Davey's Horizontal Multistage Water Pump With Torrium2 - HM90-11T
Key features:
- Standard automatic pressure system type.
- Suitable for larger households (5-7 shower heads with 8-10 pipes).
- For household, garden, farming, and agricultural use.
- 24 months warranty for pump, motor & controller.
(24 + 6 additional months with e-Warranty scheme) - Fixed pressure setting on every usage.
- Easy installation, no setting required.
Classified As:
Overview of Davey's Horizontal Multistage Water Pump With Torrium2
The HM90-11T of Horizontal Multistage water pump introduced by Davey is designed to provide strong pressure for multi-storey buildings (up to 3 storey buildings) and households with high water demand. Its performance comes from a series of built-in stainless steel impellers arranged in multiple stages, which increase water pressure and flow. This ensures that shop lots, larger homes, and other properties with heavy water usage receive the required water supply. The name Horizontal Multistage refers to the pump’s design, where multiple impellers are arranged horizontally within the unit.
Davey’s Horizontal Multistage range of centrifugal pumps, often abbreviated as the HM series, is a common term used by Davey’s authorised dealers and users worldwide. The pumps are equipped with high-quality hydraulic components to ensure efficient handling of pressurised fluids, while an alloy composite housing provides strong resistance to corrosion. As a general guide, the lower-end models from Davey Water Products are intended for residential water supply and garden irrigation, while the mid- to high-range models are designed for farming and commercial applications.
HM90-11T Method of Identification
Davey Water Products uses a standardised product code system worldwide, ensuring consistent identification across all markets. The electropump’s model code is typically made up of:
- A shortened series name.
- The flow rate measurement.
- The power output in kilowatts (kW).
- The voltage phase configuration.
For the Horizontal Multistage water pump, an example model code is HM90-11. The code begins with the series abbreviation, HM, which stands for Horizontal Multistage. The number 90 indicates the pump’s flow rate of 90 litres per minute, while 11 represents a 1.05 kW power output. The final alphabet, T, represents that this water pump has got a Torrium2 pressure controller attached.
Internally, this product code primarily serves as an identification and tracking reference within Davey’s warehouse operations. It helps staff accurately locate and retrieve the correct water pump for order fulfilment, while ensuring inventory is organised consistently for efficient management. The same coding system is also used across warehouse shelving and storage locations, allowing products to be professionally sorted and easily identified throughout Davey’s extensive industrial inventory network.
Attachment
Torrium2
The Torrium2 can be an important component fitted to Davey’s HM90-11T centrifugal pump. It is an electronic smart controller designed to regulate water flow and maintain consistent pressure in residential properties and commercial offices. Achieved by automatically starting the pump when a pressure drop is detected, it stops when the flow rate falls below approximately 1 litre per minute (LPM).
One of the key benefits of the Torrium2 is that it reduces unnecessary pump cycling by controlling when the Horizontal Multistage electropump starts and stops. Its built-in control system allows for a gradual start-up and shutdown process, helping to minimise water hammer, a hydraulic shock that can occur from sudden changes in water flow and potentially cause damage to pipes, fittings, and system components.
Strong Starting Pressure: A key feature of the Torrium2 is its intelligent pressure sensor, which detects water demand and automatically starts the pump when system pressure falls to approximately 80% of the peak pressure. The peak pressure is automatically recorded each time the booster pump stops, allowing the controller to adapt to the performance characteristics of the connected pump.
Adaptive Start Function: Water leaks can often cause unwanted pump cycling, and the Torrium2 is designed to distinguish between genuine water usage and minor leakage, such as small drips from a tap. When an extremely low flow rate is detected, the controller automatically reduces its start pressure threshold to 50% of the last recorded pressure, helping to prevent unnecessary pump operation. Once water demand exceeds 0.5 litres per minute (LPM), the Torrium2 returns to its normal operating mode and starts the Horizontal Multistage pump as required.
Dry-Running Protection: The HM90-11T water pumps are designed to operate with a continuous supply of water. If the Torrium2 detects a loss of prime in Davey’s Horizontal Multistage centrifugal pump, it activates a built-in dry-running protection function and immediately shuts down the pump to prevent damage.
To minimise downtime, the controller automatically attempts to restart the pump after 5 minutes and 30 minutes, followed by intervals of 1, 2, 4, 8, 16, and 32 hours. Once a sufficient water supply and normal pressure are restored, the controller will automatically restart the pump and resume normal operation.
