Valve Disassembly Clearance - Flowserve Valtek Mark 100 User Instructions

Valtek ® Control Products Mark 100
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
(in)
6
8
10
12
14
16
18
20
24
30
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.
VAIOM000103-02 (EN/AQ) March 2020
and Mark 100SC Control Valves
™
Clearance
in mm
10 254
13 330
14 356
16 406
18 457
20 508
23 584
25 635
31 787
37 940
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 drain 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
pressure regulator 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 slip/stick 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
maintaining 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.
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