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Originally Posted by oab_au
Set out below is text copied exactly  Well not quite exactly. You left out the main point.
This bit
The operative words here are, decreasing NORMALLY OPEN PORT FLOW over time, As you can see the valve with zero PWM applied, flows 3.25 Lt/min, when the PWM is increased to 50%, the flow through the valve has decreased to 1.5 Lt/min, at 97% PWM, the valve has closed to decrease the ATF flow to zero.
The page is here; http://www.theleeco.com/EFSWEB2.NSF/...e!OpenDocument
Harvey. 
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Harvey,
How stupid can you get.
The essence of pulse modulation is to reduce the on time in accordance with the application. This is exactly the way port flow IS modulated (controlled). But the on/off time is proportional and NOT static as you try to claim.
NORMAL OPEN PORT FLOW, (FLOW, FLOW) IS DECREASED OVER TIME. The port is MODULATED open, closed to achieve this result.