The HZX Standard is the baseline self priming sewage pump in the HZX series from Anhui Hongjiu Water Pump Equipment Co., Ltd. Its built-in air-water separation chamber re-primes on every start without operator involvement — making it the practical choice for unmanned pump stations, remote irrigation sites, and any installation where a conventional submersible or foot-valve pump would require confined-space access.
Technical Specifications
| Parameter | Value |
|---|---|
| Pump Type | Single-stage centrifugal, self-priming |
| Self-Priming Height | ≤ 5 m (model-dependent) |
| Flow Range | 5 – 200 m³/h |
| Head Range | 5 – 35 m |
| Medium Temperature | +4 °C to +60 °C |
| Max Solid Content | < 2% by volume |
| Solid Particle Size | ≤ 20 mm (semi-open impeller) |
| pH Range | 6.5 – 8.5 |
| Working Pressure | ≤ 1.0 MPa |
| Motor Protection | IPX4 (splash-proof, above-ground) |
| Motor Winding | 100% copper |
| Pump Casing | Cast Iron HT200 |
| Shaft | Stainless Steel 420 |
| Bearing | Single-row radial ball bearing |
| Mechanical Seal | Silicon carbide / carbon (SiC) |
| Power Supply | 380 V / 50 Hz (3-phase), 220 V / 50 Hz (single-phase, small sizes) |
How Self-Priming Works — No Foot Valve Required
Conventional end-suction pumps require a foot valve to retain the prime in the suction pipe. When that foot valve clogs, corrodes, or leaks — which is routine in sewage service — the pump loses prime and stops delivering flow. Restoring service means sending personnel into the wet pit.
The HZX eliminates this failure mode through an integrated priming chamber:
- First start — The casing is filled with clean water once during initial commissioning.
- Every subsequent start — The impeller rotates, drawing residual liquid from the priming chamber and mixing it with suction-side air. The air-water mixture is discharged, air separates in the priming chamber, and the suction side fills with liquid automatically.
- Full prime achieved in 60–180 seconds — depending on suction lift and total pipe volume.
The result is an above-ground pump that behaves like a submersible — self-starting, self-priming, and requiring no wet-pit access for day-to-day operation.
Key Advantages vs. Conventional Sewage Pump Installations
| Feature | HZX Standard | Submersible Pump | End-Suction + Foot Valve |
|---|---|---|---|
| Foot valve required | No | No | Yes — clogs and corrodes |
| Priming on restart | Automatic | N/A — always submerged | Manual re-filling required |
| Maintenance location | Above ground | Wet-pit entry required | Wet-pit entry required |
| Impeller type | Semi-open / vortex | Varies | Standard closed — clogs |
| Motor cooling | Air-cooled, IP rated | Water-cooled (ambient dependent) | Air-cooled |
| Installation cost | Low — no pit excavation | High — wet pit required | Medium |
Applications
Municipal sewage lift stations — Automatic re-priming allows unattended overnight operation. No foot valve reduces maintenance callouts.
Agricultural field drainage and irrigation — Remote sites without permanent operators benefit from the automatic start-up. The pump handles runoff with debris, algae, and suspended solids.
Aquaculture pond water management — Suitable for pond water with organic matter and fine particulates within the 2% solid content limit.
Construction and mining site dewatering — Temporary above-ground installation with fast deployment. No excavation required for a sump or wet pit.
Industrial effluent — paper, textile, food processing — Handles fibrous materials, fine cellulose, and non-corrosive process wastewater within pH 6.5–8.5.
Storm water and flood drainage — Fast re-priming after power interruptions restores service without manual intervention.
Media Compatibility
Suitable:
- Raw municipal sewage and grey water
- Storm water with suspended debris
- Agricultural runoff and field drainage
- Aquaculture and pond water
- Non-corrosive industrial wastewater
- Fibrous media: paper pulp, textile lint, food processing effluent
Not suitable:
- Corrosive or strongly acidic/alkaline media (outside pH 6.5–8.5)
- Explosive or flammable liquids
- High-abrasive slurry exceeding 2% solid content by volume
- Media containing large hard solids exceeding impeller clearance
Materials & Construction Details
Cast Iron HT200 pump casing — Gray cast iron with high graphite flake content gives good machinability and damping properties. Standard for above-ground sewage pump service where impact loads are moderate.
420 Stainless Steel shaft — Martensitic stainless steel provides corrosion resistance against the mildly aggressive media found in municipal and agricultural sewage, combined with good mechanical strength.
Silicon carbide (SiC) mechanical seal — SiC face material resists abrasive particles better than standard carbon/ceramic seals. Appropriate for service containing fine suspended solids up to the 2% volume limit.
100% copper motor windings — Full copper wound stators deliver rated performance across the full duty cycle. Aluminum substitute windings lose efficiency and generate excess heat during continuous operation.
Single-row radial ball bearings — Selected for the load characteristics of above-ground centrifugal pump service. Grease-lubricated, sealed for maintenance-free operation within rated speed and temperature parameters.
Frequently Asked Questions
Does the HZX truly eliminate the foot valve?
Yes. The built-in priming chamber stores enough liquid to re-prime the pump on every start without a foot valve. Initial commissioning requires one manual filling of the casing — after that, the pump is self-priming indefinitely.
How long does priming take after a power interruption?
Typically 60–180 seconds, depending on suction lift height and total volume of the suction pipe. The process is fully automatic — no operator input is required.
Can the HZX run continuously 24/7?
Yes, within the rated medium temperature range of +4 °C to +60 °C. The 100% copper motor windings and quality radial ball bearings are designed for continuous-duty operation. Ensure adequate ventilation around the motor.
What happens if solids exceed the 2% limit?
Solids above 2% by volume risk accelerated wear on the semi-open impeller and mechanical seal faces. For higher solid concentrations, contact Hongjiu for a slurry pump recommendation. Occasional exceedances will not cause immediate failure, but sustained overloading shortens seal life.
Is single-phase power available?
Yes, for smaller frame sizes (typically below 2.2 kW). Confirm available supply voltage when requesting a quotation — three-phase 380 V is standard for all other sizes.
Related Products
- HZX Self-Priming Sewage Pump Series Overview — Series hub with full comparison table
- HNG Standard Horizontal End-Suction Pump — For clean water large-flow duties
- HDG Standard Vertical Inline Pump — For HVAC and building water supply
