Hongnuo (shenyang) General Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of piston type flow switch in China. Welcome to buy high quality piston type flow switch at competitive price from our factory. We also accept customized orders.
Why choose this one?
1. Factory-set, ready to use
Setpoint indicated on scale. No potentiometer, no screwdriver, no calibration in flowing liquid. Install it and it works.
2. Mechanical piston + reed switch
No power needed for sensing – only for the switch output. Reliable in dirty media. Not affected by temperature or pressure changes.
3. Three housing materials
Plastic (economical, light duty). Aluminium (industrial, corrosion-resistant). Stainless Steel (high pressure, aggressive media). Same piston design, same reliability – choose the housing that fits your process.
Specs at a glance
| Parameter | Value |
|---|---|
| Media | Liquid or gas |
| Setting range | 0.6 – 70 L/min (water) |
| Accuracy | ±5% of full range |
| Pressure loss | 0.3bar at 25L/min |
| Max pressure | 10bar (plastic) / 50bar (aluminium) / 100bar (stainless steel) |
| Medium temp | Max 90°C |
For more parameters, please click on "Specifications".
Select by your application
Step 1: Choose your housing material
| Material | Best for | Max Pressure |
|---|---|---|
| POM Plastic (P) | Water, weak chemicals, light industrial | 10bar |
| Anodised Aluminium (L) | Oils, air, general industrial | 50bar |
| Stainless Steel (S) | Aggressive media, high pressure, food/pharma | 100bar |
Step 2: Choose your flow range
| Range Code | Water Range (L/min) | Best for |
|---|---|---|
| 007 | 0.6 – 8 | Very low flow |
| 008 | 0.6 – 8 | Low flow |
| 015 | 1 – 15 | General purpose |
| 025 | 2 – 25 | Medium flow |
| 040 | 5 – 40 | High flow |
| 070 | 27 – 70 | Very high flow |
Step 3: Choose your thread
| Code | Thread |
|---|---|
| G14 | G1/4" female |
| G38 | G3/8" female |
| G12 | G1/2" female |
| G34 | G3/4" female |
| G1 | G1" female |
Example use case: Cooling water line at 15L/min, 8bar pressure, standard industrial. Choose: Aluminium housing (L) + 015 range + G1/2 thread (G12).
Products Description
Air compressor
Compressed air flow detection. Aluminium or stainless steel housing for pressure up to 50–100bar. Setpoint factory-set – no field calibration required.
Cooling systems
Cooling water flow verification on chillers and heat exchangers. Plastic housing for low pressure, stainless for high pressure. Low pressure loss – doesn't restrict flow.
Hydraulic equipment
Lube oil flow monitoring on gearboxes and hydraulic power units. Stainless steel housing for high pressure. Scale visible for quick visual check.
Water treatment
Pump discharge flow verification. Plastic housing for clean water, stainless for aggressive chemicals. Simple on/off output – no complex setup.
Pneumatic systems
Pressurised air flow detection on automated equipment. Aluminium housing lightweight, corrosion-resistant. Output connects directly to PLC or relay.
Special order notes:
- When ordering, specify media flow direction, media type, pipe diameter, and expected flow rate – we can preset the switch at the factory.
- For gas media, specify pressure (gauge/absolute), temperature, and media type.
- Special threads and custom flow settings available on request.
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HNF10-D Piston Type Flow Switch |
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Specific Parameters |
Value / Description |
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Measurement Principle |
When a liquid or gas flows through the switch, it drives a piston equipped with a magnet. The movement of the piston causes the magnet to actuate a sealed reed switch, thereby detecting the presence or absence of flow and providing a switching signal. |
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Nominal Diameter Range |
Thread G1/2", G1/4", others customizable |
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Wetted Parts Material |
Housing: POM plastic, piston: POM plastic, spring: stainless steel, seal: NBR |
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Connection Method |
Threaded Connection |
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Maximum Measurement Error |
±5 Full Scale |
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Measurement Range |
0.6-70L/min |
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Maximum Process Pressure |
10bar(plastic), 50bar(aluminum profile), 100bar(stainless steel) |
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Medium Temperature Range |
Maximum 90 ℃ |
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Transmitter Housing Material |
Unrestricted |
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Display/Operation |
No display |
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Outputs |
Reed switch, rated for 24VDC/250VAC, 100mA |
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Power Supply |
24VDC / 230 V AC |
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Certificate |
CE ISO9001 ISO14001 ISO45001 |
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Functional Safety |
Functional safety follows the IEC 61508 standard, allowing its use in safety applications as stipulated by the IEC 61511 standard. |
