NotchFlo DST
Instruction Manual
Form 5794
February 2005
3
Figure 2. NotchFlo
r
DST Trim
W8538–1
Specifications
Specifications for Design NotchFlo DST valves are
shown in table 1.
Installation
WARNING
Always wear protective gloves,
clothing, and eyewear when
performing any installation operations
to avoid personal injury.
Personal injury or property damage
caused by sudden release of pressure
may result if the valve assembly is
installed where service conditions
could exceed the limits given in table 1
or on the appropriate nameplates. To
avoid such injury or damage, provide a
relief valve for over-pressure
protection as required by government
or accepted industry codes and good
engineering practices.
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
If installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section in this instruction manual.
WARNING
Some bonnet flanges have a tapped
hole that was used to handle the
bonnet during manufacture. Since this
tapped hole was not designed or
intended to support the weight of the
valve/bonnet assembly, do not use
this tapped hole to lift the valve
assembly or personal injury may result
from the assembly falling.
CAUTION
When ordered, the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions. Since
some body/trim material combinations
are limited in their pressure drop and
temperature ranges, do not apply any
other conditions to the valve without
first contacting your Fisher sales
office.
1. Before installing the valve, inspect it to ensure
that the valve body cavity is free of foreign material.
2. Clean out all pipelines to remove scale, welding
slag, and other foreign materials before installing the
valve.
3. Flow through the valve must be in the direction
indicated by the flow arrow, which is cast on or
attached to the valve body.
4. Use accepted piping practices when installing the
valve in the pipeline. For flanged valve bodies, use a
suitable gasket between the body and pipeline
flanges.
5. Install a three-valve bypass around the valve if
continuous operation is required during
maintenance.
6. If the actuator and valve body are shipped
separately, refer to the actuator mounting procedure
in the appropriate actuator instruction manual.
7. If the valve body was shipped without packing
installed in the packing box, install the packing
before putting the valve body into service. Refer to
instructions given in the Packing Maintenance
procedure.
