Split Range Operation - 4700P/4800P; Split Range Operation - GE Masoneilan 4700P Maintenance Manual

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.
Instrument Signal
psig
3
6
9
12
15
64 | =GE Oil & Gas
Table 4: Split Range Operation
Air Signal to Close
mbar
Valve Plug Position
207
414
620
827
1034
No. 1
(3-9 psig)
Full Open
Half Open
Closed
Closed
Closed
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Air Signal to Close
No. 2
Valve Plug Position
(9-15 psig)
Full Open
Full Open
Full Open
Half Open
Closed
.