DN25-DN300 Stainless Steel Direct-connected Self-priming Sewage Pump

Model NO. PWSZWLP

Flow Range：3.2-1200m³/h
Head Range：10-75m
Self - Priming Lift：5m
Motor Power：1.1-110kW
Inlet/Outlet Range：DN25-DN300
Sealing Method: Mechanical seal single-end (double-end, containerized, customizable)

Quantity

PWS Stainless Steel Direct-connected Self-priming Sewage Pump

Designed for demanding sewage pumping applications with solids-laden or viscous media, this self priming transfer pump integrates a 316/304 stainless steel construction and direct-coupled design to ensure corrosion resistance and durability. Equipped with intelligent self priming water pumps technology, it achieves rapid priming and clog-free operation, ideal for municipal, industrial, or construction scenarios requiring efficient fluid transfer. The streamlined structure enhances energy efficiency while maintaining stable performance in complex media handling, offering a low-maintenance solution for high-challenge sewage pumping environments. Developed by PWS, it prioritizes operational reliability and long-term cost savings.

Core Advantages

Direct connection design

The motor and pump body are directly connected through the flange, eliminating the need for couplings and independent bearing seats, resulting in a compact overall structure and 30% higher operational stability.

Efficient self-priming

No need to install a bottom valve, after the first injection of liquid to achieve a self-priming height of 5 meters, especially for pipeline containing gas or need to start and stop frequently.

Reliable sealing

Standard single-end mechanical seal, for high temperature (≤ 120 ℃), corrosive media (such as acidic wastewater, salt-containing sludge), can be customized double-end seals, containerized seals and other enhancement programs, leakage risk is reduced by 90%.

Technical Highlights

Multi-material selection

Self priming transfer pump body provides 304 stainless steel, cast iron and other materials, taking into account the corrosion resistance and economy, the user can be freely selected according to the characteristics of the medium.

Low Shear Conveying

Single-screw structure design ensures smooth fluid transportation and reduces damage to the physical properties of the medium (such as emulsion stability).

Ease of Maintenance

Modular stator and rotor assemblies support quick replacement, reducing downtime and maintenance costs.

Self-priming Sewage Pump VS Self-priming clean water Pump

Comparison Feature	Self-primingSewage Pump	Self-priming Clean Water Pump
Applicable Medium	Sewage, wastewater, and fluids containing solid particles, fibers, or suspended solids.	Clean water or liquids with physical and chemical properties similar to clean water (free of impurities).
Impeller Structure	Typically uses semi-open, open, or vortex impellers with wide channels to prevent clogging.	Usually uses closed impellers designed for higher hydraulic efficiency and head pressure.
Solid-Handling Capacity	High capacity to pass solid particles and fibers without easily clogging or jamming.	Narrow flow channels that are highly sensitive to impurities, which can cause blockages or wear.
Design & Maintenance	Features a larger casing and often includes a clean-out port or wear-resistant mechanical seals for easy debris removal.	Compact design without specialized clean-out ports, optimized strictly for clean fluid handling.

Q1: What materials are used for this pump, and what kind of liquids can it handle?

A: The pump is constructed from high-grade stainless steel, making it exceptionally corrosion-resistant. It is designed for handling sewage, wastewater, and industrial liquids containing solid particles, fibers, or chemical properties, thanks to its robust self-priming sewage structure.

Q2 : What does"direct-connected"mean for this pump design?

A:"Direct-connected"means the pump impeller is directly mounted or coupled to the motor shaft. This design offers a more compact structure, reduces alignment issues during installation, minimizes mechanical transmission loss, and ensures higher operational efficiency and easier maintenance compared to traditional split-type designs.

Q3: What is the maximum self-priming lift of this pump?

