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2.
Bolt the extension shaft to the valve position take-off shaft (Figure 10).
Figure 10 - Extension Shaft to the Valve Position Take-off Shaft
Internal valve pressure
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
example, 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.
Vacuum service
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.
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.
c.
Aligning the end of the magnet holder flush with the end of the mounting bracket.
Secure the magnet holder with two M4 set screws.
d.
Sliding the V-Seal over the magnet holder. You can also check the magnet using ValVue
software by reading sensor counts and comparing them to Table 2.
4. Secure the SVi1000 onto the mounting bracket using four M6 x 20 mm socket head cap
screws.
5.
Ensure no interference exists with the position sensor protrusion.
6. Ensure that the V-Seal makes contact with the skirt around the alignment ring on the
SVi1000 (Figure 11).
Magnet
Holder
Assembly
Extension
Shaft
Valve
Position
Take Off
Shaft
Tighten the
M4 Screw
(one shown)
Install with
a flat-head
socket cap
screw. 1/4”
.28 UNF