QBY5 Air-Operated Diaphragm Pump – 3-Way Pilot Valve, No Stalling

The QBY5 is the fifth-generation QBY, and its headline change is the air-distribution valve. Older air valves could reach a “dead point” and stall; the QBY5 uses a three-way pilot valve that eliminates that dead point, so the pump keeps cycling smoothly and will not freeze mid-stroke.

In practice that means more reliable starting, steadier flow and less fiddling on the line — useful on continuous duties where an unattended pump must simply keep running. It keeps all the familiar QBY strengths: self-priming, run-dry, seal-less and spark-free.

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

Applications: continuous chemical transfer, wastewater, food and beverage, coatings, ceramics, mining slurry, unattended process duty

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