How the of Water Flow Meter

Water flowmeter that is used in PDAM water service company in Indonesia use special kind of flow meter that is name Positive Displacement Flowmeter. Positive displacement flow meter work only when water enter into flowmeter. Entering water to the flowmeter can be from head or from tail is the same calculating. The record number of entering water to the flow meter always positive, this is mean that number changing on the flow meter always positive never deducted. 

For the detail work of this flow meter can be seen on my videos: or you can click this link: PDAM water flowmeter working.