Valve Venting Procedure

Sam Gnagey · Post by **Sam Gnagey** » Fri Nov 25, 2005 5:50 pm

It's not all that complex of process, however it shouldn't be undertaken by someone without repair training and experience. There are definite advantages when you have a horn that requires a bit of slide pulling to play in tune, and some players contend that it generally makes a horn play more evenly in slurred and legato passages. It requires drilling small holes in the valve casings.

Chuck(G) · Post by **Chuck(G)** » Fri Nov 25, 2005 6:10 pm

The procedure is somewhat different depending on your having rotary or piston valves.

Carroll · Post by **Carroll** » Fri Nov 25, 2005 6:40 pm

viewtopic.php?t=624&highlight=venting

viewtopic.php?t=8192&highlight=venting

viewtopic.php?t=6288&highlight=venting

viewtopic.php?t=2285&highlight=venting

Art Hovey · Post by **Art Hovey** » Mon Nov 28, 2005 12:04 am

Venting piston valves is very easy. Rotors are more tricky. I saw someone recently who had installed an Amado water key on the top of the first valve slide on his rotary-valve tuba; not for water, but for air. He could just push the button whenever he moved the slide, accomplishing the same result as venting but without the risk. What a clever idea! (Any kind of water key would work just as well, and it can easily be removed if you don't like it.)

windshieldbug · Post by **windshieldbug** » Mon Nov 28, 2005 1:21 pm

Art Hovey wrote:Venting piston valves is very easy. Rotors are more tricky. I saw someone recently who had installed an Amado water key on the top of the first valve slide on his rotary-valve tuba; not for water, but for air. He could just push the button whenever he moved the slide, accomplishing the same result as venting but without the risk. What a clever idea! (Any kind of water key would work just as well, and it can easily be removed if you don't like it.)

That IS a clever idea; what you're actually trying to vent is the slide, not the valve. Although this is generally accomplished by drilling the valve casing, what you're venting is the slide, just the same. The only drawback is having to remember to push the button whenever the air column isn't open and you're doing THAT slide. Which is why I like an adjustable main...

tubarepair · Post by **tubarepair** » Mon Nov 28, 2005 4:33 pm

Attention: Rick Denney!!!

Rick,

Can a valve be designed/manufactured that would be placed on the crook that would open and close automatically with changes in air pressure? This would have to be regulated carefully in the sense that it could not open from the normal air pressure of playing, but only from the vacuum of the slide pull/pressure from the inbound stroke, assuming it is greater. Just trying to get you thinking! DLH