10-5
side of the disc and insert the shaft through the
body, bearings and disc.
5. Position the disc in the body, making sure it will
rotate in the proper direction with respect to the
body’s internal disc stop. Slide the shaft through
the body, bearings and disc.
CAUTION: Exercise care while sliding the shaft
into the sliding stem shaft bearings to avoid
damage to both the shaft and bearings.
6. Insert new taper pins and drive them firmly into
place in the side opposite the stop.
7. Slide the packing retainer, lower packing, packing
spacer, upper packing, and packing follower over
splined end of the shaft and into the body. Typical
packing configurations are shown in Figure 3.
NOTE: Always use new packing whenever rebuild-
ing the packing box.
CAUTION: Since the sealing on V-ring packing
takes place at the feather edge, it is important to
avoid damage to that edge.
8. Reinstall the end plug (or replace the end seal and
reinstall the bolted flange).
9. Reinstall the gland flange and packing nuts. Tighten
packing evenly to slightly over finger-tight.
CAUTION: Do not overtighten packing. This can
cause excessive packing wear and high shaft
friction, which may impede shaft rotation.
7. Push the packing and bearings out of the body
using a dowel of appropriate diameter. Push the
packing from the center of the valve.
Reassembling the Body
To reassemble the body sub-assembly, refer to Figures
1, 2, 3, and 5 and proceed as follows:
1. Clean all parts.
2. Check the disc seating surface to make sure it is
smooth and free of scoring and scratches.
CAUTION: Damaged or dirty seat surfaces can
cause excessive seat wear and high torque
requirements. Damaged discs should be re-
placed.
3. Inspect shaft for scratches or galled surfaces. For
maximum performance, Valdisk shafts are ma-
chined to a very smooth finish. If damage exists,
replace the shaft or contact factory representative.
NOTE: Disc and shaft are interchangeable in re-
cent designs. Replacing the disc does not require
replacing the shaft. Earlier designs require that the
disc and shaft be machined together. Contact the
factory for matched disc and shaft.
4. Insert new sliding stem shaft bearings into the body.
(A press may be required with some designs.)
NOTE: Earlier Valdisk designs require the disc to
be aligned in the body in such a way that it can
rotate properly. Align the shaft bearings on either
Figure 3: Typical Packing Configurations
SafeGuard / SureGuard
Fire-safe Option
(live-loading omitted)
SureGuard
Standard Square
Standard Single "V"
Twin "V"
SafeGuard
(packing studs rotated 45 degrees)
Twin "V" with Lubricator
