and those of 50mm and above are connected with flange. But some special types of meters also have 40mm flanged connections. TYPES BY APPLICATION According to usage application water meter includes residential water meter and industrial water meter.TYPES BY INSTALLATION DIRECTATION Velocity water meter have two methods of installation :horizontal type and vertical type. When installed, the flow direction of the meter is parallel or perpendicular to the horizontal surface. "H"stands for horizonta