1. Examine entire valve and report any
damage or discrepancies to supplier prior to
installation.
2. Inspect accessories, if any, including
solenoids, limit switches, positioners, etc.
for functionality prior to installation.
3. Large manual hand wheels may sometimes
be shipped loose in container.
4. Packing screws should be checked
and adjusted to torque stated in IOM as
these could loosen during transport —
overtightening will reduce seal life.
WARNING
Take safety precautions to avoid risk to personnel
from unexpected leakage through packing when
valve is first exposed to pressure.
STORAGE
Important
Do not remove any identification or instruction
tags. For optimum protection, store valve
undercover.
GasketGasket
Flange
Valves
Flange faces should be protected at all times
with wooden or heavy cardboard shields. On
iron bodied valves, lubricate threaded flange
bolt holes to prevent rusting. Apply protective
coating to seating faces of metal to metal
seated valves. Valves should be stored flat
with the flow arrow pointing downwards and in
the closed position, (but not jammed tight) to
protect seating faces and gate from damage.
Handwheel spindle threads should NOT be
lubricated otherwise dirt will accumulate in
threads.
Actuators
All air line and electrical cable entries should
be plugged. If cylinders are not fitted to a valve,
they should be stored with the piston rod fully
retracted. Cylinders are assembled with a light
coating of grease on internal components.
Spare parts
Seats and packings should be carefully stored
and protected from sharp or heavy objects
which will damage sealing faces.
On standard valves, turn handwheel anticlockwise to open valves, and clockwise to
close valves.
FLANGE BOLTS
CAUTION
It is critical that flange bolts do not bottom out in
valve body otherwise valve damage will occur.
To determine bolt length for the blind holes
in the upper chest area of the valve, add
dimension ‘R’ + gasket + flange thickness + any
washers etc. (plus deflection cone and gasket
when used).
1. Stud bolts can be used in the blind holes in
the chest area of the valve body to alleviate
the risk of flange bolts bottoming out.
2. Coating of flange bolt threads with an
anti-seize compound (Loctite
®
729 etc.)
is recommended to prevent bolt seizure,
particularly when using S/S bolts with S/S
valves, or when using steel bolts in iron
valves.
2
CLARKSON FIGURE 952 KNIFE GATE VALVES
STORAGE AND INSTALLATION
INSTALLATION INSTRUCTIONS
NOTE
Heavy valves will require a chain block or crane to assist. In difficult locations, large cylinder actuators can be
removed from valve and re-fitted after installation if necessary, but check cylinder to gate alignment carefully
and that valve seats correctly. (Refer cylinder fitting instructions).
1. Close valve.
2. Check valve size is correct and that there is adequate clearance to install valve.
3. Check flange faces are clean and smooth and that bolt hole patterns on pipe flanges are the
same as the valve, and are in line.
4. Check bolt sizes and threads are clean and compatible with the valve. (Separatetechnical data
is available.)
5. Check gaskets match flanges and are suitable for the service.
6. Check that the pipeline, upstream and downstream, is correctly aligned.
7. If a deflector cone is being used, fit it to upstream side of valve with the cone nozzle pointing
downstream, prior to installation. Metal (chrome iron) cones must have gaskets fitted between
the cone and valve, and between cone and flange. Resilient urethane cones do not require
these gaskets.
8. Spread flanges to clear valve, check flow arrow on side of valve is in the right direction. (Valve
seating face and gate are downstream). Lower valve into position. Insert gaskets, 1 each side.
9. Insert flange bolts. On wafer valves, insert bolts into the threaded bolt holes in the chest of the
valve first but do not tighten until all bolts are fitted. Tighten bolts in adiagonal sequence (refer
Figure 2).
10. Ensure bolts in the chest area of the valve are not bottoming out in the blind holes.
11. Open and close valve to check it is operating correctly.
12. After pipe line is pressurized, check for flange leaks and for gland leaks, adjust as necessary.
FIGURE 2
FIGURE 3
Gasket
1
8
6
4
3
2
Blind holes in
chest area
5
7
VERTICAL PIPE APPLICATIONS
Figure 952 is a unidirectional valve utilizing three RTFE-tipped gate guides positioned on the
upstream side of the gate surface to ensure optimum alignment with seating surface throughout
the full valve stroke.
