Why do we use solenoid valves...Because they are a cost effective and reliable way of turning electrical energy into linear force. We use themSafety valves when we want to move something. Valves, switches, latches, many mechanisms can be moved with solenoids. Their use is limited by the application and cost. In automotive applications, over a certain power, solenoidsPlug Valves tend to become quite large and the cost becomes prohibitive. Some explosive applications mean the solenoids are not viable for obvious reasons. However, there are many hazardous applications that do have solenoids and solenoid valves. There are solenoid valvesReducing Valves on the atlantic seabed and the are solenoid valves on space craft. Solenoid valves are ubiquitous. Solenoid used with valves can be digital. i,e on or off...or proportional meaning for they move a precise amount for a given electrical current input. The Cv value is for water flow with a delta P of 1 PSI. A valve will handle much much more gas with a delta P of 1 PSI. If flow calculations are very important: ask the supplier to give the whole calculation (with dimensions) to give an exact comparison between competitors. Balance ValvesCompanies tend to differ in use of calculation pressure/data inputs, not giving the whole story. SomeAPI Cast Steel Valves companies gives out Cv's for air, putting in 'normal pressures' to recalculate the Cv which actually have to be based on water. This is only OK if you give the data for the calculation. To obtain a good, unrestricted flow, largest Cv value for else equal valve dimension and power requirements, lifetimecost etc. is a better choice for on/off valves.

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