Flowserve Valtek Torex TX IOM - Manual (Page 8)

Torex TX VLEEIM4143-02 09.10
8
9.6.2 Boxpacking Zebra-CL™
The sealing requires inspection and adjustment when the
valve is taken into operation.
Ensure that the valve is free of pressure.
1. Dismount the actuator.
2. Remove the nuts (29). Lift off the gland cover
(23). Then remove the boxpacking set (24) and
the o-ring (18).
3. Clean the stem surfaces, gland cover (23) and
the recess in the valve body.
4. Inspect the stem surface thoroughly. It should be
free from marks and scratches.
5. Lubricate the stem with suitable lubrication.
6. Replace the boxpacking set (24) and the greased
o-ring (18). Then mount the gland cover (23)
and nuts (29).
7. Tighten the nuts (29) until the boxpacking gets
in place and is in contact with both the stem and
valve body. Check the tightness of the box-
packing and retighten the nuts (29) – if
necessary - when the valve is taken into
operation.
9.6.3 Boxpacking SafeGuard
The sealing requires inspection and adjustment when the
valve is taken into operation.
Ensure that the valve is free of pressure.
1. Dismount the actuator.
2. Remove the nuts (29) and the cup spring (22).
Lift off the gland cover (23). Then remove the
boxpacking and the o-ring (18).
3. Clean the stem surfaces, gland cover (23) and
the recess in the valve body.
4. Inspect the stem surface thoroughly. It should be
free from marks and scratches.
5. Lubricate the stem with suitable lubrication.
6. Replace the boxpacking and the greased
O-ring (18). Then mount the gland cover (23)
and nuts (29).
7. Tighten the nuts (29) until the boxpacking gets
in place and is in contact with both the stem and
valve body. Check the tightness of the packing
and retighten the nuts (29) – if necessary - when
the valve is taken into operation.
9.7 To change the packing, item No. 9
Ensure that the valve is not under pressure.
1. Remove the Retaining (7) and gasket (9).
2. Carefully clean the retaining (7) and the lower,
loadcarrying part of the stem (5).
3. Fit a new gasket (9).
4. Spray locking compound, such as Loctite 641,
onto the screw threads in the valve body.
5. Fit and tighten the retaining (7).
10. To replace the stems and the
valve disc
If the valve disc (2) or stems (4) and (5) have been damaged
and need replacing, the valve must be sent to NAF for repair,
since special tools and fixtures are necessary for correct
assembly.
11. Fitting the actuator to the valve
1. The actuator can be mounted directly on the
valve. The mounting flange and the stem of the
valve follow the NAF standard for securing the
actuator.
2. Turn the valve to the closed position (clockwise),
although without applying a closing torque. (The
valve disc should then only just be in contact
with the seal ring in the valve body.)
3. Fit the actuator. The actuator should be in the
”almost closed” position, i.e. 5 - 8° of the
rotary travel of the actuator should remain before
the end position. Adjust the end position stop of
the actuator to this almost closed position.