Example of correct
installation
: The inside
diameter of the pipe/flange
is Schedule 40 pipe inside
diameter or less. The
pipe/flange presents a flat
face to the seat.
Typical F955 valve. DN150 with
schedule 40 pipe shown.
Example of incorrect
installation
: Void area of
pipe flange/pipe connection
does not support seat
sufficiently. Fillet weld
between pipe and flange
shown creates this void area.
Thin walled pipes can also
fail to support seats.
A
B
KEYSTONE
KNIFE GATE VALVES
FIGURE 955/956
Storage and installation instructions for F955 ported slide gate valves and F956 dual gland ported slide gate valves
STORAGE
IMPORTANT
Do not remove any identification or instruction
tags from the valve assembly.
For optimum protection, undercover storage is
desirable.
Valves
Flange faces should be protected at all times
with wooden, or heavy cardboard shields.
Valves should be handled carefully to prevent
damage to exterior protective coating. Flange
bolt holes should be coated with a suitable
rust inhibitor for prolonged or exterior storage.
Care should be taken in the placement of valves
in storage to assure excessive pressure is not
placed on polymer body shrouds or spindle
covers so as to cause component damage.
F955
valves should be stored in the closed
position.
F956
valves should be stored in the open
position.
Handwheel spindle thread should NOT be
lubricated as dirt will accumulate in threads.
VCIOM-02872-EN 17/05
INSTALLATION INSTRUCTIONS
Heavy valves will require a chain block
or crane to assist in the installation.
In difficult installations, large actuator
cylinders may be removed from the valve
and re-fitted after installation. When re-fitting
the actuator cylinder care must be taken
to ensure the cylinder/valve alignment is
maintained (refer cylinder fitting instruction
sheet). Larger actuated valves installed in
vertical pipework will require structural
support to take the weight of the actuator.
This support may also be desirable in larger
valves installed in non-vertical positions.
The F955/F956 is configured for installation
in conventional bolted flange connections.
Flanges are required to support the seat by
presenting a flat surface across the seat. If
the flange does not present a flat surface
then companion flanges can be used. The
companion flanges should be raised or flat
face type to ensure full sleeve support and a
continuous, unvarying I.D. If slip-on flanges
are used without companion flanges, the pipe
should be cut square and welded in position
with the pipe end matched evenly with the
flange face. (see below diagram)
CAUTION
Care must be taken with the installation of the
F955/F956 valve to resilient faced companion
flanges. Excessive tightening of the flange bolts
will result in severe valve seat damage on valve
actuation. Companion flange bolts must only be
tightened as noted below.
1. Close valve.
2. Check the valve size is correct and there
is adequate clearance to install the valve.
3. Check valve and pipe flange faces are clean
and smooth, and that the valve bolt pattern
is the same as the flange.
4. Check flange bolt sizing and ensure the bolt
threads are clean (separate technical data is
available).
5. Check the alignment of the upstream and
downstream pipes and the squareness
of the pipe flanges.
Actuators
All air line and electrical cable entries should
be plugged to prevent the ingress of foreign
material. Actuator cylinders, where not fitted
to a valve, should be stored with the piston rod
fully retracted. Internal cylinder components
should not require any corrosion inhibitor as
they are assembled with a light coating of
grease.
SAFETY PRECAUTIONS
Actuated valves are generally operated from
a remote location.
Caution should be exercised when working in
close proximity to these valves. The F955/F956
valves are supplied with upper body shrouds
and spindle covers for environmental and safety
purposes.
To ensure the long term operation and safety
of the valves, the covers and shrouds must be
maintained at all times.
Spare parts
Seats, cord and packing should be carefully
stored and protected from sharp edges or
heavy objects which could damage sealing
faces.
A) Example of incorrect installation:
Void area of pipe flange/pipe connection
does not support seat sufficiently. Fillet weld
between pipe and flange shown creates this
void area. Thin walled pipes can also fail to
support seats.
B) Example of correct installation:
The inside diameter of the pipe/flange is
Schedule 40 pipe inside diameter or less. The
pipe/flange presents a flat face to the seat.
TYPICAL VALVE INSTALLATION WITH
SCHEDULE 40 PIPE SHOWN.
Emerson.com/FinalControl
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Содержание KEYSTONE FIGURE 955
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