This is a relatively new type of pump that utilizes compressed air as its power source to drive operation. To meet diverse application requirements, the pump body and diaphragms are available in a variety of materials; pump bodies can be made of cast iron, aluminum alloy, stainless steel, or engineering plastics, while diaphragms are available in materials such as nitrile rubber, fluoroelastomer (FKM), PTFE, and F46. These pumps are suitable for a wide range of industries, including construction, food processing, petroleum, chemicals, electronics, ceramics, textiles, and paint manufacturing. Notably, the HY-series pneumatic diaphragm pump—independently developed by Shanghai Shenyin Pump Manufacturing Co., Ltd. based on imported models—offers a service life several times longer than that of the domestic QBY-series pumps. Today, the pump experts at Shanghai Shenyin Pump Manufacturing Co., Ltd. will outline the product features, advantages, and technical specifications of these common pneumatic diaphragm pumps.
1. Product Features: Pneumatic diaphragm pumps are available in eight different port sizes: 3/8" (DN10), 1/2" (DN15), 1" (DN25), 1.5" (DN40), 2" (DN50), 3" (DN80), and 4" (DN100). Pump body materials include cast iron, 304 stainless steel, 316 stainless steel, PP, and PVDF. Diaphragm materials are selected based on the specific liquid medium and include nitrile rubber, neoprene, fluoroelastomer (FKM), PTFE, Santoprene (TPV), and polyether elastomer. These pumps are suitable for a wide range of industrial applications. 2. Advantages of Pneumatic Diaphragm Pumps: These pumps can handle both free-flowing liquids and viscous media, combining the benefits of self-priming pumps, submersible pumps, slurry pumps, and sewage pumps:
1. No priming required; suction lift up to 8.4m, discharge head up to 84m, and outlet pressure ≥ 8 kg/cm²;
2. Wide flow passages and excellent solids-handling capability (allowing particles up to 10mm in diameter); minimal wear when pumping slurries or fluids containing impurities;
3. Discharge head and flow rate can be infinitely adjusted by regulating the air valve opening;
4. No rotating parts or shaft seals; the diaphragm completely isolates the pumped medium from the pump's moving parts, preventing external leakage. This ensures safety for personnel and the environment when handling toxic, volatile, or corrosive media;
5. No electricity required; safe and reliable for use in flammable or explosive environments;
6. Can operate while submerged in the medium;
7. Simple operation and high reliability; start/stop is controlled simply by opening or closing the air valve. The pump is not damaged by prolonged dry running or sudden shutdowns due to accidents; it features automatic overload protection (stopping when overloaded and restarting automatically once the load returns to normal);
8. Simple structure with few wearing parts; easy installation and maintenance. The pumped medium does not come into contact with moving parts like the directional valve or connecting rods, avoiding the gradual performance degradation seen in pumps relying on rotors, pistons, gears, or vanes;
9. Capable of pumping viscous liquids (viscosity up to 8,000 cP);
10. No oil lubrication required; dry running causes no damage to the pump—a key feature of this design.
III. Technical Specifications for Pneumatic Diaphragm Pumps
Flow rate: 0–1060 L/min
Max. particle diameter: 0–9.4 mm
Head: 0–84 m
Port size: 6–100 mm
Temperature: -15 to +150°C
Pressure: 0.1–0.7 MPa
Suction lift: 5–7 m
We hope the information above has provided you with valuable insights regarding the product features, advantages, and technical specifications of common pneumatic diaphragm pumps.