A backpressure ring may be recommended to replace the gate guides in applications where
backpressure is likely to occur as part of normal operating conditions, or where the valve is
installed in a horizontal orientation (most commonly with a vertical pipe – refer Figure 5 and 6)
with gate not supported by the seating surface.
The backpressure ring ensures the gate position is maintained in close contact with seating
surface in the closed position and throughout the full valve stroke.
FIGURE 5FIGURE 6
Bolt
Pipe flange
FIGURE 4
3
CLARKSON FIGURE 952 KNIFE GATE VALVES
STORAGE AND INSTALLATION
PURGE PORTS (WHERE FITTED)
Optional stainless steel purge nozzles can be
fitted in lower part of body. If sedimentation
occurs preventing gate from closing fully, purge
with compressed air or water. Alternatively,
connect permanent installation to purge ports
and purge periodically. Purge port hole is 3 mm
(⅛ in) BSPP.
GLAND ADJUSTMENT
The gland on new and repaired valves may
require final adjustment after installation and
pressurisation of the valve. If packing leaks,
tighten gland nuts equally until leaking ceases.
A 32 mm (1¼ in) AF spanner fits DN 50 - 600
(NPS 2 - 24) valve size.
If gland leakage persists, check that pipeline
isnot pressurized above rating of valve.
Alternatively, packing may be damaged,
wrongly installed or have foreign matter caught
between gate and packing.
Disassemble, inspect and repair or replace
asnecessary.
CAUTION
Do NOT over tighten gland packing as it will
causeexcessive resistance to gate movement.
SAFETY
The gland on new and repaired valves may
require final adjustment after installation
and pressurisation of the valve.
Actuated valves are generally operated from a
remote location, caution should be exercised if
working in close proximity to any moving parts.
NOTE
To minimize risk to personnel, Emerson recommend
the use of purpose built guards and shrouds. Refer to
the Emerson data sheet or consult factory for details.
4
CLARKSON FIGURE 952 KNIFE GATE VALVES
STORAGE AND INSTALLATION
CYLINDER SUPPORT METHODS FOR
HORIZONTALLY OR OFF-VERTICAL MOUNTING
INSTALLATION A
1. Pneumatic and hydraulic cylinders require
additional support when mounted in an
orientation other than vertical, and failure to
do so could lead to failure of cylinder and/or
valve.
2. Suggested methods included in this
document are conceptual in nature,
and design of supporting structures is
responsibility of user.
3. It is important that linear actuator and gate
are aligned axially.
4. Supports shall be designed to maintain
alignment and carry bulk weight of actuator
and own weight considering all loads.
FIGURE 7
Turn buckle for adjustment
Saddle-style hanger
INSTALLATION B
FIGURE 8
Saddle-style support
Appropriate tie-in capable of supporting load
INSTALLATION C
FIGURE 9
Turn buckle for adjustment
Alternate head support,
saddle-style preferred
5
10
15
14
11
13
CLARKSON FIGURE 952 KNIFE GATE VALVES
REMOVAL, DISASSEMBLY AND INSPECTION
FIGURE 10FIGURE 11
13
12
15
10
3
1
8
5
9
2
6
7
4
13
REMOVAL AND DISASSEMBLY
16
18
23
22
18
17
1. Ensure pipeline is not pressurized and that
any hazardous medium is drained away.
2. Large valves need a chain block or crane
to assist. If large, heavy cylinders are fitted,
they can be removed first if felt necessary:
• Disconnect actuator air lines and power
8
9
15
14
19
5
20
supplies etc.
• Support actuator, disconnect actuator rod
from valve gate, undo bridge bolts or hold
down bolts, remove actuator from valve.
3. Support valve body and remove all flange bolts.
4. Remove valve and gaskets from the pipeline.
For DN 50 - 200 (NPS 2 - 8) valves
• Loosen gland box nuts (10) to end of pillar
(9) threads. Remove clevis fastener (15).
