Brushless Micro Water Pump | OEM & ODM Supplier
Pinmotor supplies brushless micro water pumps for OEM devices that need stable water transfer, compact installation, and lower motor maintenance than brushed pump options. The series can be matched by voltage, flow rate, pressure or head requirement, connector structure, wire length, material, and installation space.
What Is a Micro Diaphragm Water Pump?
A micro diaphragm water pump is a compact positive displacement pump built with a DC motor, eccentric drive, connecting rod, flexible diaphragm, pump chamber, inlet valve, outlet valve, pump head, inlet port, and outlet port.
When the motor runs, the eccentric drive converts rotation into diaphragm reciprocation: the diaphragm moves back to draw liquid into the chamber and moves forward to push liquid out through the outlet valve. This structure supports self-priming liquid transfer and short dry-run tolerance, making it suitable for OEM devices with compact water paths, intermittent operation, and limited installation space.
Key Features of Pinmotor Diaphragm Pumps
Pinmotor diaphragm pumps are designed for compact OEM devices that require self-priming liquid transfer, short dry-run tolerance, low maintenance, material matching, controlled noise, and small installation space.
Self-Priming Performance
This micro diaphragm pump series supports self-priming water transfer for compact water path designs. Depending on the pump structure and tubing layout, the suction head can reach up to 5m, which helps when the water tank is lower than the pump or the device has a longer inlet path.
Stable Pressure Output
Pressure options can cover ≥30 PSI and selected configurations can reach 30–130 PSI, making the pump suitable for water paths with different resistance levels, such as spray nozzles, coffee machine modules, oral irrigators, and small booster systems.
Short Dry-Run Tolerance
The diaphragm structure can tolerate short no-liquid operation during start-up or intermittent use. For OEM projects, dry-run time should be tested with the final duty cycle, water path, liquid type, and working temperature.
Oil-Free Diaphragm Structure
The pump uses an oil-free diaphragm structure. Liquid mainly contacts the diaphragm, valves, pump head, and connectors, so material selection can be matched according to the application, liquid type, and compliance requirements.
Low Noise for Built-In Devices
Reference noise levels are commonly around ≤65dB at 30cm for this type of micro diaphragm water pump. Actual noise depends on mounting method, housing resonance, tubing fixation, and driving mode, so it should be tested after installation in the complete device.
Compact and Lightweight Design
With a compact structure and reference weight around 60g in selected configurations, this pump series is suitable for small equipment with limited internal space. Connector direction, wire length, pump head structure, and mounting method can be adjusted according to the device layout.
Micro Diaphragm Water Pump Series & OEM Selection Parameters
This series includes brushed 3V–12V options for cost-sensitive OEM devices and brushless 5V–24V options for longer-life applications.
Flow options cover about 0.1–2.5 L/min, with voltage, pressure, noise, suction, life test, and connector details available for model comparison.
| Series | Flow Range | Pressure Range | Port O.D. | Pump Head | Suction Head | Best Fit |
|---|---|---|---|---|---|---|
| 370-XA | 0.3–0.8 LPM | 30–130 PSI | Ø4.8mm | ≥5m | ≥5m | Higher-pressure compact water paths |
| 370-XB | 0.3–1.2 LPM | ≥30 PSI | Ø8.0mm | ≥5m | ≥5m | Higher-flow water transfer with side outlet |
| 370-XC | 0.3–1.2 LPM | ≥30 PSI | Ø6.5mm | ≥5m | ≥5m | Standard high-flow structure |
| 370-XE | 0.3–1.2 LPM | ≥30 PSI | Ø6.5mm | ≥5m | ≥5m | Angled outlet for special tubing layout |
| 370-XF | 0.3–1.0 LPM | 30–100 PSI | Ø6.5mm | ≥5m | ≥5m | Balanced flow and pressure output |
| 370-XAZ | 0.3–0.7 LPM | 30–130 PSI | Ø5.0mm | ≥5m | ≥5m | Leak-resistant design for portable coffee machines |
| 370-XJZ | 0.5–1.2 LPM | ≥30 PSI | Ø6.5mm | ≥5m | ≥2m | Leak-resistant design with higher flow output |
370 Series Brushless Micro Diaphragm Water Pump Comparison
| Series | Flow Range | Pressure Range | Port O.D. | Pump Head | Suction Head | Best Fit |
|---|---|---|---|---|---|---|
| 370-BL-XA | 0.3–0.8 LPM | 30–130 PSI | Ø4.8mm | ≥5m | ≥5m | Long-life option for compact high-pressure water paths |
Choose a brushed pump if your device mainly needs stable water transfer, controlled cost, and intermittent operation. Choose a brushless pump if your project needs longer running life, lower noise, or more stable motor control. Before mass production, test the pump with your real tubing, nozzle, liquid type, duty cycle, and installation space.
