Flowserve TSQVIOM Durco Mach 1 Severe Service Valve IOM - Manual (Page 10)

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6. Install the diaphragm over the plug stem.
The diaphragm guide must be used to
install the diaphragm. Make sure there are
no nicks on the guide. Place the diaphragm
over the guide and push downward over the
guide. See Figure 7. Push the diaphragm
down using the diaphragm pusher.
Figure 7
7. Remove the diaphragm guide and
pusher from the stem. Place the
diaphragm gland over the plug stem.
Now locate and seat the diaphragm
gland by pushing downward with the
diaphragm gland pusher. (An arbor
press is required to load the pusher.)
See Figure 8.
8. At this time, tap pusher with soft
mallet for weld-end valves. Then
apply a light coat of silicone, or
approved lubricant, to the packing
area of the plug stem and the seat
area of the top cap stuffing box.
Figure 8
9. The packing is then placed into the
stuffing box as shown in Figure 9.
Several packing orientations are
shown in an earlier section. Under no
circumstances shall sharp objects
such as screw drivers, cold chisels or
knives be used to force the packing
into the stuffing box. The packing
gland may be used to start the packing
into the stuffing box.