How to remove stone from rotary valves in home? Bookmark and Share

How to remove stone from rotary valves in home?

Postby besson900 » Sun Nov 25, 2018 1:46 pm

Hello!

I have question to all repair guys here

How can I remove stone from rotary valves in home?I know that I can take out valves and put it into some acid but what about the rest of tuba? I have some old Bb Amati which I want to clear and I know that the best way is to give instrument to repair shop but I would like to try to do it alone?You have some experience in this?If YES please tell me how to do it without destroying instrument or what kind of acid you are using for this?
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Re: How to remove stone from rotary valves in home?

Postby Mark » Sun Nov 25, 2018 1:52 pm

You need very specialized equipment to do a chemical clean safely. This should only be done by a qualified repair shop.
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Re: How to remove stone from rotary valves in home?

Postby Dan Schultz » Sun Nov 25, 2018 2:31 pm

You can flush the horn with white vinegar followed by a good rinse. Vinegar is a mild acid and it might take a bit of time depending on the amount of calcium you have built up. The next step up is CLR. It's a little quicker but don't forget to rinse it out completely. You can monitor the progress visually.
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Re: How to remove stone from rotary valves in home?

Postby bloke » Sun Nov 25, 2018 2:42 pm

Muriatic acid is used to dissolve similar substances (excess grout or concrete, or to clean grout or concrete) in other industries, and - in the past - was used (one or two tablespoons per cup of water...??? HEY, I'm GUESSING, because I NEVER used it) to clean brass instruments.

Muriatic acid (in the concentration in which it's sold) is VERY strong and the fuming is VERY bad (quite dangerous, in my view). :( :!:
I like the (non-fuming/effective) product that Allied Supply Corporation sells to the repair industry. Find someone who has a tank of that stuff, and have them clean your instrument.

(I've actually used full-strength muriatic acid to STRIP the silver off the backs of worn mirrors. Again, it's STRONG and DANGEROUS.)
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Re: How to remove stone from rotary valves in home?

Postby Michael Woods » Wed Nov 28, 2018 9:53 pm

By the time you buy all the stuff to do a proper chem clean you might as well take it some place to have it done. But if you have to, you can use Klean-Strip concrete etch from Home depot. You can soak valves in it for 5-10minutes and as long as you got all the grease off the parts it should work fine. A good ration for Phosphoric acid(which is what Klean stip is) should be 1 part phosphoric to 7 parts water. You have to work out the math on that as the Klean strip is only 33% phosphoric acid in a 1 gallon bottle.
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