2
Remove both bridge nuts (13).
• Remove handwheel (or actuator assembly.
Unscrew both pillars (9) and remove.
• Check threads on spindles and bolts - repair/
replace if necessary.
• Ensure all parts are clean and free of foreign
material, particularly the chest area between
the gland and valve bore.
• For optimum leak-free service, gate faces
• Replace Nyloc nuts if threads are stripped
or weakened. These are used as protection
against vibration.
• Check and replace gate guides (13) ifnecessary.
and edges must be smooth, and free of
galling or burring. Repair or replace if
excessively worn or damaged.
• Seating faces in valve bore must be smooth
and undamaged otherwise leakage is likely
tooccur. Replace if necessary.
• Check gland sealing faces on top of
valve body. They should be smooth and
undamaged. Repair if necessary.
6
19
13
22
21
10
20
CLARKSON FIGURE 952 KNIFE GATE VALVES
REMOVAL, DISASSEMBLY AND INSPECTION
NON - RISING SPINDLE VALVES
• Ensure all parts are clean and free of foreign
material, particularly the chest area between
the gland and valve bore.
• For optimum leak-free service, gate faces
and edges must be smooth, and free of
galling or burring. Repair or replace if
excessively worn or damaged.
• Seating faces in valve bore must be smooth
and undamaged otherwise leakage is likely
tooccur. Replace if necessary.
• Check gland sealing faces on top of
valve body. They should be smooth and
undamaged. Repair if necessary.
• Check threads on spindles and bolts - repair /
replace if necessary.
• Replace Nyloc nuts if threads are stripped
or weakened. These are used as protection
against vibration.
• Check and replace gate guides (11)
ifnecessary.
REMOVAL AND DISASSEMBLY
1. Ensure pipeline is not pressurized and that
any hazardous medium is drained away.
2. Large valves need a chain block or crane
to assist. If large, heavy cylinders are fitted,
they can be removed first if felt necessary:
• Disconnect actuator air lines and power
supplies etc.
• Support actuator, disconnect rod from
valve gate, undo bridge bolts or hold down
bolts, remove actuator from valve.
3. Support valve body and remove all flange
bolts.
4. Remove valve and gaskets from the pipeline.
• Remove gland box nuts (8) and washers
(21, 10). Remove clevis fasteners (13) and
washers (22).
• Remove upright mounting bolts (12) and
washers (14) at valve body (1). Remove
pillar nut (19) and washer (9).
material should be replaced whenever the
valve has been disassembled for routine
15
18
17
14
8
5
maintenance. This is a very simple procedure
which can be done leaving the valve in the
pipeline.
Correct packing is essential for leak-free
operation. Use Emerson’s preformed and precut packing replacement kits for best results.
Kits are available in the following types:
K-LON - Standard packing material.
D-LON - Food grade packing.
G-LON - High cyclic packing.
19
21
20
H-LON - Abrasive service packing.
Ensure packing material selected is suitable
forthe service.
PACKING PROCEDURE
NOTE
Care should be taken to stagger the mitred joints
in each layer of packing to the opposite side of the
glandbox, e.g.;
• 1st packing layer joint to the front of the valve
• 2nd packing layer joint to the rear of the valve
• (On larger valves) 3rd packing layer joint to the front
of the valve.
1. Press first layer of gland packing (6) into
gland box (3) cavity by hand, then repeat
the process with the second layer ensuring
the joints of the two layers are on opposing
sides of the cavity.
2. Push gate (2) (rounded edge first) gently
through top of gland box with packing
underneath, then turn upside down and
9
DISASSEMBLY PROCEDURE
2
1. Ensure the pipeline is not pressurized and
any hazardous medium is drained away.
11
3
1
10
12
6
7
2. Close valve. Loosen gland box nuts (10) to
end of pillar (9) threads.
