About us

It is my great pleasure to greet our respectful customers through this site.
We are thank you very much for your higher attention and amicable co-operation to us.
We hope it could be useful for you to understand and have information more about our company and products.
Since incorporated in 1976, SEWON INDUSTRIES CO., LTD. have developed various type of expansion joints, venting devices & safety devices and achieved relative international certifications on some products.
Now, our products are approved by the world-wide famous ship classification societies such as CE, ABS, BV, DNV, KR, LR, NK, RINA, USCG and have already listed in nuclear power plant as qualified manufacturer.
SEWON have supplied not only its high quality products to the various industries of Shipbuilding, Heavy machinery, Petro-chemical industries and nuclear power plant but also provides technical solutions to the needs of clients.
SEWON will strive to become the Global Leader In Marine Equipment through continuous corporate restructuring technology and development.
Once again, we so much appreciated your continuous co-operation rendered so far.

Sincerely yours,
Wang-gun Jeon
1976. 12
Established Korea vessel rigging company  
1978. 06
Sliding type couplings are developed  
1979. 05
Changed company's name to SEWON industries company
1980. 05
Sleeve type couplings are developed  
1982. 06
Air vent heads are developed  
1984. 09
Mineralizer (Rehardening Filter) are developed
1985. 07
Bellows type expansion joints are developed  
1988. 10
Non-metallic expansion joints are developed
1989. 06
SEWON QA system is approved by nuclear power plants for bellows type expansion joint & flexible metal hose  
1990. 05
Deflagration and Detonation type flame arresters are developed  
1993. 09
Factory was moved & expanded to Jungkwan, Kijang, Busan  
1994. 02
Computerized flow test equipment (max. Capacity=14000㎥/h at 4000mmH2O) & endurance burning test equipment are fully installed at SEWON laboratory
1999. 04
ISO 9001 certificate was approved by DNV  
1999. 05
Acquired the wheel mark (C.E mark) certificate for cargo tank venting devices.
1999. 09
Water flow test equipment is installed at sewon laboratory.  
2000. 01
New high velocity pressure vacuum valves are developed.  
2004. 01
Ice chamber for -40 ° C is installed at sewon laboratory.
2004. 02
Ice class type P/V valve & Air Vent Head are developed.  
2008. 02
Factory is moved & expanded to Hwangsa-ri, Beopsu-myeon, Gyeongsangnam-do.  
2009. 07
Established SEWON laboratory.  
Robotic welding machine was installed at SE-WON company to make AVH.  
2012. 03
New type of AVH was developed.  
2015. 02
Anti-splash devices were developed.  
2017. 03
Acquired the ATEX (Ex e II T4, IP66) certificate for AVH heating type.
2017. 12
HV1 type High Velocity P/V Valves are developed.  
2019. 10
DTRO (Reverse osmosis equipment) are developed.  
2020. 11
VOCON  valves are developed.  
Contact us
Rep. tel. : +82-55-580-7200
59 Hwangsagongdan-ro Beopsu-myeon Haman-gun Gyeongsangnam-do (52055) KOREA


Tel) 580-7200~6,11
Fax) 580-7220


Tel) 580-7221~5
Fax) 580-7240


Tel) 580-7241~3
Fax) 580-7250


Tel) 580-7251~3,7261~2
Fax) 580-7260


Tel) 580-7271~2
Fax) 580-7280