Is the only way to connect the v-cone flowmeter to the pipeline is through flange?

The common way to connect V-cone flow meters to pipelines is flange type, but this does not mean that this is the only way. There are also pipe welding type, square pipe type, etc. It’s just that the pipe flange type is the most commonly used method, so other installation methods are rarely seen.

The pipe flange type is that the flange is directly welded on the sensor, and the same flange group is welded on the straight pipe section on site. The last two pairs of flanges can be connected by bolts. This method is more convenient and stable. 

The direct welding type can directly save the cost of four flanges for large-diameter pipes, because it directly welds the V-cone flowmeter on the pipe, so no flange is needed. However, this is a one-time installation, and if subsequent maintenance is required, it will be more complicated to handle.

So relatively speaking, the flange type not only has advantages in installation convenience but is also more practical, so this form is basically used in various working conditions.