Flowserve Valtek Mark 200 Manual de usuario descargar pdf (Pagina 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

1-¼ 730 990 460 624

1-3⁄8 1000 1356 630 854

1-½ 1320 1790 840 1139

1-5⁄8 1710 2318 1080 1464

1-¾ 2170 2942 1400 1898

1-7⁄8 2700 3660 1700 2305

2 3350 4542 2100 2847

2-¼ 4050 5491 2530 3430

2-½ 4850 6575 3010 4081

2-¾ 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

1 2 3 4 5 6 7 8 9 10 ... 19 20

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