Flow Control Division
Mark 100
4 Mark 100 Installation, Operation and Maintenance Instructions FCD FCAIM0100-02
4 Installation
1. Before installing the valve, clean the line of dirt, welding chips,
scale or other foreign material.
2. Whenever possible, the valve should be installed in an upright
position. Vertical installation permits easier valve maintenance.
a
CAUTION: Do not insulate extension bonnets that are
provided for hot or cold services.
3. Be sure to provide proper overhead clearance for the actuator to
allow for disassembly of the plug from the valve body. Refer to
Table 1 for the necessary clearance needed for valve disassembly.
Table 1: Valve Disassembly Clearance
Valve Size
(inches)
Clearance
inches mm
6 10 254
8 13 330
10 14 356
12 16 406
14 18 457
16 20 508
18 23 584
20 25 635
24 31 787
30 37 940
4. Double-check flow direction to be sure the valve is installed
correctly. Flow direction is indicated by the arrow attached to the
body.
5. If welding the valve into the line, use extreme care to avoid
excess heat buildup in the valve.
6. Connect the air supply and instrument signal lines. Throttling
control valves are equipped with a valve positioner. Refer to the
appropriate positioner bulletin for connections, maximum air
supplies, and maintenance instructions.
a
CAUTION: On valves equipped with air filters, the air
filter must point down to perform properly.
NOTE: In some rare cases, the air supply must be limited to
less than 150 psi (10.3 bar). This is indicated on a sticker found
near the upper air port on the actuator cylinder. An air regula-
tor should be installed to ensure the supply pressure does not
exceed the line pressure indicated on the sticker.
4.1 Quick-check
Prior to start-up, check the control valve by following these steps:
1. Stroke the valve and observe the plug position indicator on the
stem clamp compared to the stroke indicator plate. The plug
should change position in a smooth, linear fashion.
NOTE: Due to excessive friction, graphite packing can cause the
plug stem to move in a jerky fashion.
2. Check for full stroke by making appropriate instrument signal
change.
3. Check all air connections for leaks.
4. Check packing box bolting for the correct adjustment. Refer to
the packing installation manual for specific details on maintain-
ing the style of packing supplied.
a
CAUTION: Do not overtighten packing. This can cause
excessive packing wear and high stem friction that may
impede plug movement.
5. Make sure the valve fails in the correct direction in case of air
failure. This is done by turning off the air supply and observing
the failure direction.
6. After a temperature excursion has occurred, bonnet flange bolt-
ing should be retorqued to ensure bonnet gaskets do not leak.
See Table 2.
Table 2: Recommended Body Bolt Torque Values
Bolt Size
Bolt/Stud Material
Carbon Steel Stainless Steel
(inches) ft-lb N m ft-lb N m
7
⁄8 230 312 150 203
1 350 474 220 298
1
1
⁄8 510 691 330 447
1¼ 730 990 460 624
1
3
⁄8 1000 1356 630 854
1½ 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 paginas)
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