Flowserve Valtek Mark 10 Survivor Control Valves - Manual (Page 11)

11
Valtek Mark 10 Survivor Control Valves FCD VLENIM0036-05 – 07/09
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3
Quick-check
3.1. Stroke the valve and observe the plug position indicator on the stem clamp compared to
the stroke indicator plate. The plug should move through its stroke in a smooth, linear
fashion.
WARNING:
c
Keep hands, hair, clothing, etc. away from all moving parts when operating the valve.
Failure to do so can cause serious injury.
3.2. Check for full stroke by making the appropriate instrument signal change (such as 3-15,
3-9, 9-15 psi or associated split ranges for pneumatic positioners, 4-20 or 10-50 mA for
electro-pneumatic positioners).
3.3. Check all air connections for leaks.
3.4. Make sure the valve strokes in the correct direction in case of air failure. This is done by
shutting off the air supply to the valve and observing the direction of plug stem travel.
CAUTION:
a
Most ceramic surfaces can be damaged by turning the plug while the plug is in
contact with the seat. Ensure the plug is raised off the seat before adjusting the plug.
3.5. After process temperature excursion has occurred, bonnet flange bolting should be
retightened to ensure bonnet gaskets do not leak. See Table II.