Siphon pipe flow interruption
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After the pipe is filled with water, the flow stops after 40 minutes. In the first ten-odd days, the vertical distance between point A and point B was 7 meters; due to continuous watering, the water level dropped rapidly. Now, the vertical distance between point A and point B has increased to 9 meters. The pipe can withstand 8 units of pressure without leaking. I need a professional to help me figure out what is causing the flow to stop
I guess: the water flow speed must be insufficient; gas enters at point D, flows upstream, and eventually forms a pocket of gas at point B, causing the siphon effect to fail. The solution is to raise the pipe outlet at point D slightly to create a small liquid seal.
I have made improvements to the pipe outlet by installing an elbow, but its opening faces downward; there’s water all the way below, so gas should not flow back out
One standard atmosphere corresponds to a water column of ten meters in height. First, check whether the atmospheric pressure in your area is lower than the standard value. Additionally, consider the pressure drop caused by losses in the pipes and check valves; such losses can be greater than one meter, which may lead to failure
Thank you. Then I would like to ask if there is a solution?
Install a valve at point D; reduce the valve opening when the water inflow rate is low!!
:(Is it because the dissolved gases in your water come out during the siphoning process – negative pressure at the higher points reduces solubility – and thus accumulate at the highest point? That’s why the water supply is interrupted after some time. Apart from installing a sealed container at the higher location to allow venting (filled with water, equipped with a valve at the bottom for regular exhaust), it doesn’t seem like there’s any good solution.)
Have you worked on siphon pipes? Where can I buy this type of valve you mentioned?