Printable View
Patching a broken valve.
<video controls autoplay loop> <source src="https://diqn32j8nouaz.cloudfront.net/broken_valve_repair_seal.mp4" type="video/mp4"> Your browser does not support the video tag. </video>
Previously:
https://www.homemadetools.net/forum/...880#post171413
https://www.homemadetools.net/forum/...240#post180821
https://www.homemadetools.net/forum/...069#post184235
https://www.homemadetools.net/forum/...434#post173615
https://www.homemadetools.net/forum/...994#post156992
Looks suspiciously like JB Weld, although I think someone is being a bit disingenuous with the drill and hammer.
Yes it does look like JB weld but many 2 part epoxies look the same. One thing I noticed was his lack of proper surface preparation. You never want to rely on the bond between paint and metal or epoxy on paint to achieve ultimate bond strength,Quote:
Originally Posted by nova_robotics
It's load bearing paint.Quote:
Originally Posted by Frank S
I suppose, since he acted like he couldn't even drill through the stuff either.Quote:
Originally Posted by nova_robotics
How long is that going to last? Would you want to go away for the weekend hoping not to come home to a house full of water. With plumbing do it once and do it properly. For the sake of a few dollars for a new fitting which is about how much the JB weld costs.
The taper the insert is laid against does not supply any support, nor is there any adhesive to set the insert to the body. I just cannot see how that would hold under any pressure.
Whare can I find me some of that there load bearing paint? hahaha
Really, though, would even powder coat offer any load bearing?
JB weld is some pretty amazing stuff, but I wouldn't trust it in this case as Bony says. However those valves aren't cheap.
Well JB Weld isn't the only 2-part fixer. The undisputed king of the field are product of Belzona https://www.belzona.com
These compounds were in common use at the pump shop. Pump builds destined for severe use, got interior treatment of Scotch Coat that can only be removed fully by industrial oven.
We used a lot of Belzona in the caterpillar rebuild shop I worked at for 5 years makes JB weld look like hardened silly puttyQuote:
Originally Posted by Toolmaker51
Not to mention the next time they try to open or close that valve and then discover some of the epoxy seeped through. That won't be much fun.Quote:
Originally Posted by Frank S
I started using Belzona in 1978 in the power industry for repairing stuff, biggest job that established them in the UK was the Hinkley Point 'B' power stations sea water cooling butterfly valves, originally designed as shutoff valves they had been used operationally as variable modulating throttle valves and suffered significant erosion of the butterfly and the body as a result. Machining off ~ 1 to 2" of surface, rebuilding with Belzona and re-machining to original spec enabled them to last much longer without significant erosive damage/wear. I still use Belzona at work, repairing Process Cooling Water system parts on high vacuum sputtering machines, again machining away the eroded/corroded metal, rebuilding with Belzona and refinishing when spare parts have a 6-9 months lead time and will suffer similar problems inside 2 years, the repaired parts are still good and in use 4 years later.
JBWeld isn't quite Belzona, but still useful, my F658GS suffered the usual BMW F800 leaking oil/water heat exchanger problem due to corrosion creeping under the seals, machined off the worst, grit blasted the rest to remove deeper corrosion and form a key then rebuilt with JB, machined it flat then top flat skimmed with JB simply to fill any exposed opened bubbles from mixing first batch, polished on crocus paper to finish, a lot cheaper than a new one at £130 and with that epoxy surface never likely to corrode again.