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Old 1st Apr 2019, 8:52 pm   #11
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: Refixing loose valve bases

Please do not use 'Super Glue' type adhesives to bond valve bases!! It is a fantastic bonding agent but not for delicate glass valves.

I have no knowledge of the chemical reaction but it appears to dissolve an area of the glass resulting in fracture.I have good proof of this.

My own method is to purchase a cheap two tube type adhesive at the pound shop. After mixing, force it into the space between the base and the bottom of the glass bulb. Damp a cloth and while turning the valve, wipe off any excess producing a clean smooth finish. To complete, for a period of a few hours, stretch an elastic band around the bulb and under the base to hold it in mild compression.

Cheap epoxy is ideal as it does not set so absolutely solid as the real stuff does. I have never experienced any problems what so ever.

NEVER USE 'SUPER GLUE TYPE bonding agents. They will crack with time. John.
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