ZX Series Self-Priming Centrifugal Pump
A single-stage, single-suction self-priming centrifugal pump covering 3.2-550 m³/h at heads of 12-80 m, with a suction lift of 5-6.5 m and no bottom valve required.
The ZX series is a single-stage, single-suction, cantilever self-priming centrifugal pump that draws liquid without a bottom valve on the suction line. Published coverage is 3.2-550 m³/h at heads of 20-80 m with a suction lift of 5-6.5 m, and it is offered for clear water, sewage, seawater, light oil and acid or alkali chemical liquids. Self-priming is achieved by the pump's own hydraulic design, so the suction pipework stays simple and the pump can re-prime itself without being opened up. Because there is no backstop valve, the hydraulic passage is unobstructed, which keeps efficiency high and maintenance straightforward. Media guidance from the supplier limits service to liquids of medium viscosity up to 100 PCT with a solids content not exceeding 30%.
| Parameter | Specification |
| Flow rate | 3.2-550 m³/h |
| Head | 12-80 m across the published models |
| Suction lift | 5-6.5 m |
| Pump type | Single-stage, single-suction, cantilever self-priming |
| Speed | 2900 r/min (published models) |
| Motor power | 0.75-110 kW across the published models |
| Shaft power | Published per model alongside motor power |
| Media | Clear water, seawater, light oil, acid and alkali chemical liquids, general slurry |
| Medium limits | Viscosity up to 100 PCT; solids content up to 30% |
Each row is one published ZX model with its rated flow, head, suction lift, speed, shaft power and motor power. The series runs to 300ZX550-22 at the top of the range.
| Model | Flow (m³/h) | Head (m) | Suction (m) | Shaft power (kW) | Motor power (kW) | Speed (r/min) |
| 25ZX3.2-20 | 3.2 | 20 | 6.5 | 0.46 | 0.75 | 2900 |
| 25ZX3.2-32 | 3.2 | 32 | 6.5 | 0.8 | 1.1 | 2900 |
| 40ZX6.3-20 | 6.3 | 20 | 6.5 | 0.87 | 1.1 | 2900 |
| 40ZX10-40 | 10 | 40 | 6.5 | 2.7 | 4 | 2900 |
| 50ZX15-12 | 15 | 12 | 6.5 | 1.1 | 1.5 | 2900 |
| 50ZX18-20 | 18 | 20 | 6.5 | 1.8 | 2.2 | 2900 |
| 50ZX12.5-32 | 12.5 | 32 | 6.5 | 2.1 | 3 | 2900 |
| 50ZX20-30 | 20 | 30 | 6.5 | 2.6 | 4 | 2900 |
| 50ZX12.5-50 | 12.5 | 50 | 6.5 | 4.3 | 5.5 | 2900 |
| 50ZX15-60 | 15 | 60 | 6.5 | 6.2 | 7.5 | 2900 |
| 50ZX20-75 | 20 | 75 | 6.5 | 9.8 | 11 | 2900 |
| 65ZX30-15 | 30 | 15 | 6.5 | 1.9 | 3 | 2900 |
| 65ZX25-32 | 25 | 32 | 6 | 4.4 | 5.5 | 2900 |
| 80ZX35-13 | 35 | 13 | 6 | 1.9 | 3 | 2900 |
| 80ZX50-25 | 50 | 25 | 6 | 5.2 | 7.5 | 2900 |
| 80ZX60-70 | 60 | 70 | 6 | 20.1 | 22 | 2900 |
| 100ZX100-20 | 100 | 20 | 6 | 7.8 | 11 | 2900 |
| 100ZX100-40 | 100 | 40 | 6 | 16.3 | 22 | 2900 |
| 100ZX70-75 | 70 | 75 | 6 | 24.2 | 30 | 2900 |
| 150ZX170-65 | 170 | 65 | 5 | 46.3 | 55 | 2900 |
| 150ZX160-80 | 160 | 80 | 5 | 53.6 | 55 | 2900 |
| 200ZX200-32 | 200 | 32 | 5 | 52.1 | 55 | 1450 |
| 200ZX350-65 | 350 | 65 | 5 | 97.2 | 110 | 1450 |
| 250ZX400-32 | 400 | 32 | 5 | 72.3 | 75 | 1450 |
| 250ZX450-55 | 450 | 55 | 5 | 102.1 | 110 | 1450 |
| Item | Detail |
| Construction | Pump body, impeller, seal, bearings and coupling in a cantilever arrangement |
| Shaft seal | Mechanical seal on the shaft; state the medium so the correct faces are fitted |
| Valving | No backstop valve - the pump self-primes without a bottom valve in the suction line |
| Drive | Coupled to an electric motor on a common baseplate |
| Slurry duty | Acceptable where viscosity is within 100 PCT and solids content does not exceed 30% |
| Accessories | Rocker-type nozzle available so the pump can spray water over a wide area |
- Chemical and pharmaceutical plants: Transfers clear or slightly contaminated chemical process liquids.
