Company — YOUSUN International

Pohang branch

CEO greeting

Continuous innovation
drives the future
of industry

Welcome and thank you sincerely for visiting the YOUSUN International website.

Since our founding in 1999, YOUSUN International has provided high-quality solutions to industrial customers in Korea and overseas based on accumulated experience and technology in plant engineering, parts sales, valve maintenance and fabrication and plant equipment fabrication, installation and maintenance.

Based on official partnerships with leading global brands such as Baker Hughes, DMT and Qlar, we will continue to provide reliable products and dependable services while growing together as a trusted business partner for our customers.

CEO Hyun-Jeong Kweon

History

A record of technology and trust built over more than 20 years.

2024

Opened Ulsan branch

Established the Ulsan Branch near the petrochemical complex in Onsan-eup, Ulju-gun.

2024
~
2020

Consecutive Baker Hughes channel awards

Received the Baker Hughes channel award for five consecutive years.

2018

Hyun-Jeong Kweon appointed CEO

Began a new phase of growth under the newly appointed CEO.

Opened Dangjin branch

Entered the Dangjin steel industrial complex in Chungcheongnam-do and strengthened support for customers including Hyundai Steel.

2017

Expanded and relocated Pohang office & factory

Expanded and relocated the Pohang office and factory to the current Pohang 4th Industrial Complex.

2012

Achieved USD 2 million in exports

Achieved USD 2 million in exports through expansion into overseas markets.

2010

Relocated Pohang office & factory

Relocated the Pohang office and factory to Yeonil.

2004

Incorporated as YOUSUN International Co., Ltd.

Converted to YOUSUN International Co., Ltd.

2001

Opened Pohang office

Established an office near the POSCO steel complex to strengthen field responsiveness.

1999

Founded YOUSUN International

Established the Seoul headquarters.

Organization

We respond quickly and accurately to customer needs through a systematic organization.

CEO

Management support

Finance · HR · Administration

Sales

Parts Sales · Orders

Engineering

Engineering · Design

Maintenance

Field Installation · Maintenance

R&D center

Corporate R&D

Achievements

Track record

Explore the trust and technical capability we have built across major industrial sites in Korea. Hover over each card to view detailed records.

Valve

EPC projects

Supply records of Control Valves and PRV/PSV for offshore, petrochemical and power projects.

Baker Hughes · EPC supply

EPC project records

YearProject nameEnd userEPC contractorProject typeCountry of siteItem

2025FGSS / MAWEI EPS 5500 PCTCEPSDonghwa EntecOffshoreChina shipyardCV

2024FGSS / EPS 7000 PCTC FGSSEPSDonham entecOffshoreChina shipyardCV

2023Bulk carrier / H-line EPSEPSDonghwa EntecOffshoreChina shipyardCV

2022Line wp2&3Lotte chemicalLotte e&cPetrochemicalIndonesiaCV/PRV

2021G1Lotte chemicalLotte e&cPetrochemicalKoreaCV

2019RiauMrprLotte e&cPowerIndonesiaCV

2018Jg summit stage 1 expansionJg summitPOSCO E&CPetrochemicalPhilippinesCV/PSV/PRV

2016Lake charles chemicalsSasolToyo engineeringPetrochemicalUsaCV

Power & nuclear

Nuclear & conventional power plants

Supply records for nuclear and conventional power plant projects.

KHNP · power plant

Nuclear & conventional power plants

YearCustomerCount

2024~2005KHNP uljin nuclear power plant20 Cases

2024~2006KHNP wolsong nuclear power plant21 Cases

2024~2020KHNP saeul nuclear power headquarters13 Cases

KHNP hanbit nuclear power headquarters2 Cases

2024~2022Yeongdong eco power headquarters2 Cases

2022Seoul energy corporation1 Case

2022~2017KHNP hanul nuclear power plant4 Cases

2021~2020Korea east-west power Dangjin power headquarters2 Cases

2019Yeongheung thermal power plant1 Case

2019~2013Korea midland power4 Cases

2018Kepco kps hanul1 Case

2017Kepco kps boryeong1 Case

2013Korea south-east power1 Case

Korea east-west power1 Case

2013~2011KHNP kori nuclear power plant2 Cases

2009KHNP yeonggwang nuclear power plant1 Case

Steel equipment

Moving machine & plant facilities

Records of steel plant core equipment fabrication and installation and moving machine improvement and maintenance.

POSCO & Hyundai Steel · Pohang / Dangjin

Moving machine

YearProject nameContract / end user

2026Coke no.3 pusher air compressor replacementHyundai Steel

2025Coke ecs fume duct grizzly bar and belt replacementHyundai Steel

Coke mobile car repair workHyundai Steel

Mobile car grease system distributor valve and piping replacementHyundai Steel

Coke mobile car repair workHyundai Steel

2024Pusher air compressor replacementHyundai Steel

By-product plant maintenance_mobile car axial fan replacementHyundai Steel

Coke mobile car repair workHyundai Steel

2022No.3 coke mobile car coke guide channel replacementHyundai Steel

2021Quenching car dewatering valve fabricationHyundai Steel

Coke pusher car #5 bogie cross beam replacement workHyundai Steel

Coke mobile car no.6 door extractor replacementHyundai Steel

2020No.3 charging car telescope improvementHyundai Steel

Transfer car #1 coke guide wheel replacementHyundai Steel

Transfer car #3 door extractor, door cleaner and frame cleaner replacementHyundai Steel

Plant facilities

YearProject nameContract / end user

2025Pohang no.6 coke new moving machine improvementPlanttech / POSCO

Pohang steelmaking no.2 bof ferroalloy tripper car fabrication contractPlanttech / POSCO

