Instruction Manual
2525
Fig. 31 Air pockets inside the pipe
The greater the diameter of the pipe, the higher the speed of the liquid will be required to move the air
pockets away from the flowmeter.
It is also important to understand what kind of eect the water pressure has on the nature of the air
pocket inside the pipe. The lower the pressure in the tube, the greater the size of the air pocket is, and
the greater the eect it will have on the performance of the flowmeter. By increasing the pressure in the
duct, the air pocket will compress, causing fewer problems.
This can be achieved by installing pressure control valves after the flowmeter to maintain constant
pressure in any situation.
Fig. 32 Example of pressure control valves
One solution is to install the flowmeter on a pipe with an increasing slope so that the entrapped air pocket
will move to the highest point. Then, through special vent valves, the air will be released from the pipe,
maximizing the system capacity.
Fig. 33 Pipe with an increasing slope for application of vent valves
A minimum slope in an ascending flow of 1: 500 or higher is recommended in order to stimulate the
entrapped air pocket to move away from the meter.
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