Flowserve Valtek Mark 14 - Manual (Page 8)

Valtek Mark 14 Control Valves FCD VLENIM0115-00 – 06/06

5.7 Ensure all accessories, brackets and bolting are securely fastened.
5.8 If possible, remove air supply and observe actuator for correct fail-safe action.
5.9 Check rubber actuator bellows for splits, cuts or wear.
5.10 Spray a soap solution around the actuator cylinder retaining ring and actuator stem guide to
check for air leaks through the O-rings.
5.11 Clean any dirt and other foreign material from the plug stem.
5.12 If an air filter is supplied, check and replace cartridge if necessary.
6 Disassembly and Inspection
To disassemble Mark 14 control valves refer to Figure 4 and 5 and proceed as follows:
WARNING: Depressurize line to atmospheric pressure and drain all fluids before working on the
valve. Failure to do so can cause serious injury.
6.1 Remove the air supply from the actuator. Remove the split stem clamp and yoke bolts. Then
remove the actuator from the body sub-assembly by lifting the actuator straight up.
CAUTION: Heavy actuators will require a hoist. Lift the actuator with the yoke legs using a lifting
strap and a hoist. Care should be taken to lift the actuator straight off the body to avoid damage.
WARNING: When lifting actuators, be aware that the center of gravity may be above the lifting
point. Support must be given to prevent the actuator from rotating. Failure to do so can cause
serious injury to personnel and damage to the actuator and nearby equipment.
6.2 Remove the gland flange bolting and the gland flange from the bonnet.
6.3 Loosen the bonnet flange socket head bolting and remove the bolts and the disk springs
underneath them.
6.4 Remove the bonnet flange.
6.5 If the bonnet has not dropped down to the body/bonnet shelf, push or tap the bonnet with a
rubber mallet until it drops down enough to allow removal of the segmented bonnet retaining
ring.
6.6 Remove the four pieces of the bonnet retaining ring, smaller pieces first. If needed, place a
¼" rod or punch tool through the holes in the body and knock the retaining ring segments in
towards the bonnet. Refer to Figure 1 to determine the order of removal.
Figure 1 – Bonnet and Seat Retaining Rings
c
a
c
Remove First
Install Last
Figure 3, Bonnet and Seat Retaining Rings
Remove First
Install Last
Figure 3, Bonnet and Seat Retaining Rings