Common valve opening is greater. Flow changes with the opening of the volume of the smaller. In general cut-off valve opening is greater than 3/4, flow rate close to the maximum, open no adjustment.
The control valve is to solve this problem by changing the spool shape, but in the actual operating conditions, the above phenomenon in different degree will appear.
Self-operated valve from the processing cost of the valve design, usually not very particular about, just the pursuit of fit as much as possible situations, so the large opening may adjust the performance is not good.
Of course this is not absolute, not the smaller the better, 1/4 ~ 3/5 is relatively ideal opening.
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