Factorio – How to Split Items per Second from a Blocked Full Belt in Factorio

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I have a full blue belt and want to take of 10 items/s while the belt is blocked (that is the belt is currently not moving). How can I split x items/s from a blocked belt?

If the belt wasn't blocked I would use a balancer, but I don't know any design that works with a blocked belt.

--(up to 40 items/s)--S  (0 items/s blocked)
                      S--(10 items/s)--
where S: splitter
      -: belt

(Note that the first output of the splitter is not connected and the whole belt would not move if it wasn't for the 10 items/s on the second output).

Best Answer

You can connect two belt tracks with green/red wire like this:

====S===== (blocked)
    SAB=== (10 items/s)

Where:
= - belt
S - splitter
A and B - belts connected by wire

Set B to read belt content on hold.

Set A to enable/disable when amount of items is below some value. You'll have to play around with values to get exactly 10 per second.

More information about circuit network can be found here: https://wiki.factorio.com/Tutorial:Circuit_network_cookbook