The spring-loaded variable area flow meter (an extension of the variable area flow meter) uses a spring as the balancing force. This makes the flow meter independent of gravity, allowing it to be used in any plane, even upside-down.
However, in its fundamental configuration (as shown in the Below Figure ), there is also a limitation: the range of movement is constrained by the linear range of the spring, and the limits of the spring deformation.
However, another important feature is also revealed: if the pass area (the area between the float and the tube) increases at an appropriate rate, then the differential pressure across the spring-loaded variable area flow meter can be directly proportional to flow.
so Spring-Loaded Variable Area Flow meters can measure the rate of flow with either float movement (variable area) or with a Change in Pressure (if a Differential pressure transmitter is connected across it).
Source: spiraxsarco
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