---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 01/30/13: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:42 PM - pneumatic system woes (Elmar & Manuela Hegenauer) ________________________________ Message 1 _____________________________________ Time: 08:42:05 PM PST US From: Elmar & Manuela Hegenauer Subject: Yak-List: pneumatic system woes Keith and others, I usually have my all my check valves on my CJ overhauled with every annual. For that purpose I have stocked up springs and rubber pads but I can't remember the supplier :-( To make a long story short, all those rubber pads I have used over the years have failed sooner or later between the annuals, so I got curious. Now let's get technical, Brian Lloyd are you still alive? The rubber pad in a CJ check valve has a nominal diameter of 13 mm what translates into a area of circle of roughly 132 square millimetres or 1.32 square centimetres. The physical weight introduced to this little piece of rubber is around 66kgs/145 lbs at 50 bars/700 psi. That is a lot of pressure on a small rubber disc going against the sharp and perforated seat of the lower check valve assembly. I have done some tests in my workshop at factor 1.5 over a period of several months and the rubber pads all disintegrated (with and without air tool oil), the material seems to be too thin and soft!!! Any constructive thoughts or ideas? cheers Elmar ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.