Keystone Knife Gate Valves F952 Gland Packing Instructions Larger Sizes, Keystone-EN Manuals & Guides

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KEYSTONE KNIFE GATE VALVES

FIGURE 952

Gland packing replacement instructions for DN 250 - 600 (NPS 10 - 24)
Figure 952 knife gate valves

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.

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

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”) 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).

NOTE

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.

Emerson.com/FinalControl VCIOM-02045-EN 16/02

© 2017 Emerson. All Rights Reserved.

KEYSTONE KNIFE GATE VALVES

FIGURE 952

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.

11. 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

12. 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.

NOTE

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.

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

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