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Problems Associated with Low Humidity
and Sealing Pouches with RTV

The most common problem associated with low humidity is the pouch-to-valve stem clearance. Since all leather pouches 'self-adjust' to an optimum clearance when they are new, only minimal care is required to insure that the pouch-to-stem clearance is adequate (about 1/16") for correct performance. However, as the pouch leather ages, it shrinks a bit and it becomes a bit stiff. These two factors reduce the pouch-to-stem clearance to a critical level. So much so that vacuum is required to 'suck' the valve closed when it first starts up. Then when the lower humidity of Winter comes along, the pouches are actually 'holding' (or 'pushing') many of the valves open a slight amount, to the point where the foot pumps can't produce enough air flow to overcome the valve leakage -and suck the valves closed. (BTW, sucking the valves closed 'pushes' the pouch further into the pouch well, and stretches them ever so slightly.) Then, when the humidity level rises again, the pouches become a little softer and a little less stretched, to the point where the valves can now seat (or close) without much effort, and the system seems to 'come alive'.

The best corrective measure is to replace the pouches. Next to that is stretching them slightly by pressing them down into the pouch well with your finger. Another option is to stretch and then seal the pouches with a sealer like Dow Corning 3140. See:

Sealing Pouches with Dow Corning 3140 RTV

Musically,

John A Tuttle
Player-Care.com

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This page was last revised May 9, 2014 by John A. Tuttle, who Assumes No Liability
For The Accuracy or Validity of the Statements and/or Opinions
Expressed within the Pages of the Player-Care Domain.
Cartoon Graphics by E7 Style Graphics (Eric Styles)


Since "Player-Care" is an internet business, I prefer that we correspond via E-Mail (click here to fill out the 'Request Form'). However, if I'm not in the middle of some other activity, you can reach me at 732-840-8787. But please understand that during the hours from 8AM-5PM EST (Mon-Sat), I'm generally quite busy. So, I probably won't answer the phone. If you get the answering machine, please leave a detailed message stating the reason for your call. Also, repeat your name and phone number clearly and distinctly. By necessity, I prioritize everything in my life. And, if you call and just leave your name and number, and ask me to call you back, it might be a day or two before I return your call. Why? Because I don't know why you want me to call and I might not be prepared to assist you in an effective and efficient manner. If you leave me an E-Mail address (which I prefer), spell it out phonetically. The more you do to help me, the more I can help you in return. Don't rush. You have four minutes to record your message.



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