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Internal valve
pressure
Vacuum
service
3. Perform magnet install and travel sensor alignment by:
a. Sliding the magnet holder into the extension shaft. The magnets are in the
magnet holder ring. The magnetic axis is the imaginary line through the center
of both magnets.
b. Rotating the magnet holder so that the magnet axis is vertical when the valve is
in the closed position (Table 2). If mounting kit is installed on fail-open valve,
apply air to the actuator to close the valve before installing magnet holder.
26 | =GE Oil & Gas
The valve plug shaft is pushed out to the mechanical stops,
usually a thrust bearing. On valves where the valve position take-off
is mounted directly on the end of the plug shaft, a Camflex for exam-
ple, the shaft must be bearing on its stop to properly set up the
SVi1000 positioner. During hydrostatic testing the shaft is thrust to its
stop and a normally tightened packing retains it in that position.
The valve shaft is drawn into the body by the vacuum acting on the
shaft, but the magnetic coupling must be assembled flush with the
mounting bracket.
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