QBY Air-Operated Diaphragm Pump (AODD)QBYS Stainless Steel Pneumatic Diaphragm Pump
The QBYS is the stainless-steel version of the QBY pneumatic diaphragm pump — SS304/SS316 for corrosive, food and hygienic fluids. Full size range, in stock.

Simple Flow AdjustmentMost pumps need variable frequency drives or complex controls to change flow. The QBY adjusts flow with a simple air regulator. Turn the knob to increase or decrease speed.How It…
| Flow Rate | 0-30m³/h |
|---|---|
| Head | 0 – 50 / 70m |
| Inlet / Outlet Diameter | 10 – 100mm |
| Material | PP Engineering Plastic, Aluminum Alloy, Cast Iron, Stainless Steel |
Simple Flow Adjustment
Most pumps need variable frequency drives or complex controls to change flow. The QBY adjusts flow with a simple air regulator. Turn the knob to increase or decrease speed.
How It Works
Higher air pressure makes the pump stroke faster. Lower pressure slows it down. Flow is proportional to stroke speed. This gives infinite adjustment within the pump’s range.
Practical Benefits
•
Match flow to process requirements
•
Reduce splashing during filling
•
Extend diaphragm life at lower speeds
•
Save compressed air when full flow isn’t needed

Alternative Method
Install a throttle valve on the discharge line. Closing the valve increases backpressure and slows the pump.
Applications Summary:
variable flow pumping, process control, filling operations, chemical dosing, flow regulation, industrial fluid handling
Thanks for reading from HAQUANPUMP. We supply QBY diaphragm pumps with simple flow control. Ask about air regulation accessories.
QBY Air-Operated Diaphragm Pump (AODD)The QBYS is the stainless-steel version of the QBY pneumatic diaphragm pump — SS304/SS316 for corrosive, food and hygienic fluids. Full size range, in stock.
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