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Air operated double diaphragm pumps (also know as AODD, AODDP, Diaphragm pumps & Membrane pumps) are widely used for pumping all kinds of liquids. The feature include: high pressure, air powered, self priming, ATEX rated, reliability, dry running, etc. 

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Defu Machinery dedicating to undertaking of pump
Our company has perfect quality system, advanced testing means, and has passed the quality management system (ISO9001:2015), CE certification and so on. We adhere to pre-factory inspection, performance up to the standard before export.
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With features of stable operation, idling operation, explosion-proof safety, good corrosion resistance.
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A professional pump manufacturer integrating R&D, production and sales.
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About us

Founded in 2012, Wenzhou Defu Machinery Co., Ltd. is a professional pump manufacturer integrating R&D, production and sales.

Defu Machinery, dedicating to undertaking of pump. Our company focuses on the application research of pumps and complete sets of equipment, and provides users with technical solutions based on the principle that the pump which is suitable is a good one. Now we have 3 manufacturing plants including SELE PUMP , YL PUMP & E-CORNELL PUMP. We will continue to focus on improving the quality of water pumps, improving pump efficiency, reducing user costs, and working towards a more energy-efficient and environmentally friendly direction.
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隔膜泵的CE 认证
Zhejiang Science and Technology SME Certificate
Utility model patent certificate
TUV Inspection Report (1)
ISO9001 Certificate
Import and Export License Certificate
DEFU Business License
CNAS Cert-1
NEW CE CERTIFICATE IN 2018
Case Studies
Diaphragm pump or double diaphragm pump (air pump, air diaphragm pump) is a kind of positive displacement pumps which suitable for corrosive , volatile, flammable, poisonous fluids with particles and high viscosity chemical liquid.Such as suck acid, alkali and corrosive liquid , paint, glue and adhesive, waste water and cement slurry, diesel oil and gasoline etc.
Pneumatic diaphragm pump with sectional type structure, this self -priming pump can be used for conveying two different liquid by double diaphragm. Here we have a list of some pneumatic pump cases to show some application.
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  • Chemical Industry Diaphragm Pump
  • Daily Chemical Industry AODD Pump
  • More than 100units Air Pumps Delivered
  • Air Membrane Pump Used In Explosion-proof Area
  • Food Grade Air Operated Pump
  • Metal Air Diaphragm Pump For Beer & Fruit etc
Our Advantage
We have professional team to provide full-service solution that can help you find right solution from start to finish. Our air operated diaphragm pump adopts guided air valve, with features of stable idling operation, explosion-proof safety, good corrosion resistance.
Easy Installation- Adjustable Direction of Pump Inlet & Outlet
Easy Installation- Adjustable Direction of Pump Inlet & Outlet
The diaphragm pump inlet & outlet direction can make in the middle or side port as customer’s demand. The inlet &outlet flange meet ANSI standard, whatever your pipeline had been installed or not, you can choose the suitable type as required with easy installation.  
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Double Diaphragm Pump
Double Diaphragm Pump
With Good Sectional Type Structure & Self Priming Function The air membrane pump with sectional type structure ,can be used for conveying two different liquid by double diaphragm.   The air diaphragm pump has the function of self priming without rotating parts. It can achieve dry priming and wet priming, which self -priming height is 5m and 8m respectively. Our pump can be used direc...
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Flap Valve Diaphragm Pump –Handling Big Size Solids
Flap Valve Diaphragm Pump –Handling Big Size Solids
Defu’s Flap valve Air Operated Diaphragm Pump is designed to support passage of solids up to 40mm in diameter. Designed for durability in the field. •Top-suction / bottom-discharge design to easily handling of solid parts: the gravity force helps to keep clean the flap valves •Self priming and dry run ability without damage •Easy access to the flap valve (bolted cover valve fo...
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Full Stainless Steel Air Diaphragm Pump
Full Stainless Steel Air Diaphragm Pump
Without electricity, explosion-proof, can convey flammable fluid. No dynamic seals, even dry running without damage to the pump. No impeller, low shear, will not damage the material structure of fluid. Submersible, mobile, flexible installation, easy maintenance. Can convey high-thick, high-viscosity fluid. Can convey acid, alkali, strong organic solvents and other fluid. Changing the inlet air an...
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Our Services (Pre-sale to After-sale)
Our Services (Pre-sale to After-sale)
Pre-sales Service: According to your requirement, we will give you our profession advice of pump solution. Please advise your specific pumping medium, flow rate or size etc. On-sales Service: We will clearly show you everything in fact when you place an order with us. We will takes photos or videos to show you our production situation. After-sales Service: We will full report y...
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24-hour Service Hotline : +86-18957752760

  • Address : No.9, Wenhui Road, Puzhou Street, Longwan District, Wenzhou, Zhejiang, China

  • Email : sales9@defupump.com

  • WhatsApp : +86-18957752760

  • Contact Person (Charger) : Ms Cindy

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