Diamondback; Figure 9: Mark One With Megastream Trim Body Assembly; Figure 10: Mark One With Stealth Trim Body Assembly; Figure 11: Mark One With Tigertooth Trim Body Assembly - Flowserve Valtek Mark Two User Instructions

Figure 9: Mark One with MegaStream Trim Body Assembly

Figure 10: Mark One with Stealth Trim Body Assembly

Figure 11: Mark One with TigerTooth Trim Body Assembly

Valtek Mark One and Mark Two Control Valves FCD VLENIM0001-02-A4 - 05/16
8.2.4.3
a

8.3 DiamondBack

8.3.1
8.3.2
8.3.3
8.3.4
8.3.5
Reassemble the retainer sleeves and reinstall the pins mak-
ing sure to leave an open hole opposite each pin so that the
pin can be driven out in the future. Apply a small (1/8 inch)
bead of weld to each pin to hold it in place.
NOTE: Do not weld more than the approved 1/8 inch.
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.
CAUTION: To function properly, ChannelStream is always
installed flow over.
DiamondBack replaces the standard Mark One retainer with
a stacked-disk retainer that is either welded or bolted and
pinned, see Figure 8. 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 follows the standard procedures.
DiamondBack 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 or replaced. Plugs and retainer mating
surfaces should be examined for damage. Repair and
replacement of damaged parts is critical to maintaining
cavitation resistance.
DiamondBack retainers should be cleaned of debris
whenever the valve is opened.
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.
Disassembly of Bolted DiamondBack Retainers:
Remove the nuts from the bolts/studs. Place the retainer with
the crown disk facing down and remove the bolts/studs from
the stack. Remove the bottom indexed disk. Press the pins
out away from the crown disk. Take the discs apart, maintain-
ing the order of assembly. Replace damaged discs, alignment
pins bolts or nuts. Inspect and clean out disc passages.
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