Understanding how a QBY works explains why it handles jobs other pumps cannot. It is a positive-displacement pump with two symmetrical chambers, each holding a flexible diaphragm; a connecting rod lin…
| Flow Rate | 0-30m³/h |
|---|---|
| Head | 0 – 50 / 70m |
| Inlet / Outlet Diameter | 10 – 100mm |
| Material | PP Engineering Plastic, Aluminum Alloy, Cast Iron, Stainless Steel |
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Understanding how a QBY works explains why it handles jobs other pumps cannot. It is a positive-displacement pump with two symmetrical chambers, each holding a flexible diaphragm; a connecting rod links the two diaphragms into one moving assembly.
The cycle
Compressed air enters the distribution valve and pushes one diaphragm; the linked diaphragm moves with it, while air behind the second chamber exhausts. At the end of the stroke the valve switches the air to the other chamber and the diaphragms reverse. Two ball check valves in each chamber open and close in turn, so fluid is drawn in on one side and pushed out on the other — continuously.
Why that matters
Because suction is created mechanically on every stroke, the pump self-primes and runs dry. Because the drive is air, there is no spark and no heat build-up. And because the diaphragms seal the fluid off completely, there is nothing to leak — the reasons a QBY suits corrosive, particle-laden, volatile and shear-sensitive fluids alike.
Applications: corrosive liquids, particle-laden fluids, high-viscosity media, volatile and flammable liquids, toxic media, food and slurry transfer
QBY Pneumatic Diaphragm Pump Technical Parameters
| Parameter | Specification Range |
|---|---|
| Flow Rate | 0 – 30 m³/h |
| Max Head | 0 – 50 / 70 m |
| Port Size (Caliber) | 10 – 100 mm |
| Working Temperature | -15℃ ~ +150℃ |
| Working Air Pressure | 0.1 – 0.7 MPa |
| Self-Priming Height | 5 – 7 m |
| Max Passable Solid Particle | 10 mm |
HAQUANPUMP builds the full QBY range in-house. Send us your fluid, flow and head, and we will recommend the exact model, body material and diaphragm for the job.
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