Setting-up a rotary valve

[Chuck(G)]

What's customarily done to reorient a valve stroke by 180 degrees is to rotate the stop block (drilling new holes for it and plugging the old ones) Alternatively, a new stop block fixture could be fabricated.

To rotate the stroke by 90 degrees however, is best done by reworking the stop arm itself, moving the stop block if necessary.

Neither operation is something for the inexperienced.

...if I understand what you're asking...

[corbasse]

What's customarily done to reorient a valve stroke by 180 degrees is to rotate the stop block (drilling new holes for it and plugging the old ones) Alternatively, a new stop block fixture could be fabricated.

On many french horns the thumb valve is constructed so you can set it to work either way. They simply make the thingy on the rotor where the lever is attached to with fixing points on both sides. So instead of being shaped something like this:

oO

it looks like this: oOo



Simply fixing the lever to the other side of the shaft would do the job. You do need a straight lever though, not a fancy curly one (liky my VMI has)

Isn't there a simple, clear name for all these parts?

[cjk]

You can (much more simply) modify the stop arm.


<img src="http://tinypic.com/1gpvs2" WIDTH="500">

[cjk]

Here's an example that's probably closer to what you want to do (??)

<img src="http://tinypic.com/21o0ev" alt="Image hosted by TinyPic.com">