V-cone flow meter

Products

The V-Cone flow meter is a differential pressure type flowmeter. Basic theories behind differential pressure type flowmeters have existed for over a century. The principal theory among these is Bernoulli’s theorem for the conservation of energy in a closed pipe. This states that for a constant flow, the pressure in a pipe is inversely proportional to the square of the velocity in the pipe. Simply, the pressure decreases as the velocity increases. For instance, as the fluid approaches the V-Cone flow meter, it will have a pressure of P1 .

Features

As the fluid velocity increases at the constricted area of the V-Cone, the pressure drops to P2 , as shown in Figure:

Both P1 and P2 are measured at the V-Cone flow meter’s taps using a variety of differential pressure transducers. The Dp created by a V-Cone flow meter will increase and decrease exponentially with the flow velocity. As the constriction takes up more of the pipe cross-sectional area, more differential pressure will be created at the same flowrates. The beta ratio equals the flow area at the largest cross section of the cone (converted to an equivalent diameter) divided by the meter’s inside diameter.

Advantages

1. Lower sensitivity than orifice plates and Venturi tubes to installation effects
2. Shorter installation lengths
3. Less pressure loss than orifice plates
4. Wafer (between flange) versions
5. Effective for wet gas flow measurement applications

Disadvantages

1. Lack of standards
2. Not as much data available as “ISO 5167” meters
3. Pressure loss higher than Venturi tubes