Table of Contents
Advertisement
Control-Disk Valve
June 2017
Figure 3. Optional Shaft‐to‐Valve Body Bonding Strap Assembly
Packing Maintenance
Refer to figure 4 for available packing configurations. All maintenance operations in this section may be performed
with the valve in the line. Packing may be PTFE V‐ring or graphite.
An ENVIRO‐SEAL packing system is also available with the Control‐Disk valve. To install the ENVIRO‐SEAL packing
system in an existing valve, follow the instructions in the instruction manual included with the packing system
(D101643X012). To remove packing parts in a valve with the ENVIRO‐SEAL packing system, follow the procedures for
valves with the ENVIRO‐SEAL packing system in this section. Install the replacement packing following the instructions
in the packing system instruction manual (D101643X012).
Stopping Leakage
For valves with PTFE or graphite packing:
CAUTION
Tighten the packing flange only enough to prevent shaft leakage. Excessive tightening will only accelerate wear of the
packing and could produce higher torques on the valve.
Leakage around the packing followers can be stopped by tightening the packing flange nuts (key 28, figure 10).
If the packing is relatively new and tight on the shaft, and if tightening the packing flange nuts does not stop leakage,
the shaft may be worn or nicked so that a seal cannot be made. If the leakage comes from the outside diameter of the
packing, the leakage may be caused by nicks or scratches around the packing box wall. Inspect the shaft and packing
box wall for nicks and scratches when performing the packing replacement procedures.
For valves with the ENVIRO‐SEAL packing system:
Optimum performance of the ENVIRO‐SEAL packing system is obtained when the Belleville springs are tightened to
their "target load." The target load is the point where the springs are compressed to 85% of their maximum deflection,
or nearly flat. Maximum deflection is when the springs are 100% compressed, or completely flat.
8
Instruction Manual
D103298X012
Advertisement
Table of Contents
