The HZS single stage centrifugal pump delivers reliable, corrosion-resistant performance for HVAC secondary loops, domestic water supply, and light industrial process water. Built with all AISI 304 stainless steel wetted parts and an extended shaft design that eliminates the need for a coupling, the HZS series reduces maintenance complexity while maintaining IE3 energy efficiency as standard.
Extended Shaft Design — Fewer Parts, Less Vibration
At the core of the HZS design is an extended shaft that connects the impeller directly to the motor without an intermediate coupling. This engineering choice delivers four practical advantages:
- No alignment required — The pump shaft and motor shaft share a common bearing system, so there is no coupling to misalign over time. Installation is simpler and faster.
- Fewer wearing parts — Removing the coupling, coupling guard, and separate pump bracket reduces the component count and eliminates a common failure point.
- Less vibration — Without coupling backlash, transmitted vibration drops significantly, extending bearing and seal life.
- Compact footprint — The combined pump-motor unit occupies less floor space than conventional coupled arrangements, which matters in crowded mechanical rooms.
Technical Specifications
| Parameter | Value |
|---|---|
| Pump type | Horizontal, single stage, end-suction centrifugal |
| Flow range | 2–120 m³/h |
| Head range | 5–50 m |
| Inlet/outlet sizes | DN32–DN100 |
| Wetted parts material | AISI 304 stainless steel (impeller, pump body, shaft sleeve, seal housing) |
| Motor efficiency class | IE3 standard (IE4 / IE5 optional) |
| Speed | 2-pole / 4-pole, 1450 / 2900 rpm |
| Mechanical seal | SiC / graphite / EPDM (other materials available on request) |
| Maximum working pressure | 1.6 MPa (16 bar) |
| Medium temperature range | -10 °C to +80 °C (higher on request) |
| Installation orientation | Horizontal |
Applications
HVAC secondary loops — The 304 SS construction resists glycol-laden condenser water and chilled-water corrosion inhibitors, making the HZS a reliable choice for air-handling unit and fan-coil distribution.
Domestic and community water supply — With low-noise operation and compliance with potable-water material requirements, the HZS is widely installed in apartment blocks and residential community boosting stations.
Light industrial process water — Plating rinse, mild chemical transfer, and general process-water recirculation benefit from the all-stainless hydraulic path.
Tank filling and cooling-tower makeup — The flat curve characteristic and broad flow range allow a single model family to cover multiple duty points in a cooling-tower circuit.
Mechanical Seal Options
The standard SiC / graphite / EPDM seal suits clean water at temperatures up to 80 °C. For more demanding duties, Hongjiu offers alternative seal face materials and elastomers on request. Contact the engineering team for glycol, mild acid, or elevated-temperature service.
Related Products
- HZS VFD Variable Frequency Centrifugal Pump
- HZS Stainless Steel Centrifugal Pump — full series overview
Frequently Asked Questions
Is 316 stainless steel available for the wetted parts?
Yes. While AISI 304 is the standard material, Hongjiu can supply all-wetted-parts in AISI 316 (or 316L) for applications involving chlorides, saltwater exposure, or mildly corrosive process fluids. Specify the requirement at order time.
What is the maximum allowable medium temperature?
The standard HZS is rated for media between -10 °C and +80 °C. For temperatures up to 120 °C, Hongjiu can fit high-temperature mechanical seals and a reinforced casing design.
What seal options are available beyond the standard SiC/graphite/EPDM?
Alternatives include tungsten carbide faces for abrasive slurries, Viton or FKM elastomers for chemical resistance, and double mechanical seals for applications requiring zero-leakage performance.
