V250 Valve
Instruction Manual
Form 5206
April 2004
8
Figure 4. Ball Seal Detail
W3701-1*/IL
Figure 5. Flow Ring Detail
W3700-1*/IL
construction will have no ball seal. For a dual seal
construction, repeat this procedure on the other end
of the valve.
4. Thoroughly clean all metal surfaces. Check all
parts for damage, and replace damaged parts with
new parts if necessary.
5. Proceed to the appropriate Installation procedure
to install the removed parts.
Installation of Single or Dual Ball Seal
1. Check the seal surface of the valve (key 1) for
scratches that may prevent the shim seals (key 10)
from sealing off internal valve pressures.
2. Rotate the ball (key 2) to the closed position as
indicated by the travel indicator scale (key 37,
figures 10 and 11 only).
3. Place the appropriate number of shim seals into
the valve:
D
For 4 through 10-inch valve sizes, insert up to 6
shim seals into the valve.
D
For 12 through 24-inch valve sizes, insert up to
7 shim seals into the valve.
4. Inspect the sealing surface of the ball seal (key
11) for possible damage. Then place the ball seal on
top of the shim seals with any nicks or scratches
facing away from the ball.
5. Add or remove the 0.25 mm (0.010 inch) thick
shim seals to the valve until the ball seal firmly
contacts the ball sealing surface (i.e., without
rocking) when pressed tightly against the shim seal
assembly.
6. Temporarily remove the ball seal, and remove 3
shim seals.
7. Replace the ball seal, and then place the O-ring
(key 13) into the valve.
Figure 6. Seal & Backup Ring Assembly
28B2099 / DOC
SEAL
CARRIERS
BACK-UP RING
INTERNAL
PRESSURE
SPRING LOADED
SEAL RING
8. With the ball seal centered on the ball, install the
seal protector ring (key 14) and secure it to the valve
with the cap screws (key 15).
9. For dual seal constructions, repeat this procedure
on the other end of the valve.
Installation of Flow Ring
1. Check the seal surface of the valve (key 1) for
scratches that may prevent the shim seals (key 10)
from sealing off internal valve pressures.
2. Rotate the ball (key 2) to the closed position as
indicated by the indicator scale (key 37, figure 11
only).
3. Place the appropriate number of shim seals into
the valve:
D
For 4 through 10-inch valve sizes, insert 6 shim
seals into the valve.
D
For 12 through 24-inch valve sizes, insert 7
shim seals into the valve.
4. Making certain the flow ring (key 14) is centered
and does not contact the ball, secure the flow ring to
the valve with the cap screws (key 15).
5. Measure the clearance between the flow ring and
the ball with a wire gauge. Add or subtract shim
