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Instruction Manual
Form 5206
April 2004
4. Insert the washer (key 24) into the ball. Lubricate
the exposed surface of the washer with a good
quality grease or lubricant.
CAUTION
Improper tightening of the shaft
retainer (key 25) could allow the shaft
retainer to become disengaged from
the drive shaft (key 6) during operation
of a Design V250 control valve
assembly. This could cause damage to
the valve assembly and downstream
equipment. To prevent such damage,
make sure that the shaft retainer is
tightened to the appropriate torque
value listed in table 4.
5. Apply Loctite Primer N or T and Loctite No. 271
or equivalent sealant (key 30) to the threads of the
shaft retainer (key 25). Then, install the shaft
retainer into the inside end of the drive shaft. Tighten
the shaft retainer to the torque value listed in table 4.
CAUTION
Damage to the valve assembly and
downstream equipment could occur if
the retainer screw (key 32) should
become disengaged from the follower
shaft (key 7) during operation of a
Design V250 control valve assembly.
To prevent such damage, make sure
that the internal threads in the inside
end of the follower shaft and the
external threads of the retainer screw
are cleaned thoroughly before
applying Loctite Primer N or T and
Loctite No. 271 or equivalent sealant
(key 30) as described in step 8 of this
assembly procedure.
6. While maintaining firm support of the ball (key 2),
remove the ball support post through the follower
shaft bore of the valve. Then install the follower shaft
into the valve. When installing the follower shaft,
make sure that the drilled hole containing the two
pins (key 9) is aligned with the two notches
machined on the inside surface of the ball hub.
7. Temporarily position the follower shaft so that it
protrudes slightly into the flow bore of the ball. Place
the split ring (key 31) on the end of the follower
shaft. Then, return the follower shaft to its original
position.
CAUTION
Improper tightening of the retainer
screw (key 32) could allow the retainer
screw to become disengaged from the
follower shaft (key 7) during operation
of a Design V250 control valve
assembly. This could cause damage to
the valve assembly and downstream
equipment. To prevent such damage,
make sure that the retainer screw is
tightened to the appropriate torque
value listed in table 4.
8. Apply Loctite Primer N or T and Loctite No. 271
or equivalent sealant (key 30) to the threads of the
retainer screw. Then, install the retainer screw into
the inside end of the follower shaft until it is at least
flush with the end surface of the follower shaft. Make
sure that the drilled hole containing the two pins (key
9) is still aligned with the two notches machined on
the inside surface of the ball hub. Tighten the
retainer screw to the torque value listed in table 4.
9. Install the thrust spacer (key 21) into the follower
shaft side of the valve and position it so that it is in
contact with the ball hub. Then, install the thrust
washer (key 19) and the bushing (key 20).
10. Center the ball inside the valve along the axis of
both the drive shaft and the follower shaft. The
maximum deviation in measurement between the
valve and ball from one side to the other should be
no more than 0.005 inches (0.127 mm) as shown in
figure 9.
11. In order to maintain proper centering of the ball
inside the valve, the bushing spacer shims (key 18)
must be installed in the following manner.
D For the drive shaft side of the valve, install
several bushing spacer shims around the drive shaft
and into the valve. Then, temporarily install the
spacer (key 22) and the seal carrier (key 17). Repeat
this process, but add only one more bushing spacer
shim into the valve each time, until contact between
the seal carrier and the valve is broken. Then,
remove one bushing spacer shim and secure the
spacer and seal retainer to the valve with the hex
nuts (key 8). Be careful not to damage the seal (key
16) or O-ring (key 23) during replacement of the seal
carrier.
D For the follower shaft side of the valve, install
several bushing spacer shims around the follower
shaft and into the valve. Then, temporarily install the
spacer (key 22) and the seal carrier (key 3). Repeat
this process, but add only one more bushing spacer
shim into the valve each time, until contact between
V250 Valve
13
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