Manufacturer-direct diaphragm pumps from Shinjo Pump. The third-generation QBK/QBY3 air-operated diaphragm pump. Flow up to 34.1 m³/h (568 L/min), head up to 70 m, outlet pressure ≥0.7 MPa, sizes DN10-DN100 (1/4"-4"), media temperature -20°C to 150°C. Browse our diaphragm pump models below or request a quote.
| Material | Cast Iron, Aluminium Alloy, Stainless Steel 304/316/316L, PP or PTFE flow parts; diaphragm in polypropylene, NBR, Neoprene, EPDM, PTFE, Viton, polyether or Teflon |
|---|---|
| Size | DN10-DN100 mm (1/4"-4") |
| Flow Rate (Q) | Up to 34.1 m³/h (568 L/min) for QBY3 series, for QBY4 series maximum up to 53 m³/h |
| Lift Head (H) | Up to 70 m for QBY3 series, for QBY4 series maximum up to 84 m |
| Outlet Pressure | ≥0.7 MPa (7 kgf/cm²) |
| Suction Lift | Up to 7 m — self-priming, no priming water required |
| Max Solid Diameter | Up to 10 mm |
| Max Viscosity | Up to 1,000 cP |
| Media Temperature | -20°C to 150°C |
| Power Source | Compressed air (QBY/QBK, air supply 0.3-0.7 MPa) or electric motor (DBY) |
| Model | Material & Working Parts | Best For |
|---|---|---|
| Polypropylene (PP/PVDF/PTFE) | Polypropylene (PP) body with PVDF or PTFE wetted parts options | Chemical duty — acids, alkalis and solvents where metal housings are not suitable |
| Aluminium Alloy | Aluminium alloy housing (material code L) | Paint, glue, grinding materials; can be soaked in media, conveys viscous liquid, no oil lubricant required |
| Stainless Steel | Stainless steel 304 / 316 / 316L housing (material code P / P316 / P316L) | Strong acid, alkali and corrosive liquids; suction lift up to 7 m, outlet pressure ≥0.7 MPa |
| Model | Max Flow (L/min) | Max Flow (m³/h) | Max Head (m) | Max Suction Lift (m) | Caliber DN (mm) | Air Inlet (in) | Max Particle (mm) |
|---|---|---|---|---|---|---|---|
| QBY3-10 | 18.9 | 1.13 | 70 | 2.5-3 | 10 | 1/4 | 1.5 |
| QBY3-15 | 18.9 | 1.13 | 70 | 2.5-3 | 15 | 1/4 | 1.5 |
| QBY3-20 | 57 | 3.4 | 70 | 4.5-7.6 | 20 | 1/4 | 2.5 |
| QBY3-25 | 57 | 3.4 | 70 | 4.5-7.6 | 25 | 1/4 | 2.5 |
| QBY3-25A | 151 | 9.1 | 70 | 5.4 | 25 | 1/2 | 3.2 |
| QBY3-32 | 151 | 9.1 | 70 | 5.4 | 32 | 1/2 | 3.2 |
| QBY3-40 | 151 | 9.1 | 70 | 5.4 | 40 | 1/2 | 3.2 |
| QBY3-50 | 378.5 | 22.7 | 70 | 5.48 | 50 | 1/2 | 5.48 |
| QBY3-65 | 378.5 | 22.7 | 70 | 5.48 | 65 | 1/2 | 5.48 |
| QBY3-80 | 568 | 34.1 | 70 | 5.48 | 80 | 1/2 | 6.3 |
| QBY3-100 | 568 | 34.1 | 70 | 5.48 | 100 | 1/2 | 6.3 |
Diaphragm pumps transfer corrosive, granular, high-viscosity, volatile, flammable and toxic liquids across the following industries:
- Chemical industry: acids, alkalis, solvents, suspensions and dispersions.
- Petroleum industry: oil pumping, heavy oil, grease, sludge and mud transfer.
- Coating industry: resins, solvents, colorants and paints.
- Food & beverage: semi-fluids such as chocolate, brine, vinegar, syrup, vegetable/soybean/animal oil and honey; yeast, concentrates, wine, fruit juice and corn syrup.
- Daily chemicals & pharmaceutical: detergents, shampoos, emulsions, creams and surfactants; solvents, acids and alkalis, botanical extracts, ointments and plasma.
- Ceramics industry: clay slip, porcelain slurry and lime slurry.
- Mining & water treatment: coal slurry, mortar, explosive slurry and lubricating oil; lime slurry, soft sediment, waste water and chemicals.
- Electronics industry: solvents, plating solutions, cleaning liquids, sulfuric and nitric acid, corrosive acids and polishing liquids.
- Textile industry: dye chemicals, resins and adhesives.
- Construction industry: cement slurry, tile mortar, rock slurry and ceiling compound.
- Automotive & furniture: polishing emulsion, oil, coolant, cleaning liquid, topcoat, varnish additives and degreasing liquid; adhesives, varnish, PVA wood glue, epoxy resin and starch adhesives.
- Metallurgy: casting defoamers, metal slurry, hydroxide and carbonate slurries, wet scrubber slurry.
QBY3‑series runs on compressed air (0.3‑0.7 MPa supply), no electricity required. It is suitable for portable transfer and flammable‑hazard environments; flow and discharge pressure can be stepless adjusted by air‑supply pressure.
DBY motor‑driven series is selected when plant compressed‑air supply is unavailable. Note: QBY3 pneumatic and DBY electric pumps have different maximum head, suction‑lift and dry‑running limits. Check respective product pages for exact performance.
Ambient working temperature: 5‑65℃. Allowable media temperature depends on wetted diaphragm material.
Yes. Wide flow passages deliver good solid‑passing performance. Maximum allowable particle size and viscosity capacity vary according to pump model.
Pump body materials: cast iron, aluminium alloy, PP, stainless steel 304, 316, 316L, PTFE lining.
Diaphragm options: NBR, Neoprene, EPDM, Viton, PTFE.
Valve balls & seats: NBR, Neoprene, PTFE, 304 / 316L stainless steel.
No priming water is required for both series.
⚠️ Difference on dry‑running capability:
• QBY3 pneumatic diaphragm pump: short‑time dry‑running is permitted, but continuous long‑time dry‑running is prohibited.
• DBY electric diaphragm pump: dry‑running is strictly forbidden under any operating condition, it will cause rapid mechanical damage.
Some models can be submerged in media under proper configuration. Neither pump requires oil lubrication.
