GE Masoneilan 4700E, Maintenance Manual

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Split Range Operation - 4700P/4800P
Split ranging permits the operation of two valves in sequence from one control instrument signal.
The total stroking of each valve occurs with one half the signal (i.e., 3-9 psig or 9-15 psig). The
following table shows, for example, the plug positions of two valves (both air to close action, open
on air failure operating in
split range ) with a 3-15 psig instrument signal.
Table 4: Split Range Operation
Instrument Signal Air Signal to Close
No. 1
Valve Plug Position
(3-9 psig)
Air Signal to Close
No. 2
Valve Plug Position
(9-15 psig)
psig mbar
3 207 Full Open Full Open
6 414 Half Open Full Open
9 620 Closed Full Open
12 827 Closed Half Open
15 1034 Closed Closed