Weaknesses of Epoxy
Posted: Tue Aug 05, 2008 9:05 am
Well, I cut open the valve of my CPS 1000 to fix a leaky pull valve. The leaking was kind of solved. However, it created a new problem. The epoxy wouldn't hold the valve and the valve would leak. I reinforced the valve to a point where I thought it would hold well. However, during battle, the valve started leaking heavily. It was busted again.
It was due to a weakness in the epoxy that I hadn't considered. It was pretty much the point where the epoxy sticked to the valve. When the PC/Bladder was at high pressure, it would gradually push the two halves of the valve apart. As the bond of the epoxy to the plastic is the weakest part of the epoxy fix, it would break. This would allow the halves to move further and ruin the epoxy fix.
When I discovered this, I was relieved because the solution was right in front of me. I told you in the leaky pull valve thread that I reinforced it with wire on one side. Well, the side with the wire stayed perfectly intact. I came to the conclusion that if you reinforce the epoxy with wire (on both sides) and spread out epoxy the problem shouldn't occur. The wire prevents the valve halves from moving apart.
It was due to a weakness in the epoxy that I hadn't considered. It was pretty much the point where the epoxy sticked to the valve. When the PC/Bladder was at high pressure, it would gradually push the two halves of the valve apart. As the bond of the epoxy to the plastic is the weakest part of the epoxy fix, it would break. This would allow the halves to move further and ruin the epoxy fix.
When I discovered this, I was relieved because the solution was right in front of me. I told you in the leaky pull valve thread that I reinforced it with wire on one side. Well, the side with the wire stayed perfectly intact. I came to the conclusion that if you reinforce the epoxy with wire (on both sides) and spread out epoxy the problem shouldn't occur. The wire prevents the valve halves from moving apart.