Valve Stelliting
Valve Stelliting
(OP)
SUB: Stelliting for valves (Gate, Globe &check)
why we go for seat & trim stellite ?
what are the conditions & what are the reasons for going stellite.
why we go for seat & trim stellite ?
what are the conditions & what are the reasons for going stellite.





RE: Valve Stelliting
RE: Valve Stelliting
For abrasive conditions, such as a lot of solids like sand, an alternative to going hard is to go soft (yup, I was surprised too). Evidently, if you go to a soft internal valve, such as a pinch valve, the solids doesn't really affect the soft stuff. Sort of think of car tires on asphalt. It takes a lot of wear.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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RE: Valve Stelliting
Many severe services like high pressure boilder feed water require hard-facing. Some applications where alloy 6 is applied do not appear severe. An example of a severe service may be a small sour water drain valve on level control. If the level control just cracks the plug off the seat there may be a very high velocity between the plug and seat that will "wire-draw" a groove in the plug. Gap-acting control or other control methods to prevent the valve operating near the seat is also helpful to prevent such erosion.
RE: Valve Stelliting
The primary purpose of the stellite overlay however, is for hardness to combat mechanical wear.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada