Black water waste valve mystery
I just bought a pre-owned 2012 jayflight 19RD. I am a very experienced rv'er but can't figure this one out! While travelling down the road the black water waste valve opens by itself. Needless to say, this is not a pleasant discovery when you get to your next camp spot. Obviously the valve is almost new and yes it was completely closed after dumping. Since the underbelly is enclosed I could not easily inspect the valve. In frustration I finally cut the belly open and replaced it with a new one (even though the original looked fine). Guess what? The new valve does the same thing. This is a very simple mechanism and yes the four screws that hold it in are tight. I have fixed the problem by going to my local Ace hardware and purchasing a collar with a set screw which I placed over the shaft and behind the clamp that the shaft passes through. Now I just lift the rod and pull it through the clamp when I want to dump, but the original cause still baffles me. The only thing that I could come up with is the pull rod was tight against the lp line that runs along the frame and I wonder if it caused a harmonic vibration while travelling which caused it to open. Anybody have any other ideas?