Clarkson Clarkson Figure 952 IOM, Clarkson-EN Manuals & Guides

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CLARKSON KNIFE GATE VALVES

FIGURE 952

Installation and maintenance instructions

GENERAL APPLICATION

The Clarkson F952 is designed for a wide range of applications such as:

• Pulp and paper

• Mining

• Effluent handling plants

• Chemical plants

• Food and beverage

• Fly ash handling plants

• Bulk conveying

• Corrosive environments

TECHNICAL DATA

Size range: DN 50 - 600 (NPS 2 - 24) Temperature rating: 150°C (300°F) RTFE

seated 150°C (300°F) FKM seated 230°C (445°F) 316 S/S

seated Pressure rating: 1000 kPa/10 bar (150 psi)

at cold working pressure

(non-shock)

FEATURES

• Compact design

• Self-aligning gland box

• 316 S/S valve body construction for superior corrosion resistance

• One piece integral cast body, chest and lugs.

• Integral cast in gate wedges minimize flow obstructions

• High quality gate finish for optimum sealing

• High flow rates with low pressure drops

• Integral RTFE gate scraper

• Gate guides to support gate

• A range of seat options available

• Complies with MSSSP-81 face-to-face dimensions

• All valves are pressure tested to MSSSP-81

• Maintenance friendly

LABEL CONTENTS

Item Description Example

Trim Trim Option 170 MAWP Maximum Allowable Working Pressure 150 psi / 1 MPa COO Country of Origin Made in Australia

COMPLIANCE LABEL

VCIOM-16488-EN 21/09

CLARKSON FIGURE 952 KNIFE GATE VALVES

STORAGE AND INSTALLATION

FIGURE 1

Flange

Valve

‘R’ ‘R’

INITIAL INSPECTION

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.

THREAD DEPTHS

Valve size DN (NPS)

50 (2) 10 ⅜ 65 (2½) 10 ⅜ 80 (3) 11 100 (4) 11 125 (5) 14 150 (6) 14 200 (8) 16 ⅝ 250 (10) 16 ⅝ 300 (12) 16 ⅝ 350 (14) 16 ⅝ 400 (16) 19 ¾ 450 (18) 24 500 (20) 19 ¾ 600 (24) 19 ¾

Thread depth

mm inches

HANDWHEEL OPERATION

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.

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. (Separatetechnical 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 adiagonal 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

Blind holes in chest area

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 5 FIGURE 6

Bolt

Pipe flange

FIGURE 4

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 isnot 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 asnecessary.

CAUTION

Do NOT over tighten gland packing as it will causeexcessive 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.

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

CLARKSON FIGURE 952 KNIFE GATE VALVES

REMOVAL, DISASSEMBLY AND INSPECTION

FIGURE 10 FIGURE 11

REMOVAL AND DISASSEMBLY

23 22

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

15 14

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).

Remove both bridge nuts (13).

• Remove handwheel (or actuator assembly. Unscrew both pillars (9) and remove.

For DN 250 - 600 (NPS 10 - 24) valves

10 12

• Remove gland box nuts (10) and washers (11,12). Remove clevis fasteners (19, 20).

• Remove upright bolts (14) and washers (15) at valve body (1). Remove pillar nut (23) and washer (22).

5. Withdraw gland box (3) and gate (2) assembly.

6. Remove gate guides (13) from valve body (1).

Note: DN 50 - 200 (NPS 2 - 8) valve illustrated. Note: DN 250 - 600 (NPS 10 - 24) valve illustrated.

RISING SPINDLE VALVES

• 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) ifnecessary.

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 tooccur. Replace if necessary.

• Check gland sealing faces on top of valve body. They should be smooth and undamaged. Repair if necessary.

13 22

21 10

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 tooccur. 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) ifnecessary.

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).

Withdraw gland box (3) and gate (2) assembly.

6. Remove gate guides (11) from valve body (1).

FIGURE 12

14 12

Note: DN 250 - 600 (NPS 10 - 24) non-rising spindle valve illustrated.

CLARKSON FIGURE 952 KNIFE GATE VALVES GLAND PACKING REPLACEMENT - DN 50 - 200 (NPS 2 - 8)

FIGURE 13

PACKING REPLACEMENT

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.

21 20

H-LON - Abrasive service packing. Ensure packing material selected is suitable forthe service.

PACKING PROCEDURE

NOTE

Care should be taken to stagger the mitred joints in each 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

• (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

DISASSEMBLY PROCEDURE

1. Ensure the pipeline is not pressurized and any hazardous medium is drained away.

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.

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.

CLARKSON FIGURE 952 KNIFE GATE VALVES

GLAND PACKING REPLACEMENT - DN 50 - 200 (NPS 2 - 8)

ASSEMBLY PROCEDURE

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.

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 (upstreamand 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.

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.

FIGURE 15

Note: DN 50 - 200 (NPS 2 - 8) valve illustrated.

21 20

CLARKSON FIGURE 952 KNIFE GATE VALVES

GLAND PACKING REPLACEMENT - DN 250 - 600 (NPS 10 - 24)

FIGURE 16

Note: DN 250 - 600 (NPS 10 - 24) valve illustrated.

FIGURE 17

PACKING REPLACEMENT

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)

leavingthe 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.

CLARKSON FIGURE 952 KNIFE GATE VALVES

GLAND PACKING REPLACEMENT - DN 250 - 600 (NPS 10 - 24)

PACKING PROCEDURE

NOTE

Care should be taken to stagger the mitred joints ineach 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 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. 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 thebody 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) atvalve 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 correctlygland nuts (8) may require adjustment. Pleaseensure to tighten equally.

2. 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.

CAUTION

Do NOT over tighten gland packing as it will cause excessive resistance to gate movement.

FIGURE 18

15 14

10 12

Note: DN 250 - 600 (NPS 10 - 24) valve illustrated.

23 22

5 20

CLARKSON FIGURE 952 KNIFE GATE VALVES

RTFE AND FKM SEAT REPLACEMENT

FIGURE 19

RTFE seat illustrated

RTFE SEAT REPLACEMENT

Seats are bonded into a 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) 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

(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. 5kg (10 lbs) on DN 50 - 200 (NPS 2 - 8) valves and approx. 15 kg (30 lbs) on DN250- 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 (referinstructions).

CLARKSON FIGURE 952 KNIFE GATE VALVES

RTFE AND FKM SEAT REPLACEMENT

FIGURE 20 FIGURE 21

Note: DN 50 - 200 (NPS 2 - 8) valve illustrated. Note: DN 250 - 600 (NPS 10 - 24) valve illustrated.

CLARKSON FIGURE 952 KNIFE GATE VALVES

HIGH TEMPERATURE VARIANT

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.

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.

Ø8 Padlock hole

Glandbox fasteners

Lockout pin

Extended glandbox stud

Glandbox

Valve body

Lockout

Gate

Clevis fasteners

F952

VCIOM-16488-EN © 2021 Emerson Electric Co. All rights reserved 09/21. Clarkson is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners.

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.

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