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 > November 2020 > 2020.11.05 > 03Prev  Next

Aeolian Sting II Suction Box Check Valve
By John A. Tuttle

Hi All,  The check valve in the vacuum pump box of the Aeolian Sting II
player piano is a spring-loaded valve that is located in a lead casting
to which four plastic valve blocks are glued (see attached graphic).
Detailed pictures at the link below show exactly where the valve is

With regards to problem Rick Hageman explained in his posting [201031
MMDigest], the reason I said that the problem didn't sound like it
involved the check valve is because he also said, "....however, there
is a massive loss of suction and the roll will not play when I turn on
the switch."

So, if the check valve was stuck closed, there would be no vacuum loss
through the suction box when foot -pumping. And, if it was stuck open,
the system would get all the vacuum that the pump was able to produce.
Ergo, I said that the problem most likely wasn't the check valve.

In closing, due to the relatively crude design of the check valve
and the relatively weak spring used to keep the valve closed, it is
possible (although rare) for the valve to fail. However, getting to the
valve to repair it is not a simple task -as can be seen in the pictures
in the web page listed above.

I should also mention that of the 500+ Aeolian players I've worked on,
only one had a stuck valve (stuck closed), and the problem was resolved
by applying a drop of Marvel Mystery Oil on the valve guide pin and
pushing the valve down a few times until it moved freely. (I still
don't think that's Rick's problem.)

John A Tuttle
Brick, NJ, USA

 [ Aeolian Sting II Check Valve location
 [ Check Valve (close-up)

(Message sent Thu 5 Nov 2020, 21:54:53 GMT, from time zone GMT-0800.)

Key Words in Subject:  Aeolian, Box, Check, II, Sting, Suction, 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 1995-2024 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

Please Support Publication of the MMD with your Generous Donation

Pay via PayPal

No PayPal account required

Translate This Page