Re: Re: Re: Valve port blisters.


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Posted by Jay Bertolet on January 18, 2002 at 10:28:26:

In Reply to: Re: Re: Valve port blisters. posted by Duh... on January 18, 2002 at 09:22:46:

I'll take a stab at this one:

If you look at any tubing on the tuba, you will see the cylindrical nature of the tube. Unless there are dents where you look, the tube is mostly cylindrical with maybe some gradual expansion. Now look at your piston valves. Imagine that the cylinder shape you see in the valve tubing should continue through the valves. Now look at any pair of ports on the valves and see if it does. Sometimes there is an actual cylinder going between the two valve ports. Other times, the true cylinder isn't preserved, because in between the ports there is a convex portion in what should be a cylinder. The reason for this is that you can't intersect all the cylinders in a piston valve without having those cylinders overlap. The manufacturers makes these convex sections in the valves to make room for all the necessary cylinders to fit in the allotted space.

Geometry always was a problem for me. ;-)


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