3. Remove clevis fastener (19).
4. Remove both bridge bolts (14).
5. Remove bridge sub-assembly (handwheel,
handwheel nut, spindle and bridge or
cylinder actuator and bridge).
push gland box to 25 mm (1 in) from the
end of the gate. Firmly press packing in
with fingers around gate then fit the RTFE
scraper blade (7) (not fitted on polyurethane
trim valves) in bottom of gland box.
13
4
Note: DN 50 - 200 (NPS 2 - 8) valve illustrated.
FIGURE 14
NOTE
Heavy valves will require a chain block or crane to
assist.
6. Unscrew both pillars (9).
7. Unscrew gate guides approximately 2 turns
(not applicable on polyurethane trim valves).
8. Withdraw gland box (3) and gate (2)
sub-assembly.
9. Remove scraper (7) (not fitted on
polyurethane trim valves) and packing
segments (6) from the gland box (3), noting
the number of layers.
10. Clean gland box (3) and gate (2). Check gate
for irregularities or abrasion on the seating
side. If excessive, discard and replace.
1. With bevelled edge (not applicable on
polyurethane trim valves) of gate up stream
and away from the seating face, place gland
box / gate sub-assembly into body and push
gate down until firmly wedged at bottom of
valve.
2.
Screw the gland box nuts (10) onto each
pillar (9), add washers (11) and (12). Coat
threads with anti-seize compound. Put each
pillar sub-assembly through gland box holes
and screw them into the valve body lug until
pillar is level with the bottom of the body lug.
Height of pillars (9) should be equal.
NOTE
For polyurethane trimed valves, ignore steps 3
through 5.
3. Screw in the gate guides (13) until they
contact the gate, do not over tighten.
4. With gate firmly wedged into bottom of
valve, push top of gate towards downstream
side to ensure it is firmly up against seat (4),
then tighten pillar nuts.
5. Check gate alignment (gate closed).
If correctly fitted and aligned:
• Gate will be fitting firmly and evenly up
against seating face in valve body.
• Gate and gland box will be approximately
centred with the valve body viewed from front
and sides.
• Gate will be true and parallel to valve body
axis viewed from the side.
• Gate will not have significant movement
when rocked backwards and forwards
(upstreamand downstream, not sideways).
If not fitted correctly:
• Gate is not seating properly into the wedges
in the base of the valve and/or the gate guides
in the upper body of the valve are badly worn,
missing or incorrectly adjusted - repair as
necessary.
6.
Fit bridge sub-assembly (handwheel,
handwheel nut, spindle and bridge or
cylinder actuator and bridge) to the top of the
pillars and secure using bridge bolts (14).
7. To fit the clevis pin (19) adjust the spindle (5)
until the holes in the spindle and the gate
are aligned.
8. Assembly is complete, actuate to check all
is functioning as desired and gate reseats
itself into the wedges at bottom of the valve
body. If re-seating does not occur, loosen
gland box nuts (8) and remove gland box,
clean and repeat steps.
NOTES
1. At commissioning or plant start-up, open and
close valve to check it is operating correctly gland nuts (8) may require adjustment. Please
ensure to tighten equally.
2. To minimize risk to personnel, Emerson
recommends the use of purpose built guards
and shrouds. Refer to the Emerson data sheet or
consult factory for details.
CAUTION
Do NOT over tighten gland packing as it will cause
excessive resistance to gate movement.
For optimum performance, the packing
material should be replaced whenever the
valve has been disassembled for routine
maintenance. This is a very simple procedure
which can be done leaving the valve in the
pipeline.
Correct packing is essential for leak-free
operation. Use Emerson’s preformed and precut packing replacement kits for best results.
Kits are available in the following types:
K-LON - Standard packing material.
D-LON - Food grade packing.
G-LON - High cyclic packing.
H-LON - Abrasive service packing.
Ensure packing material selected is suitable for
the service.
DISASSEMBLY PROCEDURE
1. Ensure the pipeline is not pressurized and
any hazardous medium is drained away.
2. Close valve.
3. Remove gland box nuts (10) and washers
(11, 12). A 32 mm (1¼ in) AF spanner suits
all valve sizes.