Mechanical Pressure Switch
Davey’s Horizontal Multistage pump can be fitted with a mechanical pressure switch, which controls pump operation based on pre-set pressure levels within the water system.
Trigger And Shutdown Function: The pressure switch automatically starts or stops the Horizontal Multistage electropump when system pressure falls below or rises above the configured pressure settings. This ensures that the required water pressure is maintained throughout the system.
Adjustable Pressure Settings: The cut-in and cut-out pressure points can be adjusted by the user to suit the requirements of the water system. Correct adjustment helps maintain stable pressure, reduces stress on the Horizontal Multistage water pump, and promotes efficient operation. It also helps minimise unnecessary pressure surges and pressure drops that may contribute to wear on pipes, fittings, and other plumbing components.
Resource And Energy Conservation: Using the HM90-11T Horizontal Multistage water pump equipped with a mechanical pressure switch can help conserve water and reduce energy consumption. The pump operates only when water demand causes the system pressure to fall below the pre-set level, ensuring that water flow is supplied only when required. This controlled operation helps minimise unnecessary pump running, reduces wear and tear on the electropump, and can contribute to a longer service life.
Model Identification: Davey Horizontal Multistage pumps fitted with a mechanical pressure switch are identified by the letter “P” at the end of the product code. For example, HM270-19P denotes a Horizontal Multistage electropump supplied with a pressure switch configuration.
Pressure Tank
Certification
To support market entry into regions such as Malaysia and other parts of Southeast Asia, Davey ensures that its Horizontal Multistage centrifugal pumps comply with relevant international certifications and regulatory standards. These certifications confirm product safety, performance consistency, and manufacturing quality for residential, commercial, and controlled water applications.
SGS Certification: Certification and testing by Société Générale de Surveillance (SGS) verifies that the HM series meets required electrical safety standards for residential use. This includes assessment of risks such as electric shock, electrical short circuits, fire hazards, and ensuring that the pump’s enclosure and components are properly insulated and safely contained.
European Standards: Compliance with European Standards ensures that the Horizontal Multistage pump meets harmonised technical and safety requirements across Europe. These standards cover product safety, performance consistency, environmental considerations, and market interoperability.
International Electrotechnical Commission (IEC): The IEC sets global standards for electrical and electronic technologies. Davey’s compliance with IEC standards ensures that its pumps align with internationally recognised benchmarks for electrical safety and performance, supporting broader global trade compatibility and mutual recognition arrangements.
Australian Standards: As a manufacturer with strong roots in Australia, Davey ensures compliance with Australian Standards, which govern the safety and performance requirements for electrical and pumping equipment. These standards are independently regulated and ensure product reliability and user safety.
- AS/NZS 4020:2005: The AS/NZS 4020:2005 standard confirms that materials used in contact with drinking water are safe for potable water applications. Components of the Horizontal Multistage pump are tested to ensure they do not introduce harmful substances into the water supply.
New Zealand Standards: Compliance with New Zealand Standards further supports product safety and suitability for potable water systems, reinforcing regional acceptance across Oceania markets.
ISO 9001: ISO 9001 certification confirms that Davey operates under a recognised quality management system, ensuring consistent manufacturing processes, controlled production standards, and uniform product quality across batches.
ISO 14001: ISO 14001 certification reflects Davey’s commitment to environmental management systems. This includes sustainable manufacturing practices such as energy efficiency improvements, waste reduction, recycling initiatives, and responsible resource usage throughout production and distribution.
Together, these certifications demonstrate that Davey’s HM90-11T Horizontal Multistage centrifugal pumps meet internationally recognised standards for safety, quality, and environmental responsibility, supporting their reliability and acceptance across global markets.
Single-Speed Motor Pump
Davey’s HM90-11T Horizontal Multistage pump is designed to deliver consistent and stable water pressure throughout everyday usage. As a centrifugal pump, it maintains uniform flow performance across varying demand conditions, making it suitable for both residential and commercial applications.
Easy Setup: Installation of the Horizontal Multistage electropump is straightforward. In typical setups, the pump is positioned below the water tank, connected to the required piping system, and then powered on. Once installed, it operates as part of the water supply system without the need for additional complex configuration, making it suitable for both household and commercial users seeking a direct and efficient pumping solution.
Starts Per Hour: Certain models of Davey’s HM90-11T Horizontal Multistage pump are capable of handling more than 200 starts per hour, which reflects strong cycling durability under variable demand conditions. This capability helps reduce the risk of mechanical stress in systems with frequent on/off operation. However, this specification applies only to selected Horizontal Multistage pump models.
