Diaphragm pumps · QBY

QBY Air-Operated Double Diaphragm Pump

Name: QBY Air-Operated Double Diaphragm Pump
Brand: JIABO

Air-operated double diaphragm (AODD) pumps for chemicals, viscous liquids and solids-bearing process fluids where compressed-air drive and compatible wetted materials are required.

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Diaphragm pumps · QBY

Typical applications

Where this series may fit.

Application fit and final model depend on operating conditions. Please confirm with the current technical sheet.

Process-liquid transfer
Transfer where air drive is preferred
Applications requiring liquid-compatible wetted parts

Technical overview

How this range is used.

These are series-level characteristics, not a performance guarantee for a specific model. Confirm flow, head or pressure, power, dimensions, materials, and operating limits against the current datasheet.

Operating principle
Compressed air alternately moves diaphragms to draw in and discharge liquid.
Configuration
Air-operated, positive-displacement diaphragm pump.
Liquid suitability
Process liquids selected against diaphragm, valve, and wetted-part compatibility.
Typical use
Transfer duties where an air-driven pump is preferred.

QBY-K product overview

Air-operated double-diaphragm positive-displacement pump.

The QBY-K uses compressed air to drive reciprocating diaphragms. Alternating air-valve motion changes the chamber volume, drawing liquid into one side while discharging from the other. The diaphragm separates the pumped liquid from the air mechanism and eliminates a rotating shaft seal. Available body configurations include cast iron, aluminium alloy, stainless steel, engineering plastic, fluoropolymer-lined and rubber-lined versions; material availability must be confirmed by model.

Air-powered operation with no electric drive motor at the pump.
Self-priming capability and controlled dry-running capability within the confirmed operating instructions.
Flow and head can be adjusted through the air-supply pressure and flow.
Low shear compared with many high-speed rotary pumps.
Ball-valve flow path can handle suspended particles within the model limit.
No shaft seal between the liquid chamber and drive mechanism.

Design characteristics

Simple pneumatic control.

Compressed-air exhaust expands and cools rather than adding motor heat at the pump.
Grounding and a properly engineered installation can reduce electrostatic ignition risk; site hazardous-area requirements still govern.
The pump can stop against a closed discharge and restart when the load returns, subject to correct air regulation.
No oil lubrication is required for the stated pump design.
Compact construction, few wear components and no complex electrical control system at the pump.
Submerged operation is possible only for configurations approved for immersion and with the exhaust routed correctly.

Typical media and applications

From clean liquids to viscous slurries.

Food and high-viscosity products such as fruit pulp, syrup, molasses, chocolate and compatible pastes.
Paints, pigments, resins, adhesives, glues, emulsions and fillers.
Ceramic glaze, cement grout, mortar, rubber slurry and compatible abrasive slurries.
Wastewater, mine and tunnel drainage, oily water, sludge and general tank clean-out.
Petroleum products, temporary tank transfer and compatible tanker or barge stripping duties.
Compatible corrosive, volatile, flammable or toxic liquids where the complete pump, grounding, air supply and site controls have been approved.
Feed service for compatible solid–liquid separation and filter-press systems.

General range

Series-level technical limits.

Flow: 0–30 m³/h
Head: 0–50 m
Nominal port range: 10–100 mm
Air-pressure range: 0.1–0.7 MPa
Self-priming lift: 5–7 m, depending on model and conditions

Selection cautions

Confirm every wetted component.

Temperature: The supplied series description states −15°C to +120°C as the general technical range. Higher-temperature suitability must not be assumed; confirm body, diaphragm, ball, seat and seal limits.
Viscosity: The description references liquids below approximately 10,000 cP, but actual capacity and suction performance decrease with viscosity.
Hazardous liquids: Compatibility, grounding, ventilation, exhaust routing and local hazardous-area compliance require project review.

QBY-K performance parameters

Eight stainless-steel pneumatic diaphragm-pump sizes.

All listed body-material families require confirmation. The exact diaphragm, ball and seat materials determine chemical and temperature suitability.

Model	Flow	Head	Outlet pressure	Suction lift	Particle passage	Maximum air pressure	Maximum air consumption
QBY-K10	0–0.8 m³/h	0–50 m	6 kgf/cm²	5 m	1 mm	7 kgf/cm²	0.3 m³/min
QBY-K15	0–1 m³/h	0–50 m	6 kgf/cm²	5 m	1 mm	7 kgf/cm²	0.3 m³/min
QBY-K25	0–2.4 m³/h	0–50 m	6 kgf/cm²	7 m	2.5 mm	7 kgf/cm²	0.6 m³/min
QBY-K40	0–8 m³/h	0–50 m	6 kgf/cm²	7 m	4.5 mm	7 kgf/cm²	0.6 m³/min
QBY-K50	0–12 m³/h	0–50 m	6 kgf/cm²	7 m	8 mm	7 kgf/cm²	0.9 m³/min
QBY-K65	0–16 m³/h	0–50 m	6 kgf/cm²	7 m	8 mm	7 kgf/cm²	0.9 m³/min
QBY-K80	0–24 m³/h	0–50 m	6 kgf/cm²	7 m	10 mm	7 kgf/cm²	1.5 m³/min
QBY-K100	0–30 m³/h	0–50 m	6 kgf/cm²	7 m	10 mm	7 kgf/cm²	1.5 m³/min

The table states maximum range values, not a single simultaneous duty point. Confirm the selected model’s air requirement and operating curve at the actual discharge pressure, viscosity and suction condition.

Installation and maintenance

Practical operating precautions.

Foundation bolts may not be necessary where vibration and piping loads are adequately controlled, but the installation must remain stable and supported.
Use clean, dry compressed air and install suitable filtration if contamination may enter the air valve.
For liquids that can freeze or solidify, isolate the inlet and purge or drain the pump before shutdown.
When replacing diaphragms, clean the internal connecting rod and bushes and protect the PTFE sealing rings during reassembly.
Never treat the absence of an electric motor as automatic hazardous-area approval; verify grounding, air exhaust, materials and local regulations.

Selection information

What we need to size it.

Liquid composition, viscosity and solids
Required flow and discharge pressure
Available compressed-air supply and material compatibility

Reference specification sheet

Parameters for an international quotation.

These values describe common enquiry formats in Europe and North America—not confirmed ratings for every JIABO model. The quotation and motor nameplate control the final specification.

Primary duty data	Required flow, discharge pressure and suction condition; describe solids and acceptable pulsation.
Drive utility	QBY: available compressed-air pressure and volume. DBY: electrical supply, with regional voltage/frequency confirmed.
Electrical reference	For electric-drive DBY enquiries: Europe commonly 220–240 V 1-phase or 380–415 V 3-phase at 50 Hz; North America commonly 230/460 V 3-phase at 60 Hz.
Construction to specify	Body, diaphragm, ball, seat and seal materials selected against the actual liquid and cleaning chemicals.
Documents to request	Flow versus pressure/air-consumption data, solids limit, connection size, dimensions and approved material combination.

Regional electrical examples are reference conventions supported by published manufacturer data: Grundfos 230/400 V, 50 Hz data ↗ and Franklin Electric 230/460 V, 60 Hz data ↗. Availability must be confirmed for the selected JIABO model.

Technical confirmation

Ask for the current model table and curve.

Use the published table as a shortlist only. Send your operating point so JIABO can confirm the exact model, current performance curve, motor supply and materials.

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