Elimination of gas filter is a subsidiary device of the liquid flowmeter, in the use of volumetric flowmeter to measure the flow of liquid, if the liquid is mixed with gas, the liquid and the gas mixed in it at the same time to be measured, the flowmeter itself, although a high degree of accuracy is also meaningless. Therefore, must be measured in the liquid into the flow meter before trying to remove the gas mixed into the measured liquid. Elimination of gas filter can play a role in separating and eliminating the role of gas contained in the liquid, and can filter the measured liquid contains impurities particles, so as to ensure the normal operation of the flow meter and flow measurement accuracy.