Reliability And Proven Design: The Horizontal Multistage pump range has been in use for a long period, supported by established mechanical engineering design principles. Its reliability is reinforced by extensive research and development, a well-established service network, and the availability of spare parts, which supports long-term maintenance and operational continuity.
Cost-Efficiency: The system is designed for efficient operation with minimal need for ongoing adjustment once installed. Combined with streamlined manufacturing processes and an established supply chain, Davey’s Horizontal Multistage water pump can be produced and distributed at scale. This contributes to a cost-effective solution suitable for residential, agricultural, and commercial water supply applications.
Infographic: HM90-11T For The Household
A visual representation has been created by Davey Malaysia’s mechanical engineers to organise the key factors of a landed residential property, helping to identify the appropriate water pump requirements for the specific dwelling, as shown:
Specifically for the HM90-11 series of the Horizontal Multistage water pump, it can be said to follow the DynaDrive version of DD90 iteration, which is capable of powering water infrastructures of 2-3 storeys of a house. This makes up to either 5-7 shower heads to 8-10 pipes available.
Inlet Sizing
The main function of a suction inlet in any water pump is to allow fluid to enter the system so it can be further pressurised. This process varies depending on the type of centrifugal pump being used.
For example, in a sump pump, wastewater or sewage may be drawn into the system, where components such as a grinder or filter strainer help remove debris. This design supports flood control and wastewater management applications.
In contrast, Davey’s HM90-11T Horizontal Multistage pump is designed specifically to draw in clean water only. It is intended for use as part of a home pressure system, where the incoming water supply is free from solid waste or contaminants.
Unidirectional Flow: The electrical motor in the HM90-11T Horizontal Multistage water pump operates by creating pressure differences that draw water into the system. This flow is directed in a unidirectional manner toward the impeller section, where pressure is progressively increased through multiple stages.
Inlet Sizing And Compatibility: Different versions of the Horizontal Multistage electropump are manufactured with varying inlet sizes to ensure compatibility with different residential and commercial piping systems. This helps maintain balanced flow conditions and prevents issues such as overflow or flow restriction.
If the pipe diameter does not match the pump inlet size, appropriate connectors or adapters can be used to bridge the dimensional difference and ensure a secure, functional connection.
Net Positive Suction Head (NPSH): Davey’s Horizontal Multistage water pump operates effectively when sufficient suction conditions are achieved and air pockets are absent within the system. This condition relates to Net Positive Suction Head (NPSH), which ensures that the pump receives water at the required pressure to maintain stable and efficient operation without cavitation.
Reduced Friction and Flow Efficiency: Larger inlet diameters in a centrifugal pump can reduce flow resistance, allowing water to move more freely into the system. This results in improved suction efficiency and smoother operation. Lower resistance also supports faster stabilisation of flow conditions during pump start-up, contributing to more efficient system performance.
Stainless Steel Volute
In the HM90-11T Horizontal Multistage water pump, the volute may appear cylindrical externally, housing multiple stages such as impellers and diffusers. However, internally it is designed in a spiral shape and constructed from a durable, polished composite metal.
This design serves several key functions:
Flow Enhancement: The spiral-shaped volute helps guide and accelerate water as it passes through each impeller stage, before being discharged through the outlet. This controlled flow reduces turbulence and improves overall flow efficiency, allowing the pump to maintain consistent discharge performance.
Protective Casing: The volute casing also acts as a protective barrier, helping to prevent external contaminants or debris from entering the internal system. This protects the Horizontal Multistage pump components and helps maintain a clean and stable water supply throughout operation.
Interchanging Energy States: In a Horizontal Multistage pump, the process begins as the electric motor generates suction, drawing water into the system. The water then passes through multiple impellers, where it gains kinetic energy. Due to centrifugal action, the water is forced outward toward the casing walls and guided through the volute chamber before being discharged at the outlet.
During this process, energy is converted from kinetic energy to pressure energy. As the volute fills, flow velocity decreases while pressure increases, consistent with Bernoulli’s principle.
Self-Priming Condition And Cavitation Risk: Once the volute casing is fully filled with water, the system becomes free of trapped air, supporting stable operation. This condition helps maintain effective priming of the Horizontal Multistage pump.
If air becomes trapped within the system and enters the impeller section, it can disrupt flow and potentially lead to cavitation, which may cause damage to internal components during operation.
