Severe Service Trim Options; Cavcontrol; Channelstream; Figure 6: Mark One With Cavcontrol Trim Body Assembly - Flowserve Valtek Mark Two User Instructions

Figure 6: Mark One with CavControl Trim Body Assembly

Figure 7: Mark One with ChannelStream Trim Body Assembly

Figure 8: Diamondback Trim Body Assembly

12
Valtek Mark One and Mark Two Control Valves FCD VLENIM0001-02-A4 - 05/16

8 Severe Service Trim Options

8.1 CavControl

8.1.1
8.1.2
a

8.2 ChannelStream

8.2.1
8.2.2
8.2.3
8.2.4
8.2.4.1
8.2.4.2
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.
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.
CAUTION: To function properly, CavControl is always installed
flow over.
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.
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.
ChannelStream retainers should be cleaned of debris whenever
the valve is opened.
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.
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.
The retainer can now be inspected for damage or cleaned.