Instruction Manual

Instruction Manual

D103298X012

Control-Disk Valve

May 2011

3. Loosen the two packing hex nuts evenly to remove spring tension, then remove the nuts.

4. Remove the packing flange and spring pack assembly. The spring pack assembly consists of the spring stack and

packing follower. The spring stack is retained on the packing follower by an O‐ring. Remove the anti‐blowout ring

(key 40) from the driveshaft (key 10). Remove the anti‐extrusion washer, the packing set, and the packing ring.

CAUTION

The valve shaft surface condition is critical in making and maintaining a good seal. If the valve shaft surface is scratched,

nicked, dented, or worn, replace the valve shaft before replacing the packing system.

5. Inspect the existing valve shaft. If necessary, replace the valve shaft as described in the Replacing the Disk, Shafts,

or Bearings section.

6. Install the new packing system components as described in the ENVIRO‐SEAL Packing System for Rotary Valves

Instruction Manual (D101643X012).

7. Install the anti‐blowout ring (key 40) onto the drive shaft (key 10) before installing the packing follower.

8. Mount the actuator and adjust the closed position of the valve, per the Actuator Mounting section on page 18 of

this manual, before returning the valve to service.

Replacing the Seal Ring Assembly

Perform this procedure only if the control valve is not shutting off properly (that is, leaking downstream). This

procedure does not require removing the actuator from the valve body.

Key numbers in this procedure are shown in figure 11 unless otherwise indicated.

1. Isolate the control valve from line pressure, and relieve pressure from the valve body. Shut off and disconnect all

lines from the power actuator.

WARNING

The edges of a rotating disk have a shearing effect that may result in personal injury. To help prevent such injury, stay clear

of the disk edges when rotating the disk (key 3).

CAUTION

Damage to the disk (key 3) may occur if the disk is not closed when the valve is being removed from the pipeline. If

necessary, apply operating pressure to the actuator temporarily to retain the disk in the closed position while removing the

valve from the pipeline.

2. Unscrew the flange bolts, and remove the valve from the pipeline.

3. Unscrew the machine screws (key 14), remove the retainer clip (key 13), and remove the seal retainer (key 2).

4. Remove the seal ring assembly (key 4).

5. The valve must be closed during seal ring installation to permit accurate centering of the seal. To install the new

seal ring assembly:

D For a soft seal, if the spring (key 5) was disassembled, hook the spring ends together. Work the spring into the

recess in the seal ring (key 4). Place the seal ring assembly onto the disk. Set the retainer onto the seal, making sure

proper alignment between the seal and retainer has been achieved.