Special Maintenance List
Defects which haveoccurred on the stellite part of the valve seat such as wear, cracks, and erosion can cause leakage.
Low cost and short-term restoration vs. Valve Body replacement.
How to Repair
Repair with cutting and welding machines on site.
1.Separate the valve seat from the body by scraping the welded part using a cutting machine.
2.Mount the new valve seat by a welding machine.
Scope
Globe Valve,Gate Valve,Check Valve
Work Period
9 days (Standard number of days)
< Examples >
Before
After
For emergency, perform a local repair. (Emergency Treatment)
How to Repair
Perform a local repair by manual welding method.
Scope
Globe Valve,Gate Valve,Check Valve [ Valve Seat,Valve Disc ]
Work Period
3 days (Standard number of days)
* The valve disc or body will be replaced at the next inspection as it is an emergency treatment.
< Examples (Valve Disc) >
Overlay Welding
Grind the
welded part
PT
(Liquid Penetrant Testing)
after grinding
