Answer Posted / www.islamqa.com

perfect answer sam as usual

and if there is something else to say I can say that split
range control ( or call valve sequencing ) is a technique
used for satisfy the procsee requirements.

Actually we have techniques and modes for this strategy.

The used techniques to achieve valve split
ranging /sequencing are:

1 - Valve bench set adjustment (modify the valve itself)
2 - Positioner adjustment
3 - I/P adjustment
4 - Using 1 controller with 1 I/P and 2 adjusted valves
and this is very slow process as we have to wait a long
time till the pressure is built up witin the loop.
5 - using 1 controller with 2 series I/P
and here we face the risk of voltage drop.
6 - using 1 controller with dual o/p.
7 - using 2 controller with the same input.

# And we have 3 main modes for this strategy:

1 - COMPLEMENTARY:
where 1 of 2 valves opening is opposite to the other
@ 4 ma valve-A is fully open while valve-B is fully closed
and thier stems move synchronously.
2 - EXCLUSSIVE
3 - PROGRESSIVE

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310

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