As shown in the figure, regarding the sealing issue of the ASCO two-way three-port solenoid valve
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The manufacturer said that if the seal of this type of solenoid valve is too tight, a siphon effect can occur, allowing water vapor to enter from the outside. I would appreciate it if someone could explain the detailed mechanism behind this.
The sealing issues of the ASCO two-way three-port solenoid valves are mainly related to the siphon effect and the entry of moisture inside. I will explain it in detail below. The siphon effect refers to the phenomenon where, when there is a certain pressure difference in a pipeline, liquid flows through it and a low-pressure area is formed within the pipe; the air pressure in this low-pressure area draws the liquid from the high-pressure area toward the low-pressure area. If the seals of the two-way three-port solenoid valves in ASCO are too tight, it will result in low pressure inside the valves, thereby creating a siphon effect at the pipe connections and causing the liquid in the pipes to flow back. Water vapor enters from the outside to the inside, mainly due to poor sealing of the ASCO solenoid valve or aging of the sealing material, which leads to failure. When the humidity in the external environment is high, water vapor can easily enter the interior through leakage gaps in the valves or cracks caused by the aging of the sealing materials, which affects the stability and service life of the equipment. Therefore, when selecting ASCO two-position three-way solenoid valves, it is necessary to pay attention to the quality of their sealing performance, as well as the quality and service life of the sealing materials. During use, it is also necessary to regularly inspect and replace the sealing materials to ensure the proper operation and service life of the equipment. .
I’ve also learned a bit about this recently; there’s something called the \"breathing effect,\" which is explained using the ideal gas law. In simple terms, the pressure of the gas inside a sealed chamber changes as the ambient temperature changes. When the sealing isn’t perfect, temperature fluctuations cause the gas to flow in order to maintain pressure equilibrium between the inside and outside of the chamber. When the temperature inside the sealed chamber rises, gas escapes; when the temperature drops, gas is drawn in. This is what’s known as the breathing effect. Here, the temperature difference between day and night is significant, and electromagnetic valves generate heat during operation. Additionally, there is plenty of rain in spring, so water vapor may penetrate into the chamber as a result. I’m not sure if this is the same phenomenon as the siphon effect you mentioned.