Pohang steelmaking no.3 bof no.1 slopping chute fabricationPlanttech / POSCO

2023Pohang blast furnace no.4 2nd revamp pci dust collector fabricationPlanttech / POSCO

Pohang steelmaking no.3 bof no.2 slopping chute fabricationBhi / POSCO

2020Pohang sintering nox removal equipment fabrication and installationDaeju machinery / POSCO

2019Gwangyang blast furnace no.3 granulation tower fabrication

Pohang blast furnace no.3 cast house damper fabricationPOSCO E&C / POSCO

Dangjin pgc tube replacement workHyundai Steel

Pohang sts steelmaking no.1 turning devicePlanttech / POSCO

2018Pohang coke oven mixed combustion facility ductPlanttech / POSCO

2016Nssmc kashima works coke valve 138 sets fabricationPaul wurth

2015Bhushan power & steel limited coke valve 638 sets fabricationPaul wurth

2013Csp pecem coke valve 616 sets fabricationPaul wurth

2012Pt. krakatau POSCO coke valve 522 sets fabricationPaul wurth

Refinery

S-Oil refinery & petrochemical

Baker Hughes Control and Safety Valve Supply

S-Oil · Ulsan

S-Oil refinery & petrochemical

2026
Ruc no.6 facility turnaround material supplyOdc facility turnaround material supply1Px, 1aro and refinery team 2 facility turnaround material supply#2Rhds control valve supply
2025
#2Rfcc bfw control valve supply1Px and 1aro aged valve improvement supplyPst hmi system supply1Px pressure regulator supply

Plant engineering

Global plant engineering & equipment

Engineering and equipment supply for coke plants, GTP desulfurization facilities, Finex, HyRex and power generation control systems.

POSCO · global steel plants · komipo

Global plant engineering & equipment

2026
POSCO hyrex demo pneumatic conveying system supply contract (Qlar)
2023
POSCO gwangyang gtp 1 & 2 chiller systems engineering review (DMT)
2021
POSCO Pohang gtp 1, 2 & 3 revamping (DMT)
2017
Komipo jeju gt unit 3 turbine generator control system upgrade (ethosenergy)
2014
POSCO 3finex pneumatic conveying system contract (clyde)Brazil csp integrated steel mill coke plant supply (pwit & DMT)Indonesia integrated steel mill coke plant supply (pwit & DMT)
2008
Poshimetal ulpc – lf and shf supply (tenova pyromet)Poshimetal femn plant electrical equipment supply (tenova pyromet)
2005
POSCO finex 1.5mt CO2 removal PSA unit supply contract (uop)
2004
Supply of four POSCO gwangyang and Pohang desulfurization units (DMT)POSCO finex plants 1 and 2 pneumatic conveying system contract (clyde)
2002
POSCO Pohang 1st, 2nd and 4-2nd desulfurization facility supply contract (DMT)
2001
Wolsong nuclear power plant heavy water supply contract (raan)
2000
POSCO Pohang 4-2 desulfurization facility supply contract (steiner)

Valve service

Valve repair & maintenance

Maintenance and repair records for Control Valves, Actuators and Positioners in power, steel and energy plants.

Donghwa Entec · POSCO Future M · power plants · steel mills

Valve repair & maintenance records by customer

Donghwa Entec

2023~2026Over 3,000 site commissioning & repair cases

POSCO Future M

2026POSCO Future M valve repair unit-price contract
2022~2023POSCO Future M valve repair unit-price contract

KOSPO

2024South jeju power · comflex 2 valve ball seat ring replacement
2023South jeju power · comflex 2 valve diaphragm replacement
2015South jeju power · #2 svi2 positioner replacement & performent improvement
2014South jeju power · #1 svi2 positioner replacement & performent improvement

East-West power

2021Iisan thermal power · #5,6 c/v actuator inspection & diaphragm replacement
2021IIsan Thermal power · #5 HRSG Positioner model change & installation
2021Honam power · #1 C/V actuator inspection & Diaphragm replacement
2020Iisan thermal power · #2 hrsg c/v, actuator inspection & diaphragm replacement
2020IIsan Thermal power · #1 HRSG C/V, Actuator inspection & diaphragm replacement
2017Ilsan thermal power · unit 2 4700 positioner replacement
2016Ilsan thermal power · unit 2 actuator positioner replacement & performance improvement
2015Iisan thermal power · #1~5 hrsg level transmitter, positioner replacement
2015Boryeong power · #1 Actuator overhaul & Positioner calibration
2014Honam power · unit 2 svi2 positioner replacement & performance improvement
2013Ilsan thermal power · unit 2 c/v diaphragm replacement

KOMIPO

2019Boryeong power · #2 tbn site CV actuator inspection
2019Boryeong power · #1,2 sulfur removal FCV positioner installation
2019Boryeong power · #1,2 Remote Positioner senor installation
2017Boryeong power · #2 actuator overhaul & positioner calibration
2015Boryeong power · #1 actuator overhaul & positioner calibration

Koenergy

2022Yeoungheung power · #1,2 tbn c/v diaphragm replacement
2020Yeoungheung power · #4 turbine ventilator vv & ip cooling stm vv actuator overhaul
2019Yeoungheung power · #5 turbine ventilator vv & ip cooling stm vv actuator overhaul
2018Yeoungheung power · #6 turbine ventilator vv & ip cooling stm vv actuator overhaul
2018Yeosu power · #2 Min Flow C/V 37 Actuator overhaul
2018Yeoungdong power · #1 TBN C/V inspection
2017Yeoungdong power · #1,2 nakakita c/v diaphragm replacement
2015Yeoungdong power · #2 tbn seal steam control system installation
2013Yeoungdong power · #1 tbn seal steam control system installation