Flanged Ball Valves
4
H24 Series
9. DISASSEMBLY
The following instructions are for off-line disassembly of
valves sizes
1
⁄
2
” to 1
1
⁄
2
”
9.1.
Cycle the valve with the line pressure fully relieved before
attempting to remove the valve from the pipeline, to insure
pressure has also been discharged from the valve cavity.
9.2.
Bring the valve handle to the open position.
9.3.
Remove the valve from the pipeline using appropriate
wrench (see table 2).
9.4.
Inspect the valve interior through the end ports to determine
it is clean and free from foreign matter.
9.5.
Clamp the valve in a vice, pull the safety pin out and release
the end connector.
9.6.
Remove and discard the body seal and seats. Be careful not
to damage the sealing surfaces.
9.7.
Turn the handle to the closed position to enable removal of
the ball. Carefully slide the ball out .Set the ball aside in clean
secure area for reuse.
9.8.
Remove the wrench nut, serrated washer, handle, locking
clip, gland nut, disk springs and gland. Place all components
removed, in clean secure area.
9.9.
Push the stem down into the body and remove it. Discard
the stem thrust ring and packing, care taken not to scratch or
nick the packing bore area of the body. Clean the stem and
packing bore area.
9.10.
Remove and discard the second seat.
10. ASSEMBLY
The following instructions are for off-line assembly of valves
sizes
1
⁄
2
” to 1
1
⁄
2
”
10.1.
Insert one new seat ring into the valve cavity with its round
profile facing up.
10.2.
Lubricate the new stem thrust ring and packing, with
appropriate lubricant (Molycote 33 - thin smear). Place the
stem thrust ring on the stem.
10.3.
Insert the stem horizontally into the center body with the
threaded side first and carefully guide it up through the stem
bore.
10.4.
Holding the stem up insert the new packing over the stem and
into the stem bore. Place the follower and two disk springs
(face to face) onto the stem.
10.5.
Thread the stem nut onto the stem. Tighten the stem nut to
the torque figures (table 1).
10.6.
Place the locking clip on the stem nut by adjusting the
orientation of the nut (in the clockwise direction).
10.7.
Place the handle, serrated washer and thread the handle nut
on the stem. Holding the handle tighten the handle nut tight.
10.8.
Bring the handle to the closed position and insert the ball in
the valve cavity until the stem tounge is engaged to the ball
slot and the ball is nested in the seat.
10.9.
Place the new body seal and seat ring into the valve body.
10.10.
Screw back the end connector using the proper wrench and
tighten according to table 2.
10.11.
Place the safety pin in its hole. Use an hammer to insert the
pin inside. Refer to the installation instructions in section 5 of
this manual to complete the valve assembly to the line.
TABLE 1
Stem Nut Tightening Torque
Full Bore
Nut Thread
* PTFE Gland
Packing
Graphite Seal
Hermetix™
Nm
in.lb
Nm
in.lb
Nm
in.lb
½”- ¾”
3/8” - 24 UNF
4
35
6
53
6
53
¾”
3/8” - 24 UNF
4
35
6
53
6
53
1”
7/16” - 20 UNF
9
80
11
97
11
97
1¼”
7/16” - 20 UNF
9
80
11
97
11
97
1½”
9/16” - 18 UNF
13
115
16
140
15
133
*
These torque figures are applicable on other stem seal materials
such as glass filled PTFE, UHMWPE and TFM.
IMPORTANT:
An excessively tightened stem nut can cause excessive packing wear
and increase stem torque.
TABLE 2
End Connector Tightening Torque
Size
Nut
Thread
Tightening
Torque
Hexagon
Dimensions
Nm
in.lb
mm
inch
½”
1
1
/
8
” – 18 UNEF-2A
120
1060
30
1.18
¾”
1
7
/
16
” – 18 UNEF-2A
150
1330
40
1.57
1”
1
7
/
8
” – 16 UN-2A
180
1600
50
1.97
1 ¼”
2
1
/
4
” – 20 UN-2A
210
1860
60
2.36
1 ½”
2
5
/
8
” – 16 UN-2A
240
2100
70
2.75