Y690VB Series
3
To Convert Constructions
The Type Y690VB to the Type Y690VBM:
New parts required: keys 30, 31, and 33
1. Remove pipe plug (key 27) from the diaphragm
casing (key 4).
2. Refer to steps 1 and 4 in the Body Area
Maintenance section.
3. Insert the throat seal (key 31, figure 4) and machine
screw (key 33, figure 4).
4. Insert the stem seal (key 30, figure 4) by following
steps 1 through 6 and 8 through 11 in the Diaphragm and
Spring Case Area Maintenance section.
5. Reassemble following steps 5, 6, and 7 of the Body
Area Maintenance section.
• Replace the To Convert Constructions section on page 5 with the following:
The Type Y690VBM to the Type Y690VB:
New parts required: key 27
1. Insert pipe plug (key 27) in the diaphragm casing
(key 4).
2. Follow steps 1 through 6 and 8 through 11 in the
Diaphragm and Spring Case Area Maintenance section
to remove the stem seal (key 30, figure 3).
3. Follow steps 1 and 4 of Body Area Maintenance to
remove the throat seal (key 31, figure 4) and machine
screw (key 33, figure 4).
4. Reassemble following steps 5, 6, and 7 of the
Body Area Maintenance section.
• Add the following figure:
Figure 5. Expanded View of the Body Area
Showing the Body Seal O-RIng and Backup Ring Placement
BODY SEAL
O-RING (KEY 11)
BACKUP RING (KEY 50)
BODY (KEY 1)
