Flowserve Marathon-Mach 1 - Manual (Page 11)

11
Flow Control Division
Section 1.0
8. Using the diaphragm guide (Part Series BY86272A) to
protect the o-ring from the stem edge, install the first
o-ring by “rolling” it with your fingers over the guide and
into the lower stem groove (Figure VI-4). Install Teflon
split ring in a similar manner such that it is located above
the o-ring inside the lower groove.
9. Install second o-ring and split ring in upper groove in a
similar manner, except that the diaphragm guide should
be raised by hand so that the lower edge of the guide
does not contact the lower o-ring assembly. Remove
the guide. Coat both o-ring assemblies liberally with
Krytox ® grease.
10. The thrust gland is then assembled over the plug and
driven into place using the thrust gland guide, part series
BY90431 and arbor press.
11. The entire assembly is turned over and the Grafoil gasket
placed on the metal diaphragm. A small amount of rubber
cement is placed on the Grafoil in several places to cause
it to adhere to the metal diaphragm.
12. Continue to assemble the valve per Section V-A,
beginning at step 13.
SECTION VI
FIGURE VI-4