Flowserve Valtek MegaStream Installation, Operation & Maintenance Instructions

Valtek MegaStream
Control Valves

GENERAL INSTRUCTIONS

The following instructions are designed to assist in the
disassembly, reassembly and troubleshooting of
TM
MegaStream attenuators in Valtek
users and maintenance personnel should thoroughly
review this bulletin in conjunction with Installation,
Operation, Maintenance Instructions 1 (Mark One and
Two Control Valves) before installing, operating or
performing any maintenance on the valve.
This publication does not contain information on install-
ing, maintaining, troubleshooting, calibrating, and oper-
ating Valtek positioners. Refer to the appropriate Main-
tenance Instructions when this information is required.
To avoid possible injury to personnel or damage
to valve parts, WARNING and CAUTION notes
must be strictly adhered to. Modifying this prod-
uct, substituting nonfactory parts, or inferior
parts, or using maintenance procedures other
than outlined could drastically affect perfor-
mance and be hazardous to personnel and
equipment.
MegaStream attenuators are designed to reduce gase-
ous noise in automatic control valves through staged
pressure reduction and turbulence control.
Stream valves have two basic designs: A one- or two-
stage attenuator for low to moderate pressure drop
services and a multi-stage attenuator for high pressure
drop applications. Pressure-balance designs are avail-
able in both types.

Installation

Standard unpacking and installation instructions are
outlined in Installation, Operation, Maintenance In-
structions 1. Regardless of the air-action, it is impera-
tive that valves equipped with MegaStream attenuators
be installed in the line with flow direction under the
Valtek Part No. 10076401
plug. It is also strongly suggested that during start-
up, a strainer be placed in-line before valve to catch
® debris prior to it reaching the MegaStream valve.
valves. Product
WARNING: Improper installation will result in ex-
cessive noise, causing possible damage to valve
parts or injury to personnel.

DISASSEMBLY AND REASSEMBLY

Disassembling Unbalanced MegaStream

Refer to Figure 1 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 stem clamp is pointing to the
2. Remove bonnet flange bolting and lift actuator, bon-
Mega-
3. With the actuator, bonnet and plug removed, the
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
open position on the actuator stroke plate.
net and plug assembly out of the valve body. Re-
move the bonnet gasket.
WARNING: A hoist may be necessary for larger
actuators (size 50 and larger). Care must be
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.
attenuator can be lifted out of the valve body. In
larger sizes, the attenuator may be too heavy to lift
18-1