Flowserve Valtek ShearStream HP Control Valves - Manual (Page 7)

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User instructions - Shearstream HP - VLENIM0027-01 03.08
7
CAUTION: Be extremely careful not to gall or scratch the
sealing surface of the ball when removing it from body.
Scratches may later cause excessive leakage and seal
wear.
8..6 Push packing and bearings out of the body using a bronze
dowel with the appropriate diameter. Push packing out of the
body from the center of the valve. (See Table IV for optional
shaft/post bearing tool.)
8.2 Reassembling the Body
To reassemble the body subassembly, refer to Figures  or
, 3, 4, and 5 and proceed as follows:
8.. Clean all parts and replace all O-rings and soft seals.
8.. Check the ball sealing surface to make sure it is smooth and
free of scoring and scratches.
CAUTION: Damaged or dirty seal surfaces can cause exces-
sive seat wear and high torque requirements. Damaged
balls should be replaced.
8..3 Inspect the shaft and post for scratches or galled surfaces. For
maximum performance, ShearStream shafts and posts are
machined to a very smooth finish. If damage exists, replace
the shaft or contact the factory representative.
NOTE: Ball and shaft are interchangeable. Replacing the ball
does not require replacing the shaft.
8..4 Using a press to install new bearings in the body and/or ball
is recommended. (An optional post/bearing tool is available
from the factory. See Table IV.) When correctly installed, the
ends of the body bearings should be flush with the inside of
the body.
8..5 Position the ball in the body by lowering it, splined hole first,
into the back of the body. Rotate the ball surface toward the
front of the body so that the splined hole is toward the packing
box.
CAUTION: Be extremely careful not to gall or scratch the
sealing surface of the ball when replacing it in the body.
Scratches may later cause excessive leakage and seal
wear.
8..6 On 3 – -inch and 6-inch designs, insert the shaft through
the outboard end of body and through the splined hole of
the ball into the packing box. On  – -inch designs, insert
the shaft through the inboard end of body and through the
packing box into the splined hole of ball. (For -inch body
designs, the thrust bearing, packing spacer, packing, and
packing follower must be inserted before installing shaft.)
8..7 Position the shaft so that the pin hole in the shaft and ball are
in alignment. (Some shafts have a half circle mark and line
on the end. Align the line mark with the pin and the half circle
symbol with the ball.) Install the shaft pin and drive it firmly
into place so that half is in the ball and half in the shaft.
8..8 On rotating post designs, Insert the post through the outboard
end of the body and into the hole of the ball. (For  – -inch valves
sizes, insert thrust bearing before installing post.) Position the
post so that the pin hole in the post and ball are aligned. (For
6 – -inch and 6-inch valve sizes, be certain that the ball
pin hole is aligned with the smallest diameter pin hole in the
post. Some posts have a half circle mark on the end. Align
this mark with the ball.) Install the post pin and drive it firmly
into place so that half is in the ball and half is in the post.
Torque the plug per Table II.
Standard
Single "V"
Standard
Twin Square
Twin "V"
Twin Square
with Lubricator
Twin "V"
with Lubricator
SafeGuard / SureGuard
Fire-safe Option
SafeGuard Live-loading
SureGuard
(packing studs
rotated 45 degrees)
(live-loading omitted)
Figure 3: ShearStream HP Packing Configurations