Flowserve Valtek Mark 10 Survivor Control Valves - Manual (Page 17)

17
Valtek Mark 10 Survivor Control Valves FCD VLENIM0036-05 – 07/09
flowserve.com
ring should be allowed to slide out of the body smoothly, with only light hand pressure to hold
it in place. If the seat begins to bind, immediately stroke the valve open. Remove the seat and
check for dings or dirt. Stroke the valve slowly to avoid slamming the plug into the seat ring.
NOTE: By stroking the valve closed, the gap between the piston and yoke is closed.
5.2.8.10. Repeat steps 5.2.8.7 through 2.5.8.9 until the plug just contacts the seat. Stop as
soon as the two are in contact.
5.2.8.11. Stroke the valve open. Turn the plug back into the actuator stem one quarter turn.
This will ensure that the plug will not contact the seat during operation.
5.2.8.12. Remove the seat ring from the body. Set and tighten the stem clamp.
5.2.8.13. Stroke the valve closed and move the lower jam nut down until it contacts the limit
stop hub.
5.2.8.14. Stroke the valve open and lower the jam nut one eighth a turn. Lower the upper jam
nut and tighten the two together.
5.2.8.15. Stroke the valve closed to verify the jam nuts are set correctly.
5.2.8.16. Replace the limit stop cap.
5.2.8.17. Replace the seat ring and seat ring gasket.
5.2.9. Valves with ceramic trims without actuator limit stops, or non-standard actuators
5.2.9.1. This procedure uses the adjustment of the plug stem the actuator stem to limit the
travel of the plug. Any actuator limit stops should be set before proceeding.
5.2.9.2. Loosen the stem clamp to allow the plug to rotate in the actuator stem.
5.2.9.3. Using a wrench to keep the actuator stem from rotating, spin the plug into the
actuator stem until only one to one and a half threads are still exposed.
5.2.9.4. Check to make sure the seat ring and plug are clean of dirt, debris or any other
contamination.
NOTE: Flowserve can offer graphite ribbon which can be used to provide a thin pad between the
plug head and seat ring surfaces. It is recommended that similar padding be used to lower the
risk of ceramic fracture.
5.2.9.5. With the seat gaskets removed, place the seat ring into the body and hold in place
using hand pressure.
5.2.9.6. Stroke the valve open.
5.2.9.7. Turn the plug out one quarter turn, or less when fine tuning the plug position.
5.2.9.8. Stroke the valve closed. Note if the plug contacts the seat ring. This can be felt as the
seat ring moves due to contact with the plug.
CAUTION:
a
Contacting the seat ring and plug with ceramic trimmed valves could cause the seat
ring or plug to fracture. Take great care in allowing these two surfaces to contact. The seat ring
should be allowed to slide out of the body smoothly, with only light hand pressure to hold it
in place. If the seat begins to bind, immediately stroke the valve open. Remove the seat and
check for dings or dirt. Stroke the valve slowly to avoid slamming the plug into the seat ring.
5.2.9.9. Repeat steps 5.2.9.6 through 5.2.9.8 until the plug just contacts the seat. Stop as
soon as the two are in contact.