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, and below are our major products.


Air Operated Diaphragm Pump

Self Priming Sewage Pump

DIN24255 Series End Suction Centrifugal Pump

ISO Centrifugal Pump

Double Suction Pump

Multistage Centrifugal Pump

Mixed-Flow Pump and Axial Flow Pump

Diesel Engine and Complete Sets Of Equipment


This website focuses on our company's Air Operated Diaphragm Pump. Our air operated diaphragm pump adopts guided air valve, with features of stable operation, idling operation, explosion-proof safety, good corrosion resistance. And there are multi-material and multi-specification available, and the product is suitable for fluid transportation and self-priming function can be achieved by all of the products.


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.


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.


Main Certificate

Business license

Import and Export License Certificate

ISO9001 Certificate

CE Certificate (For Diaphragm Pump)

CE Certificate (For Centrifugal Pump)

Zhejiang Science and Technology SME Certificate

Utility model patent certificate

CNAS Certificate

DEFU History

In 2002,Y&L Pump Factory was founded,  production of JT&JU series non clogging self-priming sewage pump.

In 2004,SELE Pump Factory was founded, mainly produces DA series end suction centrifugal pump, this series of pumps is the same kind as KSB’s Kentlo pump, and it conforms to the European standard DIN 24255.

In 2005,We have passed ISO9001: 2008 Quality Management System Certification

In 2006,We began to develop and produce ISO2858 series chemical pumps and oil pumps

From 2007 to 2011, we successively put into production the air operated diaphragm pump, multistage pump, double suction pump, and diesel engine pump complete series.

In 2012, founded Wenzhou Defu Machinery Co., Ltd. established an international sales team and a professional sales team.

In 2018, the E-CORNELL PUMP company was established, focusing on the production of complete sets of diesel pumps and sewage pumps.

In 2021, JIUJIANG SELE (DEFU) FIRE was founded.

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