Clarkson Manuals: Knife Gate Valves Figure 955/956 Gland Packing Instr Larger Sizes, Clarkson-EN Manuals & Guides
CLARKSON PORTED SLIDE GATE VALVES
FIGURE 955/956
DN 250 - 750 (NPS 10 - 30) gland packing replacement instructions for:
• F955 ported slide gate valves
• F956 dual gland ported slide 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 pre-cut packing
replacement kits for best results.
Ensure packing material selected is suitable for
the service.
Strip-down procedure:
1. Ensure the pipeline is not pressurized and
any hazardous medium is drained away.
2. Close valve, remove clevis split pins (18) and
clevis pins (17).
3. Use actuator or handwheel to raise spindle
clear of gate.
4. Remove all upstand bolts (12).
5. Remove actuator (19, 20) sub-assembly
(handwheel, upstand, gearbox and spindle
or cylinder actuator).
NOTE
Heavy valves will require a chain block or crane to
assist.
REPACKING PROCEDURE
NOTE
Care should be taken to stagger the mitred joints in
each layer of packing to the opposite side of the gland
follower, e.g.
• 1st packing layer joint to the front of the valve
• 2nd packing cord 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 cavity by hand, then repeat the
process with the packing cord (7) ensuring
the joints of the two layers are on opposing
sides of the cavity.
2. Firmly press the second layer of packing (6)
around gate and into gland cavity. The joint
should be on the opposite side of the gate to
the cord joint (ie the same side as the joint
in the first layer of packing (6).
6. Remove gland follower nuts (10) and
washers (11) then remove gland follower (3)
from gate (2).
7. Remove packing (6) and packing cord (7)
from gland cavity
8. Clean gland cavity.
9. Fit the gland follower over the gate (2).
10. If the gate has excessive irregularities or
abrasion and requires replacement, then
this will necessitate removal of the valve
from the pipeline, to prevent damage to the
valve seats (4).
11. For F956 valves repeat operations 6, 7 and 8
for the gland in the extension housing.
Gate (2)
Cord (7)
Packing
join
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Cord (7)
Packing
2ndlayer (6)
Packing
1stlayer (6)
Gate (2)
Cord join
Valve body (1)
VCIOM-02870-EN 19/09
5
16
2
6
6
9
10
17
30
29
20
28
25
CLARKSON PORTED SLIDE GATE VALVES
FIGURE 955/956
REASSEMBLY
1. Replace gland follower (3) onto the gate (2)
and push down until firmly on valve.
2. Coat stud (9) threads with anti-seize
compound. Replace the gland follower
washers (11) and gland follower nuts
(10) onto each stud (9), screw them down
equally, do not over tighten.
22
23
3. Refit the actuator sub-assembly (handwheel
and upstand, gearbox and spindle or
cylinder actuator) and replace both upstand
bolts (12) and upstand washers (13) and (14).
4. Use actuator (handwheel or pneumatic
actuator) to lower spindle to align clevis &
gate.
5. Insert clevis pins (17) and clevis split pins
(18), close valve
6. Assembly is complete, actuate to check all
is functioning as desired.
7. When commissioning, gland follower nuts
(10) may require tightening for final gland
packing adjustment.
8. For F956 valves repeat operations repacking
and reassembly procedures for the gland in
the extension housing (15).
CAUTION
Do NOT over tighten gland packing as it will cause
excessive resistance to gate movement.
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.
NOTE: F955 valve illustrated.
19
26
27
21
8
18
11
3
14
13
12
4
1
31
15
24
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