Impellers And Diffuser
Staging Bodies and Internal Structure: Within the volute chamber of a Horizontal Multistage water pump, the internal components such as impellers and diffusers are arranged in a series of ordered sections known as staging bodies. These stages guide the water progressively from one phase to the next through the pump system.
The staging bodies also function as structural supports, helping to secure and align the internal components in place during operation. This ensures stability as the pump runs at high rotational speeds.
Pressure Build-Up Across Stages: As water moves through each stage, pressure is gradually increased from one section to the next. This staged pressure rise ensures that sufficient water pressure is delivered for everyday applications such as faucets, showers, and other domestic water usage requirements.
Closed Impeller Design
Closed Impeller Design: In a Horizontal Multistage water pump, closed impellers are mounted onto the shaft to improve fluid handling during rotor operation. This design helps reduce axial thrust load, contributing to smoother mechanical performance.
Improved Hydraulic Performance: A closed impeller features a double-sided (front and back) shroud construction that guides water efficiently through the vanes. This controlled flow helps ensure a stable and consistent discharge, improving overall hydraulic efficiency as fluid is directed toward the outlet using centrifugal force.
Cavitation Reduction: The structural design of the impeller reduces the likelihood of cavitation, which occurs when vapor bubbles form and collapse within the fluid. By maintaining more stable flow conditions, the Horizontal Multistage pump is better protected from internal damage caused by these pressure fluctuations.
Extended Service Life: By reducing thrust load and mechanical stress on components such as bearings and the shaft, the system experiences lower wear over time. This contributes to improved reliability, reduced maintenance requirements, and a longer operational lifespan for the Horizontal Multistage centrifugal pump.
Stainless Steel Construction: In a Horizontal Multistage water pump, stainless steel is used for components such as the impeller and diffuser to resist corrosion and material degradation caused by continuous exposure to water. This ensures durability and reliable performance throughout repeated operating cycles.
Smooth Surface Finish: Before assembly, the impeller is finely polished to achieve a smooth surface finish. This reduces surface roughness, helping to minimise friction and flow turbulence within the pump. As a result, the Horizontal Multistage pump operates more efficiently, with improved fluid movement and reduced energy losses in terms of power consumption (kW).
Thermal And Mechanical Stability: High-grade stainless steel also provides stable mechanical properties across a range of operating temperatures. This means the impeller maintains consistent performance with minimal expansion or contraction, allowing the Horizontal Multistage pump to handle both warmer and cooler clean water sources effectively.
Backplate And Mechanical Seal: Electrical And Mechanical Separation
In a Horizontal Multistage pump, the interface between the electrical motor and the mechanical pumping system is critical to reliable operation. To prevent water from coming into contact with electrical components and causing short-circuiting, the system incorporates a backplate and a mechanical seal. These components work together with a gasket or washer to seal potential gaps and protect the motor assembly from fluid ingress.
Flow Direction And Discharge: During operation, water entering the pump is directed outward by centrifugal force and guided through the internal stages toward the discharge outlet. This ensures that the Horizontal Multistage centrifugal pump delivers water efficiently to the intended supply system.
Shaft Support And Alignment: The backplate and mechanical seal also help maintain proper alignment of the rotating shaft. By providing structural support and stabilisation during rotation, these components reduce the risk of vibration, misalignment, or mechanical imbalance, ensuring smooth and stable operation of the Horizontal Multistage pump.
Circlip Function And Design Variation: A circlip (also referred to as a clip spring in Davey Water Products’ official documentation) may be present in some configurations of the Horizontal Multistage water pump, positioned between the backplate and the mechanical seal. Its role is to help manage rotational stress and maintain consistent retention of the sealing assembly, ensuring the mechanical seal remains securely enclosed during operation.
O-Ring Tighteneed, With Vibration-Absorbent Spacers
O-Ring Sealing: In the Horizontal Multistage electropump, internal components are commonly sealed using O-rings to ensure tight fitting between joined sections and to minimise the risk of leakage. These O-rings are typically moulded from EPDM (ethylene propylene diene monomer) rubber, which offers strong resistance to heat and water exposure. Compared to materials such as neoprene, EPDM provides improved suitability for higher temperature conditions, making it appropriate for use in Davey’s Horizontal Multistage water pump systems. These sealing elements are often located within the volute casing.
Spacer Function: Spacers are also used within the pump assembly to maintain correct alignment and separation between rotating components. This prevents direct contact between parts that could otherwise cause friction or mechanical wear.