Not sure which pump fits your device? Pinmotor can help recommend a suitable pump for sample testing.
Micro Diaphragm Water Pump Application & Functional Roles
In OEM devices, a micro diaphragm water pump is not just a liquid transfer part. It helps build the water path, control flow, provide pressure, support self-priming, and fit into compact internal structures.
Medical Devices
In medical and healthcare equipment, the micro diaphragm water pump is used to move liquid through a controlled fluid path. It can support cleaning, rinsing, sampling, or liquid supply functions in compact medical modules. Buyers should check flow stability, sealing performance, material compatibility, noise, and duty cycle before using it in the final device.
Coffee & Beverage Equipment
In coffee machines, portable coffee makers, water dispensers, and beverage devices, the pump draws water from the tank and delivers it to the heating, brewing, or dispensing module. Its role is to provide stable water supply and pressure output, especially when the water tank is lower than the pump or the internal water path is narrow.
Smart Home Appliances
In smart toilets, floor washers, humidifiers, and cleaning appliances, the pump helps move water inside a limited housing space. It can support flushing, spraying, misting, drainage, or cleaning water circulation. For these products, compact size, connector direction, noise, and installation layout are usually key selection points.
Lab & Analytical Equipment
In laboratory instruments, analyzers, samplers, and testing devices, the pump provides small-flow liquid transfer for sampling, reagent delivery, rinsing, or waste liquid movement. The main requirement is not only flow rate, but stable output under a defined liquid path, tubing resistance, working cycle, and material condition.
Printing & Inkjet Systems
In inkjet printers, coding machines, and ink circulation systems, the pump helps move ink, cleaning liquid, or maintenance fluid through a small liquid path. Its function is to support liquid supply, circulation, or flushing. Material compatibility must be checked when the medium contains ink, solvent, or cleaning additives.
Environmental Monitoring
In water quality testing, liquid sampling, and portable monitoring equipment, the pump draws liquid samples from a container, tube, or external source and sends them to the testing module. Self-priming ability, suction head, low power consumption, and compact size are important for portable or battery-powered systems.
Find the Right Micro Diaphragm Water Pump for Your Project
Tell us your device type, voltage, flow rate, pressure target, tubing size, and working cycle. Pinmotor can recommend a pump for testing before mass production.
Liquid-Contact Materials for Micro Diaphragm Water Pumps
For OEM buyers, material selection should be confirmed before placing a bulk order, especially when the pump is used for drinking water, coffee machines, beverage equipment, cleaning liquids, weak acid, weak alkali, or alcohol-containing liquids. Pinmotor can match food-grade liquid-contact materials such as EPDM diaphragms and engineering plastic pump heads, and provide relevant compliance documents according to project requirements.Before mass production, we recommend testing the pump with the actual liquid, tubing, temperature, duty cycle, and installation structure to confirm sealing performance, flow stability, and long-term compatibility.
| Component | Standard Material | Optional Material | Application Notes |
|---|---|---|---|
| Diaphragm | Food-grade EPDM | PTFE / FKM | Suitable for clean water, drinking water paths, coffee machines, and beverage equipment. PTFE or FKM can be considered for special liquids. |
| Valves | Food-grade EPDM | FKM / FFPM | Affects sealing, backflow control, and long-term liquid compatibility. |
| Pump Head | PA6 / POM | PP / PPS | Selected according to liquid type, temperature, pressure, and chemical resistance needs. |
| Seals & Connectors | Project-based | Project-based | Matched by tubing size, connector direction, installation space, and leakage control requirements. |
Chemical Compatibility Guidance
Standard material options are suitable for common water transfer and beverage-related applications. For weak acid, weak alkali, alcohol-containing liquids, coffee liquid paths, and cleaning liquids, material selection should be checked with the actual medium and working temperature.
Not recommended without material verification: strong acid, strong alkali, concentrated chemicals, oil-based liquids, benzene-based solvents, or unknown mixed liquids. In these cases, please provide the liquid name, concentration, temperature, duty cycle, and required service life for compatibility review.
Need Custom Materials? Contact Our Engineers
OEM Customization Options for Micro Diaphragm Water Pumps
Pinmotor supports OEM customization for micro diaphragm water pumps used in compact liquid systems. Voltage, motor type, pump head material, connector direction, tubing interface, wire length, and branding can be adjusted according to the final device structure.
Pinmotor can match common DC voltage platforms, including 3V, 5V, 6V, 9V, 12V, and 24V. For battery-powered devices, USB-powered products, home appliances, or equipment control boards, voltage selection should be checked together with flow rate, pressure, noise, and temperature rise.