4. Remove clevis bolts (19) and nuts (20).
5. Remove pillar nut (23) and washer (22).
6. Remove upright mounting bolts (14) and
washers (15) at valve body (1).
7. Remove handwheel (16) upright (8) and
spindle (5) as an assembly.
8. Remove gland box (3) from gate (2)
leavingthe gate in the valve body.
9. Remove scraper (7) (not fitted on
polyurethane trim valves) and packing
segments (6) from gland box, noting number
of layers.
10. Clean gland box (3).
NOTES
Although not essential, valve gate can also be removed
for inspection at this stage.
For optimum leak-free service, gate faces and edges
must be smooth, and free of galling or burring.
Repair or replace if excessively worn or damaged.
When re-fitting gate, ensure bevelled edge of knife
gate is upstream and away from seating face.
Care should be taken to stagger the mitred joints
ineach layer of packing to the opposite side of the
gland box, e.g.;
• 1st packing layer joint to the front of the valve
• 2nd packing layer joint to the rear of the valve
• 3rd packing layer joint to the front of thevalve.
1. Press first layer of gland packing (6) into
gland box (3) cavity by hand, then repeat
the process with the second layer ensuring
the joints of the two layers are on opposing
sides of the cavity.
2. Fit the RTFE scraper blade (7) (not fitted on
polyurethane trim valves) in bottom of gland
box.
ASSEMBLY PROCEDURE
1. Using masking tape, hold packing in place
temporarily by passing tape through gland
box slot around packing onto edge of
gland box (one piece per side minimum
recommended).
2. Coat gland box studs (21) with nickel based
anti-seize compound.
3. Place the gland box (3) over gate (2), sliding
the gland box down to make contact with
thebody and remove temporary holding
tape.
4. Tighten gland box nuts equally (10) ensuring
nylon washer (12) is positioned between
metal washer (11) and gland box (3).
5. Replace handwheel (16), upright (8) and
spindle (5) assembly.
6. Replace pillar bolts (14) and washers (15)
atvalve body (1).
7. Replace pillar nut (23) and washer (22)
ensuring thread is coated with nickel based
anti-seize compound.
8. Lower the spindle clevis (5) onto the gate (2)
and replace clevis mounting bolts (19) and
nuts (20).
9. Check the alignment of spindle, upright and
pillar and tighten fasteners (14 and 23).
10. Assembly is complete, actuate to check all
is functioning as desired and gate reseats
itself into the wedges at bottom of the valve
body.
NOTES
1. At commissioning or plant start-up, open and
close valve to check it is operating correctlygland nuts (8) may require adjustment.
Pleaseensure to tighten equally.
2. To minimize risk to personnel, Emerson
recommend the use of purpose built guards
andshrouds. Refer to the Emerson data sheet or
consult factory fordetails.
CAUTION
Do NOT over tighten gland packing as it will cause
excessive resistance to gate movement.
1. Cut through seat (4) and remove from
valve body using a narrow bladed chisel or
screwdriver.
2. Remove all burrs and sharp edges from
seat groove in body (1) and ensure it is free
of any oil or dirt or bonding residues.
3. With a clean rag or brush, wipe seat groove
clean. Then apply Cyberbond bonding agent
1
(2241) in a small (1 mm (
/
16 in)) continuous
bead. Avoid excessive adhesive as it could
remain in groove, causing seat to warp or
build up on seating face, resulting in valve
leakage.
4. Check replacement seat (4) is not damaged
and place into groove. Apply pressure to
displace excess bonding agent.
5. Wipe off excess adhesive from seating face.
6. Apply a light film of petroleum jelly or
lubricant to gate to cover seating face.
7. Insert gate (2) into valve body (1) in the fully
closed position so that it covers seat fully.
8. Apply a light clamping pressure (approx.
5kg (10 lbs) on DN 50 - 200 (NPS 2 - 8)
valves and approx. 15 kg (30 lbs) on
DN250- 600 (NPS 10 - 24) valves) to center
of gate ensuring load is applied to total seat
surface. Maintain for 1 hour.