- Petroleum and dyestuff works: Handles light oils, dyestuffs and printing and dyeing liquors.
- Construction and mining: Dewaters sumps and pits where the suction has to lift liquid.
- Oil tanker drainage: Empties compartments and bilges where suction lift is required.
- Filter press feeding: Pressurises slurry feed into filter presses of any size.
- Irrigation and spraying: Supplies farms, nurseries, orchards and tea gardens, with a spray nozzle option.
- Confirm the suction lift first - the published 5-6.5 m determines whether the pump can prime from your sump or tank.
- Check the solids content and particle size against the stated 30% limit, and the viscosity against 100 PCT.
- Match the pump body, impeller and seal materials to the chemical being handled; self-priming does not make a pump chemically resistant on its own.
- Compare shaft power with motor power for your duty, since the two are published separately for every model.
- Remember that no bottom valve is required, but a strainer on the suction line is still advised.
What suction lift can a ZX self-priming pump achieve?
The published models self-prime from 5-6.5 m of suction lift. Keep the actual lift below that figure and keep the suction line short and airtight for reliable priming.
Does the ZX pump need a foot valve?
No - the series is designed without a backstop valve, so no bottom valve is needed in the suction line. This simplifies the piping and improves working conditions.
Can the ZX series handle slurry or chemical liquids?
Yes, within limits. The supplier states suitability for acid and alkali chemical liquids and general slurry with viscosity up to 100 PCT and solids content up to 30%; check materials and seal selection against your medium.
What media can the ZX self-priming pump handle?
Clear water, seawater, light oil, acid and alkali chemical liquids and general slurry, within the published limits of 100 PCT viscosity and 30% solids content.
What flow and head does the ZX series cover?
The range runs from 3.2 m³/h at 20 m to 550 m³/h at 22 m, with heads from 12 m to 80 m across the model list.
Why is no bottom valve needed on a ZX pump?
The pump primes itself through its own hydraulic design and has no backstop valve, so the suction line can be kept simple and does not need a foot valve.
How much suction lift can the ZX pump manage?
The published models work at 5-6.5 m of suction lift, which covers most sump, tank and tanker drainage duties.
What should I send for a ZX pump quotation?
Flow, head, suction lift, liquid name and concentration, solids content and particle size, viscosity, voltage and frequency.
Related Products
- IS Series End-Suction Centrifugal Pump
- ZW Series Self-Priming Wastewater Pump
- CYZ Series Self-Priming Fuel & Oil Pump
How to Choose the Right ZX Series Self-Priming Centrifugal Pump
Quick answer: The ZX Series Self-Priming Centrifugal Pump covers flow 3.2-550 m³/h, heads of 12-80 m. Selection starts from the duty point - flow, head, liquid properties and available NPSH - rather than from the catalogue maxima.
Industry Applications
Explore how this equipment can be applied in related industrial sectors and review application-specific selection guidance.