In addition, spacers help maintain proper positioning of bearings, ensuring that internal components remain correctly aligned during operation. This reduces the risk of excessive compression or misalignment when the Horizontal Multistage pump is running under load.
Vibration Absorption: In the Horizontal Multistage centrifugal pump, spacers also contribute to reducing mechanical stress by helping to dampen and distribute vibration generated during operation. While primarily used to maintain correct spacing and alignment between components, they also act as passive vibration dampers, helping to reduce the transmission of unwanted mechanical movement through the system. This contributes to smoother operation and helps minimise overall stress on internal components.
Material Construction: In the Horizontal Multistage water pump, internal components are manufactured using durable stainless steel grades to ensure strength and corrosion resistance across the system. Key parts such as the impellers, mechanical seal, spacers, circlip, and volute casing are typically made from stainless steel 304 (SUS304) to provide consistent structural integrity and resistance to wear in continuous water contact applications.
The pump shaft, which is responsible for transmitting rotational power from the motor to the hydraulic stages, is manufactured from stainless steel 316 (SUS316). This grade offers enhanced corrosion resistance and mechanical durability, making it suitable for continuous rotational load and long-term operation within the Horizontal Multistage pump system.
Operating Limits of HM90-11T Horizontal Multistage Pump
| Operating Limits | |
| Maximum continuous flow rate | 200L / min (53 US gallons) |
| Maximum operating pressure | 700 kPa* (102 psi) |
| Maximum current | 10 amp |
| Cut-in pressure range | 80% of pump shut-off head |
| Maximum water temperature | 65°C (149°F) |
*Dependent on the optional tank pressure rating, operating pressures of up to 820 kPa may be achieved.
*The symbol “L” is used to represent litre.
*kPa (kilopascal) is a derived unit of pressure.
*psi (pounds per square inch) is another commonly used unit of pressure.
*Amp is the shortened form of ampere, also represented as “A”.
*Degrees Celsius are written as °C, while °F (degrees Fahrenheit) is the United States customary unit of temperature measurement.
Hydraulic Performance of Horizontal Multistage Pump With Torrium2
| Single Phase Models | HM90 |
Motor: P1 kW P2 kW | HM90-11T – P1 kW: 1.4 HM90-11T – P2 kW: 1.05 |
Amps: Run Start | HM90-11T – Run: 6.5 HM90-11T – Start: 28 |
Ports (BSP): Suction Discharge | All – Suction: 1.25 F All Discharge – 1 M |
| Nominal operating pressure (kPa) | 420 |
| Maximum pump pressure (kPa) | HM90-11T: 585 |
| Tank air pre-charge (kPa) | HM90-11T: 410 |
| Nominal flow (L / min) | All in 90 L / min (24 US gallons) |
Hydraulic Loss of HM Pump With Torrium2
Electrical Data
| Pump | |
| Speed | 2900 rpm |
Supply voltage
| 230±10% |
| Supply frequency | 50 Hz |
Enclosure class
| IP55 |
| Insulation class | Class F |
| Torrium2 | |
Voltage | 220V-240V ± 10% |
Phase | Single |
Hz | 50 / 60 |
IP rating | IP56 |
Maximum load current | 10A |
Maximum motor size @ 240V input | 1.8 kW |
Surge protection | Varistor |
*RPM is the abbreviation for revolutions per minute.
*Hz is the unit hertz, used to measure frequency.
*Current measured in “A” represents ampere.
*kW is the abbreviation for kilowatt.
Materials of Construction
| Materials of construction | |
| Part | Material |
| Casing | 304 stainless steel |
| Impellers | 304 stainless steel |
| Stages (casing) | 304 stainless steel |
| Pump shaft | 316L stainless steel |
| Stage centring device | 304 stainless steel |
Mechanical seal:
| Carbon Ceramic 316 stainless steel EPDM |
| O-ring | EPDM |
| Plug | 316L stainless steel |
| Motor shell & lantern bracket | Aluminium with baked polyester powder coat finish |
| Motor feet | Xenoy |
| Fan cowl / rear foot (models up to 1.05kW) | Polypropylene |
Horizontal Multistage Pump's Q-H Curve For HM60 & HM90
Included In The Box
Horizontal Multistage Water Pump – HM90-11T
User Manual
Proof of Purchase
24 Months of Manufacturer Warranty (Increased by Another 6 Months with e-Warranty Scheme)
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