Gaskets in Weldless Ball Valve for Kettle

I'm looking to drill a hole and add a stainless steel ball valve to my brew kettle (tired of hefting that thing around). I'm wondering what the constant heat does to the seal of the gaskets. Has anyone had any issues? You figure with the flame in such close proximity and the heat from the boiling wort that the gaskets would break down, causing leakage were the ball valve assembly comes through the kettle wall. Any thoughts? Thanks.

All of these seals are silicone, and hold up to extremely high temps.

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Primary- Circle City Haus Ale
Secondary- Orange Cascade APA (dry hop)
Keg1- Centennial Blonde (On tap)
Keg2- Oktoberfest (On tap)
Keg3- Christmas Spice
Keg4- Fire In The Hole
Keg5- AIR
Keg6- AIR
Keg7- AIR
Keg8- AIR