There are quite a few symbols hidden behind numbers and letters on iPhone. The iPhone symbols for currency are a good example, but a less known hidden symbol is the circle that indicates a temperature ...

To use the valve cavitation chart, you need to know the valve style modifier (xT), the upstream pressure (P1), the downstream pressure (P2), the vapor pressure (Pv), and the flow rate (Q).

3How to choose When selecting between linear and equal percentage trim for an air control valve, there is no definitive answer as it depends on several factors such as the system characteristics ...

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