Choosing a metering pump starts with understanding the chemical dosing requirements of your system. The required flow rate, discharge pressure and chemical compatibility should be considered together, followed by the installation conditions, power supply and control requirements.
Three questions provide a useful starting point:
- What chemical are you dosing?
- What flow rate does the process require?
- What discharge pressure must the pump handle?
This guide explains how to approach these questions and compare AIDON’s JXM, JZM and JWM mechanical diaphragm metering pump series for chemical dosing applications.
1. Define the Required Chemical Dosing Flow
The first step is to establish how much chemical solution the pump needs to deliver, usually expressed in litres per hour (L/h).
Chemical dosing flow is different from the volume of water being treated. A plant’s water treatment capacity alone does not determine the required pump output. The target chemical dose and the concentration of the dosing solution also need to be considered.
When preparing your requirements, identify:
- The normal chemical dosing flow.
- The minimum and maximum flow needed during operation.
- Whether dosing will be continuous or intermittent.
- Whether the dosing rate needs to change as process conditions vary.
These details help determine both the required capacity and the adjustment requirements. If the dosing flow has not yet been calculated, provide the treatment water flow, target dose and chemical solution concentration for review.
2. Check Flow Rate and Discharge Pressure Together
Once the required dosing flow is known, confirm the pressure the pump must work against.
Relevant information includes the pressure at the injection point, the discharge piping arrangement and any valves or accessories that affect the required pump discharge pressure. If operating pressure varies, provide the expected range.
A pump must be selected to meet the required flow at the required pressure.
A series may include models with different combinations of flow and pressure. Its highest flow rating and highest pressure rating do not necessarily belong to the same model.
For example, a series covering up to 500 L/h and up to 1.2 MPa should not automatically be interpreted as offering 500 L/h at 1.2 MPa. The individual model specifications must be checked.
3. Compare the JXM, JZM and JWM Series
AIDON’s three mechanical diaphragm metering pump series offer different combinations of flow, pressure and motor power.
| Series | Flow Rate Across Available Models | Pressure Ratings Across Available Models | Motor Power |
|---|---|---|---|
| JXM | 9–500 L/h | 0.5–1.2 MPa / 5–12 bar | 0.37–0.55 kW |
| JZM | 237–2,000 L/h | 0.3–1.0 MPa / 3–10 bar | 0.55–1.5 kW |
| JWM | 12–150 L/h | 0.3–1.0 MPa / 3–10 bar | 40–90 W |
These ranges describe the models available within each series. They do not represent the adjustable operating range of a single pump, and the maximum values should not be combined into one operating point.
The following examples show how flow, pressure and motor power are paired for specific models:
| Model | Listed Flow Rate | Listed Pressure | Motor Power |
|---|---|---|---|
| JXM500/0.5 | 500 L/h | 0.5 MPa / 5 bar | 0.55 kW |
| JZM2000/0.3 | 2,000 L/h | 0.3 MPa / 3 bar | 1.5 kW |
| JWM150/0.3 | 150 L/h | 0.3 MPa / 3 bar | 90 W |
These examples provide a starting point for comparison. Final selection should also account for the chemical properties, required adjustment range, suction conditions and selected configuration.
View the AIDON mechanical diaphragm metering pump range for further product information.
4. Confirm Chemical Compatibility Across All Wetted Parts
Matching flow and pressure is only part of the selection process. The materials in contact with the chemical must also be suitable for the application.
AIDON’s listed wetted-part material options include PVC, PVDF, 316L stainless steel and PTFE. The appropriate combination depends on the chemical being dosed, its concentration, operating temperature and the selected pump configuration.
Compatibility should be reviewed across the complete wetted assembly, including the pump head, diaphragm, valve balls, valve seats and seals, as applicable.
A suitable pump head material alone does not confirm compatibility for the entire pump.
When requesting a recommendation, provide the chemical name, concentration and operating temperature. Also identify any unusual properties, such as high viscosity, suspended solids or a tendency to release gas, so that the liquid-handling configuration and installation requirements can be reviewed.
5. Review Power, Controls and Installation Conditions
Before confirming a model, check how the pump will be installed and operated within the dosing system.
Power supply: Specify the available voltage, frequency and phase. Motor power alone does not confirm electrical compatibility.
Control requirements: Explain whether the pump will use local manual adjustment, remote start/stop or automatic flow adjustment. If it will connect to a PLC or another controller, identify the required signal type and operating sequence. Available functions should be confirmed for the selected model and configuration.
Connections and piping: Confirm the required connection size and type, together with the suction and discharge piping arrangement. Provide the chemical tank position and its height relative to the pump.
Installation and maintenance access: Allow space for operation, inspection and servicing. For a replacement pump, check the mounting dimensions and existing pipe connections as well as the required dosing performance.
If your project requires tanks, mixers, piping and controls alongside the pump, review the complete arrangement as a chemical dosing system.
6. Prepare a Complete Metering Pump Enquiry
A clear enquiry helps narrow the selection to suitable models and configurations.
| Information to Provide | Details |
|---|---|
| Chemical | Name, concentration and operating temperature |
| Liquid properties | Viscosity, solids content or gas-release tendency, where relevant |
| Required dosing flow | Normal, minimum and maximum flow in L/h |
| Required discharge pressure | Normal and maximum pressure in bar or MPa |
| Operating schedule | Continuous or intermittent operation, including expected running hours |
| Power supply | Voltage, frequency and phase |
| Control requirements | Manual adjustment, remote operation or automatic control, including signal type |
| Installation conditions | Tank position, suction arrangement, pipe connections and available space |
For replacement projects, include a photograph of the existing pump nameplate and any available model or installation information. Confirm the current process requirements as well, especially if the chemical, dosing rate or operating pressure has changed.
Discuss Your Metering Pump Requirements with AIDON
Whether you are planning a new chemical dosing system or replacing an existing pump, start with the required flow, discharge pressure and chemical details.
Yixing Aidon Technology Co., Ltd. offers JXM, JZM and JWM diaphragm metering pump ranges with different flow, pressure and power combinations. Share your operating requirements with our team to discuss model selection, wetted-part materials, control options and quotation details.
WhatsApp: +86 189 2137 8801
Email: sales@yxaidon.com
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