
Flowserve.com 15
VAIOM000103-02 (EN/AQ) March 2020
Valtek®Control Products Mark 100™ and Mark 100SC Control Valves
7.3 DiamondBack™
1. DiamondBack replaces the standard Mark One retainer
with a stacked-disk retainer that is either welded or bolted
and pinned; see Figure 9. Several of the parts, including
the plug, seat ring and bonnet, may have dimensional
differences from the standard Mark One design. Assembly
and disassembly of the valve follow the standard
procedures.
2. DiamondBack retainers, plugs and seats should be exam-
ined for excessive cavitation damage when disassembled.
The inner holes in the retainer should be checked for wear
or erosion; evidence of erosion should require that the
retainer is disassembled or replaced. Plugs and retainer
mating surfaces should be examined for damage. Repair
and replacement of damaged parts are critical to main-
taining cavitation resistance.
NOTE: Do not weld more than the approved 1⁄8in.
Excessive heat from the bead welds that are too large
can disturb critical retainer tolerances. Use an appropriate
weld rod which is compatible with the retainer material.
If uncertain, contact the factory.
a CAUTION: To function properly, ChannelStream is always
installed flow over.
Valtek Mark One and Mark Two Control Valves FCD VLENIM001-03 AQ - 12/17
12
8 Severe Service Trim Options
8.1 CavControl
8.1.1 CavControl replaces the standard Mark One retainer with
a drilled, stepped-hole retainer, see Figure 6. The plug and
bonnet have dimensional differences from the standard Mark
One design. Assembly and disassembly of the valve follows
the standard procedures.
8.1.2 CavControl retainers, plugs and seats should be examined for
excessive cavitation damage when disassembled. Holes in
the retainer should be checked for worn or eroded surfaces.
Check for plugged holes in the retainer. Plugs and retainer
mating surfaces should be examined for damage. Repair
and replacement of damaged parts is critical to maintaining
cavitation resistance.
a CAUTION: To function properly, CavControl is always installed
flow over.
8.2 ChannelStream
8.2.1 ChannelStream replace the standard retainer with multiple
sleeves pinned together, see Figure 7. The plug, seat ring,
and bonnet have dimensional differences from the standard
Mark One design. Assembly and disassembly of the valve
follows the standard procedures.
8.2.2 ChannelStream retainers, plugs and seats should be examined
for excessive cavitation damage when disassembled. The
inner holes in the retainer should be checked for wear or
erosion, evidence of erosion should require that the retainer is
disassembled. Plugs and retainer mating surfaces should be
examined for damage. Repair and replacement of damaged
parts is critical to maintaining cavitation resistance.
8.2.3 ChannelStream retainers should be cleaned of debris whenever
the valve is opened.
8.2.4 Use the following steps if the retainer must be disassembled
to clean or inspect for damage. ChannelStream retainers in
pressure classes 900 and higher cannot be disassembled
in the field. Contact your local Flowserve representative for
service options.
8.2.4.1 Carefully grind away the small bead welds located on the
assembly pins near the top of the retainer. This will loosen
the pins which hold the retainer together. Using a punch,
locate the hole in the retainer opposite the pin and drive each
pin out of the retainer.
8.2.4.2 The retainer can now be inspected for damage or cleaned.
Figure 6: Mark One with CavControl Trim Body Assembly
Figure 7: Mark One with ChannelStream Trim Body Assembly
Figure 8: Diamondback Trim Body Assembly
Figure 8: Mark One
with ChannelStream
trim body assembly
3. DiamondBack retainers should be cleaned of debris
whenever the valve is opened.
4. It is rare that DiamondBack stacks require disassembly to
clean. The passages of the DiamondBack can be cleaned
by pushing a wire through the passages from the inside of
the stack, by air or by water rinsing. When required, pinned
and bolted DiamondBack retainers can be disassembled
and cleaned in the field. Welded DiamondBack retainers
should not be disassembled outside a qualified service
center.
5. Disassembly of bolted DiamondBack retainers:
Remove the nuts from the bolts/studs. Place the retainer
with the crown disc facing down and remove the bolts/
studs from the stack. Remove the bottom indexed disc.
Press the pins out away from the crown disc. Take the
discs apart, maintaining the order of assembly. Replace
damaged discs, alignment pins bolts or nuts. Inspect and
clean out disc passages.
6. Reassembly:
Care should be taken when reassembling to stack up
the discs in the same order and the same rotation. Start
by driving the pins into the crown disc. Then place each
disc in descending order until all discs, except the bottom
indexed disc, are in place. Drive the pins until they are
bottomed out. Place the bottom disc on and replace the
bolts/studs. Bolts must be torqued; torque values are
available from your local Flowserve contact.
a CAUTION: To function properly, DiamondBack is always
installed flow under.
Valtek Mark One and Mark Two Control Valves FCD VLENIM001-03 AQ - 12/17
12
8 Severe Service Trim Options
8.1 CavControl
8.1.1 CavControl replaces the standard Mark One retainer with
a drilled, stepped-hole retainer, see Figure 6. The plug and
bonnet have dimensional differences from the standard Mark
One design. Assembly and disassembly of the valve follows
the standard procedures.
8.1.2 CavControl retainers, plugs and seats should be examined for
excessive cavitation damage when disassembled. Holes in
the retainer should be checked for worn or eroded surfaces.
Check for plugged holes in the retainer. Plugs and retainer
mating surfaces should be examined for damage. Repair
and replacement of damaged parts is critical to maintaining
cavitation resistance.
a CAUTION: To function properly, CavControl is always installed
flow over.
8.2 ChannelStream
8.2.1 ChannelStream replace the standard retainer with multiple
sleeves pinned together, see Figure 7. The plug, seat ring,
and bonnet have dimensional differences from the standard
Mark One design. Assembly and disassembly of the valve
follows the standard procedures.
8.2.2 ChannelStream retainers, plugs and seats should be examined
for excessive cavitation damage when disassembled. The
inner holes in the retainer should be checked for wear or
erosion, evidence of erosion should require that the retainer is
disassembled. Plugs and retainer mating surfaces should be
examined for damage. Repair and replacement of damaged
parts is critical to maintaining cavitation resistance.
8.2.3 ChannelStream retainers should be cleaned of debris whenever
the valve is opened.
8.2.4 Use the following steps if the retainer must be disassembled
to clean or inspect for damage. ChannelStream retainers in
pressure classes 900 and higher cannot be disassembled
in the field. Contact your local Flowserve representative for
service options.
8.2.4.1 Carefully grind away the small bead welds located on the
assembly pins near the top of the retainer. This will loosen
the pins which hold the retainer together. Using a punch,
locate the hole in the retainer opposite the pin and drive each
pin out of the retainer.
8.2.4.2 The retainer can now be inspected for damage or cleaned.
Figure 6: Mark One with CavControl Trim Body Assembly
Figure 7: Mark One with ChannelStream Trim Body Assembly
Figure 8: Diamondback Trim Body Assembly
Figure 9: DiamondBack
trim body assembly