZX(L)3.2-20	32/32	3.2	20	1.1-2	2900	5
32ZX(L)3.2-32	32/32	3.2	32	1.5-2	2900	5
32ZX(L)3.2-50	32/32	3.2	50	3-2	2900	5
40ZX(L)6.3-20	40/40	6.3	20	1.5-2	2900	5
40ZX(L)6.3-32	40/40	6.3	32	2.2-2	2900	5
40ZX(L)10-40	40/40	10	40	4-2	2900	5
40ZX(L)6.3-50	40/40	6.3	50	4-2	2900	5
50ZX(L)15-12	50/50	15	12	1.5-2	2900	5
50ZX(L)18-20	50/50	18	20	2.2-2	2900	5
50ZX(L)12.5-32	50/50	12.5	32	3-2	2900	5
50ZX(L)20-30	50/50	20	30	4-2	2900	5
50ZX(L)14-35	50/50	14	35	4-2	2900	5
50ZX(L)10-40	50/50	10	40	4-2	2900	5
50ZX(L)12.5-50	50/50	12.5	50	5.5-2	2900	5
50ZX(L)20-75	50/50	20	75	11-2	2900	5
65ZX(L)30-15	65/65	30	15	3-2	2900	5
65ZX(L)30-15	65/65	30	15	3-2	2900	5
65ZX(L)25-32	65/65	25	32	5.5-2	2900	5
65ZX(L)25-50	65/65	25	50	7.5-2	2900	5
65ZX(L)25-70	65/65	25	70	15-2	2900	5
80ZX(L)35-13	80/80	35	13	3-2	2900	5
80ZX(L)43-17	80/80	43	17	4-2	2900	5
80ZX(L)50-20	80/80	50	20	5.5-2	2900	5
80ZX(L)40-22	80/80	40	22	5.5-2	2900	5
80ZX(L)50-32	80/80	50	32	7.5-2	2900	5
80ZX(L)60-50	80/80	60	50	15-2	2900	5
80ZX(L)60-55	80/80	60	55	18.5-2	2900	5
80ZX(L)60-70	80/80	60	70	22-2	2900	5
100ZX(L)80-15	100/100	80	15	7.5-2	2900	5
100ZX(L)100-20	100/100	100	20	11-2	2900	5
100ZX(L)100-32	100/100	100	32	15-2	2900	5
100ZX(L)100-40	100/100	100	40	18.5-2	2900	5
100ZX(L)100-50	100/100	100	50	22-2	2900	5
100ZX(L)100-65	100/100	100	65	30-2	2900	5
100ZX(L)70-75	100/100	70	75	30-2	2900	5
150ZX(L)150-20	150/150	150	20	18.5-2	2900	5
150ZX(L)150-32	150/150	150	32	22-2	2900	5
150ZX(L)150-40	150/150	150	40	37-2	2900	5
150ZX(L)170-55	150/150	170	55	45-2	2900	5
150ZX(L)170-65	150/150	170	65	55-2	2900	5
150ZX(L)160-80	150/150	160	80	55-2	2900	5
150ZX(L)200-32	150/150	200	32	30-4	1450	5
150ZX(L)200-40	150/150	200	40	37-4	1450	5
200ZX(L)350-20	200/200	350	20	37-4	1450	5
200ZX(L)350-25	200/200	350	25	45-4	1450	5
200ZX(L)400-32	200/200	400	32	55-4	1450	5
200ZX(L)350-40	200/200	350	40	55-4	1450	5
200ZX(L)350-45	200/200	350	45	75-4	1450	5
200ZX(L)280-63	200/200	280	63	90-4	1450	5
250ZX(L)500-32	250/250	500	32	75-4	1450	5
250ZX(L)400-50	250/250	400	50	90-4	1450	5
300ZX(L)600-32	300/300	600	32	90-4	1450	5
300ZX(L)500-50	300/300	500	50	110-4	1450	5

Self-priming Clean Water Pump is engineered for hassle-free installation, combining the adaptability of a self priming pump with the precision of a clear water pump to simplify deployment in diverse applications. Designed for users prioritizing ease of setup, this self priming water pump eliminates complex priming procedures or specialized tools, enabling rapid commissioning in residential, agricultural, or light industrial settings.