A: The standard self-priming lift for this series is up to 5 meters, allowing it to effectively draw liquid from a lower source without requiring an external priming foot valve initially (once properly primed for the first run)

In complex working conditions such as sewage treatment, municipal drainage, and industrial wastewater transportation, self priming transfer pumps and self priming water pumps have become key equipment due to their ability to automatically start and maintain suction capacity without the need for pumping. As an innovative product in this field, the Stainless Steel Direct connected Self priming Sewage Pump combines self-priming function with sewage discharge capacity through integrated design, using stainless steel material to enhance corrosion resistance. Its technical specifications cover core parameters such as flow range, head, self-priming height, motor power and speed, while relying on a direct transmission structure to reduce energy consumption and maintenance costs, ensuring efficient and stable operation when transporting sewage containing solid particles, fibers and corrosive media. It has become an ideal choice for urban pipe networks, industrial wastewater stations and emergency drainage scenarios.

Model meaning

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Model	Inlet/Outlet Dia. (mm)	Flow Rate (m³/h)	Head (m)	Power (kW)	Speed (r/min)	Suction Lift (m)
25ZW(L)8-15	25/25	8	15	1.5-2	2900	5
32ZW(L)10-20	32/25	10	20	2.2-2	2900	5
32ZW(L)9-30	32/25	9	30	3-2	2900	5
40ZW(L)20-15	40/32	20	15	2.2-2	2900	5
40ZW(L)10-20	40/32	10	20	2.2-2	2900	5
40ZW(L)15-30	40/32	15	30	3-2	2900	5
50ZW(L)10-20	50/40	10	20	2.2-2	2900	5
50ZW(L)20-15	50/40	20	15	2.2-2	2900	5
50ZW(L)18-22	50/40	18	22	3-2	2900	5
50ZW(L)15-30	50/40	15	30	3-2	2900	5
50ZW(L)20-35	50/40	20	35	5.5-2	2900	5
50ZW(L)20-40	50/40	20	40	7.5-2	2900	5
50ZW(L)20-50	50/40	20	50	11-2	2900	5
65ZW(L)30-18	65/65	30	18	4-2	2900	5
65ZW(L)30-18D	65/65	30	18	4-4	1450	5
65ZW(L)25-30	65/65	25	30	5.5-2	2900	5
65ZW(L)25-40	65/65	25	40	7.5-2	2900	5
65ZW(L)25-50	65/65	25	50	11-2	2900	5
65ZW(L)40-25	65/65	40	25	7.5-2	2900	5
65ZW(L)65-25	65/65	65	25	7.5-2	2900	5
80ZW(L)40-16	80/65	40	16	4-2	2900	5
80ZW(L)40-16D	80/65	40	16	4-4	1450	5
80ZW(L)50-15	80/65	50	15	5.5-2	2900	5
80ZW(L)65-25	80/65	65	25	7.5-2	2900	5
80ZW(L)50-30	80/65	50	30	11-2	2900	5
80ZW(L)80-35	80/65	80	35	15-2	2900	5
80ZW(L)40-50	80/65	40	50	18.5-2	2900	5
80ZW(L)50-60	80/65	50	60	22-2	2900	5
100ZW(L)80-20	100/80	80	20	7.5-4	1450	5
100ZW(L)100-15	100/80	100	15	7.5-4	1450	5
100ZW(L)100-20	100/80	100	20	11-4	1450	5
100ZW(L)100-30	100/80	100	30	22-2	2900	5
100ZW(L)80-45	100/80	80	45	30-2	2900	5
100ZW(L)80-60	100/80	80	60	37-2	2900	5
100ZW(L)80-80	100/80	80	80	45-2	2900	5
125ZW(L)120-20	125/125	120	20	15-4	1450	5
150ZW(L)180-14	150/125	180	14	15-4	1450	5
150ZW(L)150-20	150/125	150	20	15-4	1450	5
150ZW(L)180-20	150/125	180	20	18.5-4	1450	5
150ZW(L)180-30	150/125	180	30	30-4	1450	5
150ZW(L)180-35	150/125	180	35	37-4	1450	5
150ZW(L)180-38	150/125	180	38	45-4	1450	5
150ZW(L)180-45	150/125	180	45	55-4	1450	5
200ZW(L)280-14	200/150	280	14	22-4	1450	5
200ZW(L)280-20	200/150	280	20	37-4	1450	5
200ZW(L)280-25	200/150	280	25	45-4	1450	5
200ZW(L)280-28	200/150	280	28	55-4	1450	5
250ZW(L)420-14	250/200	420	14	45-4	1450	5
250ZW(L)420-20	250/200	420	20	55-4	1450	5
300ZW(L)800-14	300/250	800	14	55-4	1450	5
300ZW(L)800-20	300/250	800	20	75-4	1450	5

Complete Performance Curves & Dimensions Table: For full technical specifications, detailed performance curves, and precise dimensional drawings of all models, please download the complete product manual.

