This document summarizes the history and operations of Nsen Valve Co., Ltd., a Chinese manufacturer of butterfly valves. It outlines that the company was established in 1983 and has since expanded its product lines, received certifications, and developed new technologies. Notable events include being granted a national patent for its bi-directional metal seated butterfly valve in 1997 and being awarded a technology center designation in 2010. The company produces butterfly valves from 50mm to 3600mm in size and 150-1500 pressure classes for various industrial applications.

1. Brief Introductoin
of

2. History
 1983，Mr Dong establish Yongjia Valve Factory who specially product butterfly valve.
 1988，Nsen expand the product ball valve, safety valve.
 1993，Nsen cut the safety valve production. Focusing on Butterfly valve and ball valve.
 1997，Nsen cut the Ball valve，focusing on development of butterfly valve. Not so far our”Bi-
directional metal seated butterfly valve”been granted the invention patents by national
 2002，Nsen got ISO 9001 certified. Our “Bi-directional metal seated butterfly valve” was listed as
a national key new product by the state economic and trade commission, at the same time it
chosen in <<World outstanding patent technology selection>>.
 2010，Nsen was awarded Zhejiang Enterprise Technology Center for butterfly valve
 2013，Nsen start to produce high pressure butterfly valve（ Class 1500）
 2014 ，The largest size we could product reach DN3200 / 128”

3. Our old factory photo

4. Company Facts
• Established in 1983
• Registered capital 1 million RMB
• Factory area of 3700 square meters,
• More than 20 senior & semi-senior technicians
• About 62 workers

5. Board of Directors
Chairman of Board
General Manager
Administrative
Director
Finance Director
Production
Manager
Technical
Manager
Marketing and Sales
Manager
Quality Control
Manager
Trade Union
Administration
Department
Human Resources
Department
Trade Union
Finance
Department
Accounting
Department
Production
Department
Division of
Material Supplying
Technology
Department
Research and
Development Dept
International
Department
Planning
Department
Marketing
Department
Sales Department
Quality Control
Department
After-sale Service
Department
Quality Testing
Department

6. Certifications

7. National Pateny for Butterfly Valve

8. Overview of fatory

9. Connection type
Wafer type
Butt weld type Double flanged type
Lug type

10. Main valve type
Triple-Eccentric Metal Hard Seal
Butterfly Valve
Full Metal-Seated Bi-Directional
Butterfly Valve
Resistant Seawater Butterfly Valve

11. Triple-Eccentric Metal Seal
Butterfly Valve

12. Triple-Eccentric Metal Hard Seal
Butterfly Valve

13. Full Metal-Seated Bi-Directional
Butterfly Valve

14. Full Metal-Seated Bi-Directional
Butterfly Valve

15. Resistant Seawater Butterfly Valve

16.  Size：
DN50~DN3600(2”~144“)
 Pressure：
PN2.5~PN260（Class150~Class1500）
 Temperature range：
-46℃~600℃
 Different type has different range
Production range

17.  Structure of normal seat  Structure of NSEN seat

18.  Non-Friction design for sealing
 Bi-diretional sealing Zero Leakage
 Highest pressure 600LB for bi-diretonal sealing
 Long servicing life, low maintain charge
 Replaceable seat and sealing for on-site service;
 Valve can be used safely in complex conditions,
like high temperature/pressure etc
 Mature technology for metal seated bi-
directional sealing butterfly valve
Our Adventage

19. Progress of Production
Casting Heat Treatment Chemical Analysis&
Mechanical properties
Casting Arrival Check
Rough machining Shot blasting Finish machining Machining Dimension
Check

20. Progress of Production
Assembly Final Dimension check Pressure Test Cleaning&Surface
finishing
Painting Packing Shipment

21. • Other Raw Material Test

22. Butterfly valve for
Seawater Desalination
system

23. Class 150LB 54”
Flange type Pneumatic Butterfly valve

24. DN2200 1.0MPa
Electric butterfly valve

25. Penumatic butterfly valve in
aluminium bronze

26. Contact information
ADD: Dongou Industrial Zone, Oubei town, Wenzhou,
Zhejiang, China
TEL: +86 577 67962777
FAX: +86 577 67962777
Web: www.nsen.cn
www.naisen.com
Email: info@nsen.cn