VICI Selectors (multiposition) Standard electric - Manual (Page 17)


3. Establish a flow of clean gas (50 psi is adequate) into the port offset
away from the actuator. This port, called the alignment inlet in Figure 10,
will be the designated inlet throughout this procedure.
STUW
Establish gas flow into the common port at 6 o’clock (alignment inlet
in
Figure 10).
4. With the valve facing you and the actuator behind the valve, the port
to the left of or counterclockwise from the alignment inlet corresponds
to Position 1. (See
Figure 10. This is the opposite of valves on air
actuators.)
STUW
With the common port at 6 o’clock as the alignment inlet, the port to
the left of or counterclockwise from the common port at 12 o’clock
corresponds to Position 1.
If the gas is flowing from the port in Position 1, go to Step 5. If you hear
no flow, grip the valve and rotate it either way as necessary (the actuator
keeps the rotor fixed) until gas flows from this port.
NOTE: When listening for flow, it is helpful if the fittings are removed from
the port under consideration but left in the adjacent ports. If all the fittings
have been removed, install a loop connecting the two adjacent ports to bet-
ter isolate the sound of the flow.
5. Grip the valve and rotate it counterclockwise a few degrees past the point
where flow stops.
This sets up a “staging area” for the approach to Position 1.
6. Grip the valve and slowly rotate it clockwise until the first traces of flow
are heard from the port of Position 1. (The port to the left of the alignment
inlet.)
7. While holding the valve
steady, use a soft pencil or
ink marker to make a mark
on the standoff correspond-
ing to the slot in the actuator
clamp ring. This slot makes
a clear fixed reference point
for observing relative rota-
tional positions. In the case
of a closemount valve, make
this mark on the valve body.
(
Figure 11)
8. Continue the slow manual clockwise rotation of the valve body through
the point of peak flow and beyond until the flow stops or is barely percep-
tible, as in Step 6.
9. Make another mark as in Step 7. ( Figure 11)
10. Make a third pencil mark halfway between the first two and rotate the
valve counterclockwise until this midway mark is reached. ( Figure 11)
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Valve Alignments