Instruction Manual
D104709X012
8540 Valve
September 2021
11
onto the studs only enough to stop leakage.
2. If the valve was equipped with a bonding strap assembly (figure 5), re‐install the assembly.
3. Refer to the Actuator Mounting section of this manual. If necessary, refer to the separate actuator instruction
manual for adjustment procedures.
4. When the control valve is being placed into operation, check around the packing follower for leakage.
Leakage from the PTFE packing can often be stopped by tightening the packing flange nuts just enough to stop the
leak.
CAUTION
Use caution when tightening the nuts. Overtightening the nuts can damage packing box parts and result in increased drive
shaft friction.
Seal Ring Maintenance
Perform this procedure if the control valve is not shutting‐off properly (if it is leaking downstream). It is recommended,
but not required, to remove the actuator for easier handling of the valve during the following procedures.
WARNING
The edges of a rotating disk close with 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
During any of the following steps, do not rotate the disk past 90 degrees in the open direction. Rotating the disk past 90
degrees can damage the seal ring.
Figure 7. Retainer Ring Knock‐Out Flat
FLAT END PUNCH
KNOCK-OUT FLAT
