Packing Box; Packing Box (Optional Lubrication Figure 7) - GE Masoneilan 10000 Series Instruction Manual

C. Cut off the stem directly above the pin hole. (See Figure 6).
D. Rethread the stem the original amount.
Note: The area of the plug stem marked X in Figure 8, serves as a
guide and must be checked to ensure a close fit in the valve plug.
Stem Hole
Dia. Dia. "A"
Inches in mm
½
0,188 4,78
5 0,219 5,56
/
8
¾
0,250 6,35
1 0,312 7,92
E. Screw the stem solidly into the plug.
Note: This can be checked by measuring the depth of the pilot
recess in the plug (X in Figure 8), and making a reference mark
on the stem the same distance from the thread. When properly
assembled, the reference mark should be flush with the end of
the guide section.
F. Place the plug guide on a V block and using a suitable size drill,
drill the stem using the hole in the plug as a guide.
G. Remove any burrs from the plug guide by making a slight
counter bore.
H. Select the correct size pin, apply a small amount of grease on it
and press into the hole.
Note: The pin must be recessed approximately 1/16" below the
plug guide surface.
I. After the plug has been pinned it should be placed in a lathe to
ensure it is running true. If it is not, strike the plug with a soft
faced mallot to straighten.
Note: The plug should be placed in a collet with the plug guide
against it and the plug should be struck.
5 | GE Oil & Gas
Figure 7
"B" "X"
in mm in
1,250 31,75 0,50
1,562 39,67 0,62
1,875 47,63 0,75
2,500 63,50 1,00
Figure 8

6.5 Packing Box

Packing box maintenance is one of the principle chores of routine
servicing. Tightness of the packing is maintained by packing
compression. Compression is achieved by evenly tightening the
packing flanged nuts (2) against the packing flange (3). Care
must be taken not to over tighten, as this could prevent smooth
operations of the valve. If all compression is used up and the valve
leaks, new packing is required.
Valve must be isolated and pressure vented before performing
packing box maintenance.
Proceed as follows:
A. Loosen and remove packing flange nuts (2).
B. Raise packing flange (3) and packing follower (19) up the valve
stem.
C. Remove packing (17).
Note: Only the top pieces of the old packing are removable by
pulling them out the top of the bonnet. To remove all the packing
the bonnet must be removed. (See appropriate section)
D. Replace packing. As a rule, 2/3 of the packing rings are placed
below the packing spacer, and 1/3 above.
Note: Ensure packing is inserted with skives 90˚ apart on
successive rings.
E. Replace packing follower (19) and packing flange (3).
mm
F. Replace and tighten packing flange nuts (2).
12,7
15,7
19,1
25,4
Do not over tighten.
G. Put valve back in service and tighten packing only as much as is
necessary to stop leaking.
Note: In an emergency, string packing may be used as a
temporary repair only and must be replaced with the correct
packing as soon as possible.

6.6 Packing Box (Optional Lubrication Figure 7)

In some applications, packing boxes are designed for use with
a lubricator. The lubricator is provided with a ball check valve to
present backflow of the process fluid. On some valves, an isolating
valve (67) is added for positive protection against backflow. The
lubricator (66) should be kept filled with the specified lubricant and
turned in firmly but not tightly. One or two turns of the lubricator
once every two weeks should suffice to provide the desired seal.
Lubricants are available through your GE Representative or District
Office. Replacement of the packing (17) is accomplished in the
same manner as the standard lubricator box. Care must be taken
to ensure that the latern ring (18) is in line with the lube hole located
in the bonnet. As a rule, 2/3 of the packing rings are inserted below
the lantern ring and 1/3 above.
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