Flowserve Mach 1 - Manual (Page 10)

10
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User Instructions Mach 1 High Performance Plug Valve - DVENIM0300-01 - 03.13
NOTE: Part number reference is shown in Figure VI-1.
1. Normal procedures for field replacement of port seals or
sleeves are to be followed. Refer to V-A, steps 1-5, and V-B,
steps 1-8.
2. The fireseal top seal assembly differs from the standard Mach
1 top seal and is completed per the following instructions.
FIGURE VI-1
TyPICAL ASSEMBLy OF FIRESEAL MACh 1
3. The PFA diaphragm (Part 19) is to be flared on a tapered
bar just enough to slip over the plug stem (Fig. VI-2)
FIGURE VI-2
4. The PFA diaphragm is placed over the plug stem with the
lip down using the diaphragm guide (Figure VI-3). The
plug stem should be checked for nicks before installing
the PFA diaphragm. Nicks on this surface could result in
scratches on the lip of the diaphragm.
FIGURE VI-3
5. The metal diaphragm (Part 20) is placed over the plug
stem just far enough to enlarge the ID to conform to the
plug stem and then removed (Figure VI-4).
FIGURE VI-4
SECTION VI
ASSEMBLy SPECIFICATIONS - FIRESEAL VALVES 1"-6" MACh 1
16
14
12
10
9
8
7
20
19
4
3
2
1
11
13
15
18
17