Sanitary diaphragm pumps are classified into multiple mainstream series based on driving method, structural design, material & certification, and application scenarios. They are widely used in clean/sterile working conditions such as food, pharmaceutical, daily chemical, and bioengineering industries.
I. Classification by Driving Method (Most Common)
1. Pneumatic Sanitary Diaphragm Pumps (AODD)
Core Features: Compressed air-driven, no motor required, dry-run capable, strong self-priming, explosion-proof, adjustable flow rate, easy to clean.
Mainstream Series:
Shanghai Zhilong QBY Pneumatic Diaphragm Pump
Graco SaniForce Sanitary Pneumatic Double Diaphragm Pumps (316L, FDA, 3A, EHEDG certified)
Tapflo Sanitary Pneumatic Diaphragm Pumps (316L, quick-clamp connection, no dead corners)
Bianfeng Q/DBW3 Sanitary Pneumatic Series (mirror polishing, quick-clamp disassembly)
Bote BR Sanitary Pneumatic Series (316L, PTFE diaphragm, ATEX explosion-proof)
Debem AISIBOXER Sanitary Pneumatic Series (316L, Tri-Clamp connection, anti-cavitation)
Typical Caliber: DN15/25/40/50 (1/2"~2"), flow rate 10~1000 L/min
Applications: Food and beverage, pharmaceutical batching, daily chemicals, high-viscosity/particle-containing/shear-sensitive materials.
2. Electric Sanitary Diaphragm Pumps (EODD)
Core Features: Motor-driven, energy-saving, low-noise, stable flow rate, precise metering capability, suitable for continuous conveying.
Mainstream Series:
Shanghai Zhilong DBY Electric Diaphragm Pump
Graco QUANTM Sanitary Electric Double Diaphragm Pumps (frequency conversion, energy-saving, low pulsation)
Bianfeng DBW3B Electric Sanitary Series (316L, explosion-proof motor, DN25/40)
LEWA ecodos/ecoflow Sanitary Electric Diaphragm Metering Pumps (high precision, high pressure, sterile)
Applications: Pharmaceutical injections, biological agents, fine chemicals, sanitary scenarios requiring precise metering.
3. Hydraulic-Driven Sanitary Diaphragm Pumps
Core Features: Hydraulic-driven, high pressure (up to several hundred bar), large flow rate, extremely high stability.
Mainstream Series:
LEWA triplex Sanitary Hydraulic Diaphragm Pumps (high pressure, sterile, homogenizing)
Applications: Pharmaceutical high-pressure sterilization, biological fermentation, sterile conveying of high-viscosity/high-solid-content materials.
II. Classification by Structure and Sanitary Level
1. Standard Sanitary Level (Food/General Pharmaceutical)
Design: 316L mirror polishing (Ra≤0.8μm), quick-clamp connection, no dead corners, easy for CIP/SIP (Cleaning In Place/Sterilization In Place).
Certifications: FDA, 3A, GMP, ROHS
Representatives: Graco SaniForce, Tapflo Sanitary Pneumatic, Bianfeng DBW3 Series.
2. Sterile/Pharmaceutical Level (Biological/Injection)
Design: Full flow channel, no retention, steam sterilizable (SIP), double diaphragm + rupture detection, EHEDG certified.
Representatives: LEWA ecoflow, Graco SaniForce Sterile Version, Tapflo EHEDG Sterile Pumps.
3. Sanitary Metering Type (Precise Dosing/Batching)
Design: Mechanical/hydraulic diaphragm, metering accuracy ±1%~±2%, remote controllable, modular design.
Representatives: LEWA ecodos, Nanfang Pump Industry GW/GS Sanitary Metering Series.
III. Classification by Material and Contact Parts
316L Stainless Steel (Mainstream): Suitable for food, pharmaceutical, neutral/weakly corrosive media.
316Ti/Super Austenitic Stainless Steel: Suitable for strong corrosion and high cleanliness requirements.
Diaphragm Materials:
PTFE (Teflon): Chemical-resistant, high-temperature resistant, FDA certified.
EPDM/Fluoroelastomer: Food-grade, good elasticity, temperature-resistant.
Double-layer Composite Diaphragm (PTFE + Rubber): Balances sanitation and service life.
Seals: Food-grade silicone rubber, EPDM, PTFE.
IV. Mainstream Brands and Representative Models (Domestic + International)
International Brands
Graco: SaniForce 1040/1590/2150 Sanitary Pneumatic; QUANTM Electric Sanitary.
LEWA: ecodos Sanitary Metering, ecoflow Sanitary High Pressure, triplex Sterile Hydraulic.
Tapflo: Sanitary Pneumatic Series, EHEDG Sterile Pumps.
Debem: AISIBOXER Sanitary Pneumatic Series.
Domestic Brands
Bianfeng (Gude): Q/DBW3 Sanitary Pneumatic, DBW3B Electric Sanitary.
Bote Pump Industry: BR Sanitary Pneumatic Series.
Nanfang Pump Industry: GW/GS Sanitary Metering Series.
Shanghai Yangguang/Shanghai Bianfeng: Sanitary Pneumatic/Electric Diaphragm Pumps.
V. Key Selection Points (Quick Judgment)
Driving Method: Pneumatic (explosion-proof/dry-run), Electric (energy-saving/metering), Hydraulic (high pressure).
Sanitary Level: Food (FDA/3A), Pharmaceutical (GMP/EHEDG), Sterile (SIP/CIP).
Flow Rate/Pressure: 0.1~1000 L/min, 0.2~10 bar (pneumatic); metering pumps can reach 500 bar+.
Connections: Tri-Clamp (quick-fit), DIN, SMS, RJT.
Materials: 316L + PTFE/EPDM (general); Hastelloy/titanium for special working conditions.
VI. Typical Application Scenarios
Food and Beverage: Dairy products, fruit juice, sauces, syrup, beer, edible oil.
Pharmaceuticals: Liquid medicines, injections, biological agents, vaccines, ointments.
Daily Chemicals: Cosmetics, toothpaste, shampoo, detergents.
Bioengineering: Fermentation broth, cell culture fluid, sterile water.
