Working Principle of MEMS Protective Venting Products - Wuxi Sinceriend New Material Technology Co., Ltd.

Pressure Sensing and Control
Pressure Sensor Operation: MEMS protective ventilation products have built-in ultra-sensitive pressure sensors, which are composed of tiny silicon-based components. These components are extremely sensitive to pressure changes and can capture extremely subtle pressure fluctuations. When the pressure in the tank changes, such as the increase in ambient temperature and the expansion of diesel fuel, the pressure sensor will quickly sense this change and convert the pressure signal into an electrical signal.
Micromechanical Structure Response: After receiving the electrical signal, the micromechanical structure connected to it starts to work. This structure is usually composed of carefully designed microvalves or vents. When the pressure exceeds the set threshold, the microvalve automatically opens to form a ventilation channel, allowing the excess pressure in the tank to be released and the pressure in the tank to return to normal levels. Conversely, if the pressure in the tank decreases, outside air can enter through a specific one-way vent to balance the pressure in the tank and ensure that the tank body will not be damaged due to pressure imbalance.
Impurity Filtration Mechanism
MEMS Filtration Structure: The product is equipped with a sophisticated MEMS filtration structure, which is composed of a micron-level or even nano-level filter or filter membrane. These filters have extremely small and regular pores. When outside air enters the tank under pressure, impurities such as dust and particles will be intercepted by the filter.
Water vapor separation technology: For water vapor, some MEMS protective ventilation products use special water vapor separation technology. For example, by using a combination of hydrophilic and hydrophobic materials, when air containing water vapor passes through, the water vapor is adsorbed and gathered by the hydrophilic material, and finally discharged through a specific drainage channel, while dry air continues to enter the tank, thereby effectively preventing water vapor from mixing with diesel and ensuring the quality of diesel.