Baker Hughes Masoneilan 4700P, Instruction Manual

Page: 12 / 66

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Installation
Mounting and Orientation
The valve is installed in the pipeline to operate in one of two ways:
Air to Open Air to Close
Close on air failure Open on air failure
(Reverse Action) (Direct Action)
The choice depends on the desired air failure action. This subject is dealt with in separate
actuator instructions. The positioner can operate either by direct action (increasing instrument
signal produces an increase in output pressure) or reverse action (increasing instrument signal
produces a decrease in output pressure). See Figure 3 and Figure 4.
CAUTION
When installing a positioner on a valve, it is necessary to choose
the proper valve action and positioner action. It is absolutely
necessary to place valve travel at the point corresponding to the
low end of the signal range when removing or installing a cam.
At this point, feedback spring compression is at lowest value and
will facilitate cam removal or installation. Prior to performing any
work, read and understand “General Description and Operation”
on page 10 and Installation 2. Define the scope of work to be
performed and find the appropriate section that should be
followed.
NOTE
The 4700E/4800E is not available with reverse action,
hence if the application demands an electropneumatic
positioner and reverse action, a 4700P/4800P with
external I/P Transducer is required.
The 4700 series positioners have the same mounting and linkage attachment dimensions as
the 4600, 4600A, 4600B and 4700B series positioners but have a different layout of pneumatic
connections. They can replace the older models if operational requirements are identical and
pneumatic connections are changed. The mounting details in this instruction cover only the
more widely used valves and actuators.
NOTE