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GE Oil & Gas
Mounting the SVI II AP on Rotary Valves
This section describes the procedure for mounting the SVI II AP on rotary control valves that have
less than 60° rotation, such as a Masoneilan Camflex
*
II or a Masoneilan Varimax
*
. Figure 9
shows a side view of a Camflex actuator and the SVI II AP actuator mounting brackets.
Figure 9
Camflex with Mounting Bracket (Side View)
Mounting the SVI II AP on a Rotary Actuator
Tools required:
3
⁄
16" Hex Key
5
⁄
32" Hex Key
3 mm, 4 mm, 5 mm Hex Key
7
⁄
16" Wrench
To mount the SVI II AP:
1. Attach the SVI II AP rotary mounting bracket to the valve actuator using two (2)
5
⁄
16 - 18 UNC flat-head cap screws. In the preferred mounting position, the long
end of the mounting bracket is on your left when facing the actuator, for any
position of the valve and actuator.
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)
