Baker Hughes Masoneilan SVI II AP Series, Quick Start Manual

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= Masoneilan SVI II AP Digital Positioner Quick Start Guide | 32
2. Bolt the extension shaft to the valve position take-off shaft
using a 1 ⁄ 4 - 28 UNF socket flathead screw. Secure the
machine screw holding the extension shaft with a torque of
144 in-lbs (16.269 N-m).
3. On internal valve pressure the thrust 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 example, the shaft must
be bearing on its stop to properly set up the SVI II AP
Controller. During hydrostatic testing the shaft is thrust to its
stop and a normally tightened packing retains it in that
position.
4. On vacuum service, the valve shaft may be drawn into the
body by the vacuum acting on the shaft, but the magnetic
coupling must be assembled flush with the mounting
bracket with the shaft pulled fully out to its thrust bearing.
Check that the endplay from the vacuum position to the
fully extended position is less than 0.06 in. (1.524 mm).
5. Slide the magnet holder into the extension shaft. The
location of the magnets is in the ring of the magnet holder.
The magnetic axis is the imaginary line through the center
of both magnets.
6. Rotate the magnet holder so that the magnet axis is vertical
when the valve is in the closed position.
7. Align the end of the magnet holder flush with the end of the
mounting bracket. Secure the magnet holder with two M6
set screws.
8. Slide the V-Seal over the magnet holder.
9. Secure the SVI II AP onto the mounting bracket using four
M6 x 20 mm socket head cap screws.
10. Ensure no interference exists with the position sensor
protrusion.
11. Ensure that the V-Seal makes contact with the skirt around
the position sensor protrusion on SVI II AP housing.