Friction between the parts of non-conductive media (liquids or solids) may lead to the creation and accumulation of electrostatic charges. Should these charges lead to the formation of sparks in classified areas (Ex), the explosion hazard would be very high.

In particular, the treatment of liquids or solid substances, whether it is shaking and mixing liquids or filling tanks or loading stations, can lead to dangerous situations.

Within the automation system of loading, unloading and transfer operations, it is required to have a valve which, controlled by an electronic counter or by an external control system, is able to manage the delivery flow rate and the quantity of transferred liquid.

For this specific application, ISOIL diaphragm valves are particularly useful, as the power required to change stateoperate comes from the line pressure, therefore they do not require the presence of electrical or pneumatic actuators.

To protect the measuring instruments, and in particular the PD meters, thus extending their life cycle and reducing maintenance needs, it is important to ensure that there are no solids suspended in the liquid through appropriate filtration.

Play a key role in both measuring and automation of loading procedures.

From a metrological point of view, in combination with the flow rate meter (PD, mass, turbine etc.),, depending on the version, either on the user display or to remote devices through the communication ports:

• the measurement, in the desired unit of measure
• the temperature compensated volume (typically 15°C)
• the pressure compensated volume
• the average flow rate
• the average loading temperature
• ticket printing

P.D. meter (Positive Displacement meter) is a very reliable flow meter type. P.D. flow meters measure the volumetric flow rate of a moving fluid entering a measuring chamber having a fixed and known volume for each meter type. Thanks to their working principle, positive displacement meters can be used even for the measurement of viscous fluids, such as oils, fuels, and solvents that are hardly measured by other meter types

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