No.	Component	Description	No.	Component	Description
1	Electric motor	directly connected with the pump to transmit power, the use of brand-name motors.	9	Drain spigot	When the pump is not used for a long time, you can open the spigot to drain the storage liquid.
2	Pump shaft	Coaxial with motor. Extended shaft for the motor ensures the concentricity of the shaft, which makes the pump run balanced and free from noise and vibration phenomenon, and adopts chrome- plated treatment to enhance the service life.	10	Bottom cover plate	When there is sediment in the pump body, you can open the bottom cover plate to remove the dirt.
3	Water retaining ring	Prevents water ingress into the motor due to seal leakage.	11	Chassis	connected to the whole pump for easy installation, vibration isolators can also be installed.
4	Mechanical seal	made of stainless steel, tungsten carbide, fluorine rubber and other materials. Balanced high-temperature and high-pressure mechanical seals, no wear and tear on the shaft, no accumulation of scale, to ensure that the working environment is neat and clean.	12	Air-liquid separation tube	When the water in the pump starts, the air is discharged through the air-liquid separation tube and the water is returned to the pump, thus completing the self-priming process.
5	Pump cover	Connects the pump body and motor.	13	Outlet pipe	connect to the outlet pipe.
6	Pump body	Pressure out chamber and suction chamber and gas-liquid separation chamber are designed by excellent hydraulic model, which is both beautiful and efficient. It is easy to install and run firmly.	14	Water filling valve	when the pump cavity is not enough liquid storage can open the valve to add water.
7	Impeller	It is designed by advanced hydraulic model, generally divided into two kinds: single runner and double runner, featuring high efficiency, good passing capacity and good reliability.	15	Check valve piece	when the pump stops working, it can prevent the water in the pipeline from flowing back.
8	Sealing ring	water pump impeller and pump body joints play a sealing role	16	Inlet pipe	connects with the inlet pipe.

1. Pump and motor are coaxial when they start in direct comnection.

2.Coupling is locked tightly by nut avoid vibration of impeller.

3 Pump inlet is higher centre line of pump shaft in order to keep rated deposit liquid to be self-priming and avoid try attrition of mechanical sea1.
4.Suction pipeline installation:
A Installation height of suction can not exceed 5 metres as possible.In allowed condition, the heigit is 1ower than lowegt deposit oil surface of oil waehouge as possible. Length of suction is shortened ad few winding unit is set as possible to shorten self-priming time and improve performance of cleaning cabin

B Leakage of suction pipeline is not permitted, such as no lealage of valve, flage in suction pipeline.

C Filter is set in suction pipeline avoid sucking solid and snndries, Efiicient flow square of filteris twice or three times of suction pipe section and often checked.

D .Pmmp can not support load of pipeline. Pipeline in suction and outlet should have their bracket.

5 Electrostatic resistance to earth in pump and pipeline reaches stated requirement when install oil pump.

6 .There are block and iron patch whether or not in pump case mnd pipeline when inustall.

7 .Adjust the installation and coaxial tolerance of coupling of pump and motor, The different axial toleranceis only allowed in 0.lmm., Conpling height tolerance of pump and motor can be adjusted by bronze cnshion or iron cushion on base plate.
8 Pump should be checked if there is ill condition after it operates for 3 -4 hours, meanwhile the temperatureof bear shonld be measured. Temperatmre of bearing, body ean not exceed 70 Celsins degree.

9.Cooled water connection is matched plastic pipe or glme pipe in-aperture 12 when cooled chamber is set in bearing body of pump. It's screw dimensionisM12 x 1.75.
10.Small vent-pipe shonld be set in outlet when one-way valve on outlet pipeline can not smoothiy drain air.

Direct-connected Self-priming Clean Water Pump offers a streamlined solution for clean water transfer, combining the efficiency of a self priming pump with the precision of a clear water pump to deliver optimized performance across diverse operating conditions. Its performance curve serves as a critical diagnostic tool, illustrating the pump’s ability to balance flow rate, head pressure, and energy consumption while maintaining rapid self-priming capabilities—a feature essential for applications requiring minimal downtime and reliable operation.

Every PUMPWISE Direct-connected Self-priming Clean Water Pump undergoes rigorous factory testing to ensure peak performance and reliability.

Reference Product Model: 80ZXL40-22

Medium: Clean Water

Rated Voltage: 380V

Inlet Diameter: 80mm

Outlet Diameter: 80mm

Rated Power: 7.5kW (4-Pole)

Water Temperature: 20.0℃

Outlet Gauge Distance: 0.20
Motor Efficiency: 90.1%

This 3D animation video provides a clear, step-by-step walkthrough of the internal components and assembly process of our Direct-connected Self-priming Clean Water Pump. From the heavy-duty motor base and mechanical seal to the precision impeller and pump casing, this showcase highlights the high-quality craftsmanship, solid construction, and reliable engineering designed to ensure optimal fluid performance and easy maintenance.

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