ZWL direct coupled self priming sewage pump with electric motor

ZWL Direct-Coupled Self-Priming Sewage Pumps

Model NO. ZWL Direct-Coupled Self-Priming Sewage Pumps

Pump material：Cast Iron，Stainless Steel

Inlet & Outlet Size：DN25-DN300

Flow Range: 8 - 800 m³/h

Head Range: 14 - 80 m

Motor Power: 1.5 - 75 kW

Self-Priming Lift : 5 m

Speed : 1450 r/min / 2900 r/min

Voltage: 220V / 380V / 415V / 440V

What is ZWL Direct-Coupled Self-Priming Sewage Pumps？

What is ZWL Direct-Coupled Self-Priming Sewage Pumps?

The ZWL series pump combines self-priming capability and non-clogging performance in one compact unit. Engineered as a highly efficient sewer pump and heavy-duty effluent pump, it features an axial return outer-mixture system and a unique impeller channel. Before starting, this industrial sewage pump requires no foot valve or manual priming water. As a multi-purpose effluent pump, it easily handles wastewater containing large solid particles, long fiber impurities, and sludge.

Key Features:

Easy to Use: Excellent self-priming functionality as an automated sewer pump, eliminating the need for priming water or foot valves.
Non-Clog Design: As a reliable sewage pump, it smoothly pumps fluids with suspended solids, debris, and tough fibrous materials.
Simple & Durable: Simple direct-coupled structure makes this effluent pump highly energy-efficient and low-maintenance.
Cost-Effective: Exceptional hydraulic performance as a heavy-duty sewer pump at competitive factory pricing.

Wide Applications: This versatile sewage pump is widely used in municipal sewage systems, wastewater treatment, pond farming, paper making, textiles, food processing, chemical processing, power plants, and fiber pulp management.

Model Meaning

Self-Priming Sewage Pump ZW Series Model Designation and Nomenclature Chart | JPZX

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)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

Q1: What is the difference between ZWL (Direct-Coupled) and ZW (Frame-Mounted/Coupling)?

A: Both share the exact same hydraulic performance and flow/head parameters, but their physical structure is different:

ZWL (Direct-Coupled): The pump impeller is directly mounted on the motor shaft. It is more compact, space-saving, lower in weight, highly aligned (no shaft misalignment issues), and more budget-friendly. Ideal for skid packages, equipment integration, or tight installation spaces.

ZW (Baseplate Mounted): The pump and motor are separate units connected via a flexible coupling on a shared baseplate. It is easier to maintain or replace the motor independently, making it suitable for high-power, heavy-duty continuous industrial operations.

Q2: What is the maximum solid size and fiber length the ZWL pump can handle?

A: The Zw series comes in three designs: semi-open impeller design, fully open impeller design, and enclosed impeller design.

Solid Particles: Can pass spherical solids up to 50% of the pump's discharge diameter Long Fibers: Can handle fibrous impurities up to 150% of the discharge diameter without wrapping around the shaft.

Q3: Can the ZWL pump handle fuels, oils, or corrosive chemicals?

A: Yes, but not recommended. Standard ZWL pumps are designed for sewage. For oil transfer, NBR seals and an explosion-proof motor can be customized.

For Corrosive Chemicals: Standard Cast Iron will corrode. Choose Stainless Steel 304/316 (ZWL-P) or Duplex Steel for acid/alkali resistance.

Q4: How deep can the ZWL pump suck liquid, and is a foot valve required?

A: The vertical suction lift is 5 meters. No foot valve is required at the suction inlet. Pour priming water into the pump casing only once during initial startup; it self-primes automatically afterwards.

Q5: What are the main applications for the ZWL pump?

A: ZWL is widely used in applications needing non-clogging performance in compact spaces:

OEM Equipment Integration: Compact mobile trailers, sewage treatment skids, and generator pump packages.

Municipal & Industrial: Factory wastewater pits, municipal rainwater drainage, livestock farm manure transfer, and paper pulp processing.

Q6: How do I read the ZWL model code to check my specifications?

A: Model syntax: ZWL [Inlet Size] - [Flow m³/h ] - [Head Meters] [Material/Motor Code].

Example: ZWL50-15-30 PB means:

ZWL: Direct-Coupled Self-Priming Sewage Pump

50: 50mm (2-inch) Inlet/Outlet

15 / 30: 15m³/h Flow Rate / 30 Meters Total Head

P / B: P = Stainless Steel casing; B = Explosion-Proof Motor.

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