Instruction manual

Instruction Manual

D500240X012

A31A Valve

October 2012

1. Remove the actuator and valve, as an assembly, from the pipeline, and then remove theactuatorfromthevalve.

Note

It is not necessary to remove the retaining ring and seal ring when removing the shaft(s) and disk.

2. Secure the valve in an upright position. Rotate the disk (key 2) 180 degrees counterclockwise from the fully closed

position by manually turning the drive shaft.

3. Removing the Anti-Blowout Protection (refer to figure 7):

a. For PTFE or Graphite Packing: Remove the hex nuts and pull off the packing flange. Remove the hex jam nuts and

theanti-blowoutflange.Removethepackingfollower.

b. For ENVIRO-SEAL Packing System: Evenly loosen and remove the two packing hex nuts, the packing flange, the

spring stack, the two hex jam nuts, the anti-blowout flange, and the packing follower.

4. Remove the anti-blowout ring from around the drive shaft using a needle nose pliers.

Note

NPS 3 through 12 v alves (CL150 and 300) have a bearing stop (key 8 , figure 8) pressed into the bearing bore immediately after the

packing box.

Do not attempt to remove the bearing stop which is found in the drive shaft bearing bore immediately after the packing box. The

bearingstopispressedintothebearingbore.Ifthebearingstopneeds replacement, contact your Emerson Process Management

sales office for more information.

5. Remove the packing from around the drive shaft.

Note

Different valves require slightly different procedures because different valve sizes/ pressure classes have different methods of

connectingthediskandshaft(s).Toidentifythe proper procedures, refer to the list below.

D CL150, NPS 3 through 8: One-piece shaft with 1 taper key.

D CL150, NPS 10 and 12: Two-piece shaft. 1 taper key in the drive shaft; 1 disk pin in the follower shaft.

D CL300, NPS 3 through 6: One-piece shaft with 1 taper key.

D CL300, NPS 8 and 10: Two-piece shaft. 1 taper key in the drive shaft; 1 disk pin in the follower s haft.

D CL300, NPS 12: Two-piece shaft with 2 tangential pins in the drive shaft; 1 disk p in in the follower shaft.

6. Proceed as appropriate, using the following instructions.

For valves with taper key(s), locate the taper key(s) (key 9, figure 8) which runs through the drive shaft boss on the

back of the valve disk. Using a pin punch on the smaller end of the key, drive it out of the disk and shaft. Driving a taper

key in the wrong direction will tighten it.

Note

Certain valve sizes may have a taper key that is arc spot welded in place. To remove the key, use a punch on the smaller end of the

taperkeyanddriveitoutofthediskandshaft,breakingtheweld.