Flowserve Valtek Mark 200 - Manual (Page 5)

5
Mark 200 Control Valve FCD VLENIM0200– 12/12
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Table 2: Recommended ASME Body Bolt Torque Values
Bolt/Stud Material
Bolt Size
Carbon Steel Stainless Steel
(inches) ft lb N m ft lb N m
1-1⁄8 520 691 380 447
1-1/4 730 990 460 624
1-3⁄8 1000 1356 630 854
1-1/2 1320 1790 840 1139
1-5⁄8 1710 2318 1080 1464
1-3⁄4 2170 2942 1400 1898
1-7⁄8 2700 3660 1700 2305
2 3350 4542 2100 2847
2-1/4 4050 5491 2530 3430
2-1/2 4850 6575 3010 4081
2-3⁄4 5900 8000 4400 5960
3 7273 9860 5913 8015
5 ASME Valve Maintenance
At least once every six months, check for proper operation by following
the preventative maintenance steps outlined below. These steps can be
performed while the valve is in-line and, in some cases, without interrupting
service. If an internal problem is suspected, refer to the “Valve Disassembly
and Reassembly” section.
1. Look for signs of gasket leakage through the end flanges and bonnet.
Retorque flange and bonnet bolting (if required). See Table 2.
2. Check for fluid leakage to the atmosphere through the body drain plug, if
applicable.
3. Examine the valve for damage caused by corrosive fumes or process
drippings.
4. Clean valve and repaint areas of severe oxidation.
5. Check packing box bolting for proper tightness. Refer to the packing
installation manual for specific details on maintaining the style of
packing supplied.
CAUTION: Do not overtighten packing. This can cause exces-
sive packing wear and high stem friction that may impede
stem movement.
6. If the valve is supplied with a lubricator fitting, check lubricant supply
and add lubricant if necessary. See product documentation or contact
the Flowserve representative.
7. If possible, stroke the valve and check for smooth, full-stroke operation.
Unsteady stem movement could indicate an internal valve problem.
NOTE: Due to excessive friction, graphite packing can cause the plug
stem to move in a jerky fashion.
WARNING: Keep hands, hair and clothing away from all moving
parts when operating the valve. Failure to do so can cause
serious injury.
8. Make sure positioner linkage and stem clamp or coupling pieces are
securely fastened. If the stem clamp or coupling pieces are loose, check
plug thread engagement (refer to the “Reassembling the Body” section
for the correct procedure on aligning the plug with the seat.) Tighten
stem clamp nut or counter nut.
9. Ensure all accessories, brackets and bolting are securely fastened.
10. If possible, remove air supply and observe actuator for correct fail-safe
action.*
11. Check rubber actuator bellows for splits, cuts or wear.*
12. Check tightness of the actuator. Spray a soap solution around the
cylinder actuator retaining ring, adjusting screw and actuator stem
guide to check for air leaks through the O-rings. *
13. Clean any dirt and other foreign material from the plug stem.
14. If an air filter is supplied, check and replace cartridge if necessary.*
* Pneumatic operated control valves
** Pneumatic operated control valves with safety function