Disassembling Pressure-Balanced Megastream - Flowserve Valtek MegaStream Installation, Operation & Maintenance Instructions

Bonnet
(Item No. 40)
Sleeve Gasket
(Item No. 56)
Bonnet Gasket
(Item No. 58)
Body
(Item No. 1)
Seat Ring
(Item No. 20)
Figure 2: Pressure-balanced MegaStream Assembly
NOTE: Item numbers correspond directly to valve's bill of material. Refer to it for specific part numbers.
seated, metal-to-metal, in the body. This can be
easily felt through the wrench.
9. Slowly stroke the plug up and down to check the
alignment of the plug with the attenuator.
Disassembling Pressure-balanced
MegaStream
Refer to Figure 2 and proceed as follows:
WARNING: Depressurize line to atmospheric pres-
sure and drain all fluids before working on the
valve. Failure to do so can cause serious injury.
1. Fully retract plug until indicator is pointing to the
open position.
2. Remove bonnet flange bolting and lift the actuator,
bonnet and plug out of the valve body. A hoist may
be necessary for larger valves.
WARNING: A hoist may be necessary for larger
actuators (size 50 and larger). Care must be
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Seat Ring Gasket
(Item No. 55)
Bonnet Flange Bolting
(Item No. 108/114)
Bonnet Flange
(Item No. 70)
Sleeve
(Item No. 31)
Attenuator
(Item No. 30)
taken to lift the actuator and plug straight out of
the valve body. Any scraping of parts while
removing the actuator may damage valve parts.
When the actuator is not equipped with a lifting
ring, do not attach one; instead, lift the actuator
by using lifting straps through the yoke legs. In
this case, the center of gravity may be above the
lifting point. Therefore, support must be given to
prevent the actuator from rotating; otherwise,
serious injury may result.
WARNING: Danger exists in removing the actua-
tor, bonnet and plug–especially if Teflon pres-
sure-balanced seals are used. The attenuator
sleeve may stick to the plug and fall during
disassembly, causing possible serious injury
and/or damage to the valve or nearby equipment.
Steps 3 thru 6 must be followed before attempt-
ing to remove the plug from the sleeve.
3. If the sleeve is observed sticking to the plug during
Plug Seals
(Item No. 65)
Plug
(Item No. 50)
18-3