9. Remove gate (2) and clean thoroughly.
10. Check seat is even and that no bonding
agent residues are on it.
11. Seat fitting is now complete.
12. Refer valve assembly and installation
instructions.
FKM SEAT REPLACEMENT
FKM seats are retained in a dovetail groove in
the valve body.
1. Cut through seat (4) and remove from
valve body using a narrow bladed chisel or
screwdriver.
2. Remove all burrs and sharp edges from
seat groove in body (1).
3. With a clean rag or brush, wipe seat groove
and ensure it is free of any oil or dirt.
4. Check replacement seat (4) is not damaged
and place into groove. Check seat is evenly
entrapped by the dovetail groove.
5. Seat fitting is now complete.
6. Refer valve assembly and installation
instructions.
STORAGE
Seats should be stored on a shelf away from
sharp or heavy objects that may cause damage.
GENERAL NOTES
If the valve is leaking downstream and seat is
damaged or badly worn, it should be replaced.
To replace seats the valve needs to be
removed from the pipeline and disassembled
(referinstructions).
Trim code 170 metal-seated valves are
available in a high temperature configuration
which increases allowable valve operating
temperature up to 650°C (1200°F) with certain
limitations.
Emerson engineering department should be
consulted for all applications with expected
temperatures of 427°C (800°F) or greater.
Material substitutions for high temperature
construction:
• RTFE gate scraper replaced with 316 S/S
• KLON gland packing replaced with high
temperature graphite-based variant
• RTFE-tipped gate guides replaced with
316 S/S backpressure ring
• Nylon thrust washers replaced with
LG2 bronze
• Nylon glandbox washer replaced with 316 S/S
• All high temperature gates have a facemilling operation to remove residual surface
stresses from rolling operation.
Figure 952 high temperature variant - with
CF8M body, gland, yoke and hardware and
316 S/S gate may be used in applications
with 100% solids up to 650°C (1200°F), no
sealing performance on leak rate, and with no
allowance for solid particles bonding to gate or
body preventing gate cycling 100% open port to
100% closed port.
Packing materials used are rated to 850°C
(1562°F), with no other non-metals in valve.
At temperatures above 200°C (392°F) pressure
rating reduces to a maximum of 3 bar (43.5
psi) at 650°C (1200°F). Valves operating at
temperatures ≥ 427°C (800°F) are subject
to intergranular corrosion (reference ASME
B16.34 clause 5.2.1). Therefore cracks could
develop in body and or gate in presence of
tensile stress and are not covered by Emerson
warranty.
14
F952
CLARKSON FIGURE 952 KNIFE GATE VALVES
LOCKOUT KIT INSTALLATION - DN 250-600 (NPS 10-24)
To install on existing valves
1. Ensure pipeline is not pressurized and that
any hazardous medium is drained away.
2. Fully close valve. Remove clevis fasteners
and actuate cylinder or handwheel so clevis
lifts clear of gate.
3. Remove glandbox fasteners, then lift
glandbox off gate.
4. Remove all glandbox studs. Care should be
taken to avoid damage to the gate.
5. Ensure threaded glandbox stud holes are
clean, then install extended length studs
using Loctite
®
provided.
6. Loop the free end of the lockout pin
connecting wire over each stud on one
side of the valve.
7. Check the condition of the packing.
Replace if necessary (separate instructions
available).
FIGURE 22
8. Reinstall the glandbox and fasteners. An
anti-seize compound should be used on the
nuts. Do not over tighten the fasteners.
9. Install the lockout bosses on the studs using
®
Loctite
, and screw down until the bottom
of the hole is in line with the top of the gate.
Ensure the holes in the bosses on opposite
sides of the gate are aligned.
10. Insert the pins to verify installation. The gap
between the top of the gate and the bottom
of the pins should be kept to a minimum.
11. After pipe is pressurized, adjust gland as
necessary.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
notice.
Emerson Electric Co. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of
any Emerson Electric Co. product remains solely with the purchaser.
Emerson.com/FinalControl
16
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