In scenarios such as sewage treatment, municipal drainage, and industrial wastewater transportation, self priming transfer pumps have become the core equipment for dealing with complex working conditions due to their advantage of quickly starting and maintaining continuous suction without the need for manual pumping. The Stainless Steel Direct connected Self priming Sewage Pump, as an innovative solution in this field, significantly improves installation convenience and operational reliability by optimizing the pump body structure and materials (such as stainless steel corrosion-resistant pump casing, anti clogging impeller) and direct connection motor design. However, the installation process must strictly follow technical specifications, including key links such as foundation fixation, pipeline connection, electrical wiring, and self-priming performance debugging. Any operational error may lead to a decrease in self-priming efficiency or damage to the pump body.

Installation instructions

1. The weight of the pipeline should not be added to the pump during installation, and there should be their respective supporting bodies, so as not to deform the pump and affect the operating performance and life.

2. The pump and the motor are of integral structure, it is very convenient to install them without the need to find the right one.

3. The ground bolts must be tightened during installation to avoid the effect of vibration on the performance of the pump during starting.

4. Before installing the pump, the pump flow channel should be carefully checked for hard materials (such as stones, iron particles, etc.) that may affect the operation of the pump, so as to avoid damaging the impeller and the pump body when the pump is running.

5. For the convenience of maintenance and safety, install a regulating valve on each of the import and export pipelines of the pump and a pressure gauge near the outlet of the pump to ensure that the pump operates within the rated head and flow rate to ensure the normal operation of the pump and increase the service life of the pump.

6. pump for suction occasions, should be equipped with a bottom valve, and the inlet pipeline should not have too many bends, while there shall be no water leakage, air leakage.

7. Discharge piping such as backstop valve should be installed outside the gate valve.

8. After installation, the impeller should have no friction sound or jamming phenomenon when the pump shaft is moved, otherwise, the pump should be disassembled to check the reason.

9. The installation of the pump is divided into hard coupling and flexible coupling installation.

PWS Stainless Steel Direct connected Self priming Sewage Pump performs excellently in sewage pumping scenarios. The performance curve chart intuitively presents the laws of changes in parameters such as flow rate, head, power, and efficiency with working conditions. By analyzing the curve, the optimal working range, high-efficiency operating range, and adaptability to medium characteristics of the pump can be clarified, providing a scientific selection basis for urban drainage, industrial wastewater treatment, and emergency drainage scenarios, ensuring that the equipment achieves efficient and stable sewage transportation under complex working conditions.

Reference Product Model: 80ZWLP80-35

Medium: Clean water

Rated Voltage: 380V

Inlet Diameter: 80mm

Outlet Diameter: 80mm

Rated Power: 15kW

Water Temperature: 20.0 C

Outlet Gauge Distance: 1.00

Motor Efficiency: 93.3%

In scenarios such as sewage treatment, municipal drainage, and industrial wastewater treatment, self priming transfer pumps and self priming water pumps have become key equipment for dealing with complex working conditions due to their ability to automatically remove air and restore suction without the need for pumping. As an innovative product in this field, the Stainless Steel Direct connected Self priming Sewage Pump combines self-priming function with sewage discharge capacity through integrated design. Its core components, such as stainless steel impeller, anti clogging flow channel, dual mechanical seal, gas-liquid separation chamber, and direct motor, work together to efficiently treat sewage containing solid particles, fibers, and corrosive media, while relying on a direct transmission structure to reduce energy consumption and maintenance costs.

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