If the valve stem in the 50% position of the whole trip, then the flow through the valve is also in the most large 50%?
Look at what the spool is, there are a variety of curve relations, look at the equipment demand flow, and work methods.
if it is a linear valve, then the flow is equal to 50%; if it is a logarithmic valve (equal percentage valve), less than 50%.
Not necessarily, depending on the structural characteristics of the valve. In the case of constant pressure difference between the two ends of the valve, if the valve is quick to open, the flow is greater than 50%;
