hosted on condor3913
 Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > March 2018 > 2018.03.02 > 01Prev  Next


Valve Terminology
By John A. Tuttle

Hi All,  Thought I'd pass along this piece of information that
I received.  I think it's rather genius in it's simplicity:

An inside valve, an outside valve, the top, the bottom -- all as
ambiguous as you can get.  It's like calling a lift an elevator.
Nobody could ever get back down, since they only go up.

That said, 3 or 4 decades ago I was calling primary valves
"non-inverting valves", and secondary valves "inverting valves."
Then I defined it: when the input (air) is the same as the output
(air) that's a non-inverting valve.  Air-in, vacuum out is an
"inverting valve."

All valves are outside valves.  All valves are inside valves.  When
an "inside valve" is "closed,"  half of it is on the outside.  It's in
the room atmosphere, right?  So that's "outside," too.  Outside valves?
Most of an "outside valve" is inside, not outside.  Right?

When we call them inverting and non-inverting valves, one valve isn't
being defined by the other one.  But when we call a non-inverting valve
an "outside valve" -- which is 90% inside anyway, then it is relative
to something else and not descriptive of itself.

A "primary valve" is relative to a secondary valve, but not only that,
it _requires_ the [presence of the] secondary valve in order to be
called "primary."  And when a secondary valve is used alone it's no
longer "secondary."  It's "primary."

Musically,
John A Tuttle
Player-Care.com
Brick, NJ, USA


(Message sent Fri 2 Mar 2018, 13:54:54 GMT, from time zone GMT-0800.)

Key Words in Subject:  Terminology, Valve

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2022 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

                                     
Translate This Page