Reassembling Unbalanced Megastream - Flowserve Valtek MegaStream Installation, Operation & Maintenance Instructions

Bonnet
(Item No. 40)
Bonnet Gasket
(Item No. 58)
Body
(Item No. 1)
Seat Ring
(Item No. 20)
NOTE: Item numbers correspond directly to valve's bill of material. Refer to it for specific part numbers.
without a hoist; in this case, tapped holes are ma-
chined into the top of the attenuator for installation of
lifting rings.
4. Remove the seat ring and seat ring gasket.
5. The attenuator may now be cleaned according to
established industry methods. If uncertain as to
which methods to use with a particular attenuator
and application, contact factory.

Reassembling Unbalanced MegaStream

Refer to Figure 1 and proceed as follows:
1. Install a new seat ring gasket and reinstall seat ring.
NOTE: Bonnet and seat ring gaskets should be
replaced each time the valve is disassembled.
2. Install the cleaned attenuator, making sure the hole
pattern closest to the edge is situated at the bottom
(by the seat ring).
3. Replace bonnet gasket.
18-2
Seat Ring Gasket
(Item No. 55)
Figure 1: Unblanced MegaStream Assembly
4. Fully retract the plug (stem clamp indicator pointing
to the open position) and lower the actuator, bonnet
and plug squarely into the body and attenuator.
CAUTION: The bonnet aligns closely to the
body. Damage could result from misalignment
of the plug and attenuator; therefore, extreme
caution should be exercised in this operation to
make sure it is installed squarely.
5. Once the actuator is resting on the body, tighten the
bonnet flange bolting fingertight.
6. Seat the plug two or three times to center the seat
ring. This can be done by applying air to the actuator.
7. Leaving the plug in the extended (or closed) position,
begin tightening the bonnet flange bolting in a criss-
cross pattern that will keep the bonnet square with
the body. Tighten the first bolt
the bolt directly opposite
8. Continue tightening all bolts until the bonnet is firmly
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Bonnet Flange Bolting
(Item No. 108/114)
Bonnet Flange
(Item No. 70)
Attenuator
(Item No. 30)
Plug
(Item No. 50)
1 / turn, then tighten
6
1
/ turn.
6