Different motor options can be selected according to cost, duty cycle, and service life requirements. Brushed motors are suitable for cost-sensitive and intermittent-use products, while brushless motor options can be evaluated for longer operating life, lower noise targets, or more frequent operation.
The diaphragm, valve, pump head, seals, and connectors can be selected based on the liquid type. For drinking water, coffee machines, beverage equipment, cleaning liquids, weak acid, weak alkali, or alcohol-containing liquids, material compatibility should be confirmed before sample testing and mass production.
Connector type and direction can be adjusted according to the device’s water path layout. Options may include hose barb, threaded interface, side outlet, angled outlet, or custom fitting. This helps reduce tube bending, improve assembly convenience, and fit limited internal space.
For OEM and ODM projects, Pinmotor can support logo printing, product labeling, custom packaging, and batch supply requirements according to the customer’s market and project needs.
Requirement Review
Confirm the application, voltage, flow rate, pressure target, liquid type, tubing size, connector direction, and installation space.
Solution Matching
Select the suitable motor, diaphragm, valve, pump head, connector, wire length, and mounting structure according to the device design.
Sample Testing
Prepare samples for device testing. Typical sample time is about 5–7 working days, depending on customization details.
Performance Adjustment
Check flow, pressure, suction, noise, leakage, temperature rise, and installation fit in the actual device, then adjust if needed.
Bulk Production
After sample approval, move to batch production. Typical production time is about 14–21 working days, depending on order quantity and customization level.
Why Choose Pinmotor as Your Micro Diaphragm Water Pump Supplier?
Pinmotor provides OEM/ODM micro diaphragm water pump solutions with stable production capacity, quality control, sample support, and export experience for global device manufacturers.
17+ Years Manufacturing Experience
Founded in 2008, Pinmotor has over 17 years of experience in micro pumps, micro motors, and micro valve manufacturing. We support OEM projects from pump selection, sample testing, structure matching to mass production.
100% Product Testing Before Shipment
Key pump performance can be checked before delivery, including flow rate, pressure, suction, noise, leakage, voltage, and appearance. For OEM projects, additional testing can be arranged according to working cycle, liquid type, and device requirements.
50 Million+ Annual Production Capacity
Pinmotor operates production bases in Shenzhen and Heyuan, covering about 20,000㎡ with 600+ employees. Annual capacity reaches about 50 million units, supporting stable OEM supply for micro pumps, motors, and related components.
Flexible Sample and MOQ Support
For project evaluation, sample quantity can usually start from 5–50 pcs. Project MOQ can start from around 500 pcs, depending on model, customization level, and production requirements.
Certified Quality System
Production is managed under ISO 9001 quality control, with material compliance support such as RoHS and REACH. For export projects, Pinmotor can also support required compliance documents based on the customer’s market and application.
Global OEM Supply Experience
Pinmotor supplies micro pump solutions for customers in 65+ countries, covering applications such as coffee machines, medical equipment, beauty devices, smart home appliances, water dispensers, spraying systems, and compact liquid control modules.
FAQ About Micro Diaphragm Water Pump
Can a micro diaphragm water pump run dry without damage?
Yes, it can tolerate short dry-run operation during start-up or intermittent use. Long-term dry running is not recommended and should be tested based on the actual duty cycle.
What is the maximum self-priming height of a micro diaphragm pump?
Selected Pinmotor micro diaphragm water pumps can reach up to 5m suction head. Actual performance depends on tubing length, liquid type, voltage, sealing, and installation position.
What is the difference between brushed and brushless micro diaphragm pumps?
Brushed pumps are suitable for cost-sensitive devices and intermittent operation. Brushless pumps are better for longer service life, lower noise, and more stable operation.
Are Pinmotor diaphragm pumps food-grade safe for coffee machines?
Yes. Pinmotor can provide food-grade liquid-contact material options, such as EPDM diaphragms and engineering plastic pump heads, for coffee machines, drinking water, and beverage equipment.
How do I choose the right micro vacuum pump for my project?
Sample preparation usually takes about 5–7 working days. Bulk production time depends on order quantity, customization level, and material preparation.
What chemicals can micro diaphragm pumps handle?
They can be matched for water, coffee, weak acid, weak alkali, alcohol-containing liquids, and some cleaning liquids. Strong acid, strong alkali, oil-based liquids, solvents, or unknown liquids require material verification before testing.
Request a Micro Diaphragm Water Pump Quote
Send us your voltage, flow rate, pressure target, liquid type, tubing size, and installation space. Pinmotor will help recommend a suitable pump for sample testing and OEM production.
