Anti-Blowout Protection, Packing, Valve Shaft(S), Disk, And Bearing Maintenance - Emerson Fisher POSI-SEAL A31A Instruction Manual

A31A Valve
February 2019
Figure 7. Anti‐Blowout Protection Detail
PACKING FLANGE
(KEY 11)
ANTI-BLOWOUT
FLANGE
(KEY 10)
VALVE BODY
EXTERNAL DETAILS
C0766
Anti‐Blowout Protection, Packing, Valve Shaft(s), Disk, and Bearing
Maintenance
Note
The NPS 10 through 12 CL150 valves and NPS 8 through 12 CL300 valves have a two‐piece shaft. The shaft with the keyed end is
called the drive shaft. The shaft opposite the drive shaft is called the follower shaft.
The NPS 3 through 8 CL150 valves and NPS 3 through 6 CL300 valves have a one‐piece shaft. This one‐piece shaft is keyed and is
called the drive shaft.
Removal
WARNING
The edges of a rotating valve disk (key 2) have a shearing effect that might result in personal injury. To avoid personal
injury, keep clear of the disk edges when rotating the disk.
CAUTION
When removing the actuator from the valve, do not use a hammer or similar tool to drive the lever off the valve shaft.
Driving the lever or actuator off the valve shaft could damage the valve internal parts.
If necessary, use a wheel puller to remove the lever or actuator from the valve shaft. It is okay to tap the wheel puller screw
lightly to loosen the lever or actuator, but hitting the screw with excessive force could also damage internal valve parts.
Never use a wrench or pliers on the drive shaft. A damaged shaft could cut the packing and allow leakage.
Unless otherwise indicated, key numbers and part names are listed in figure 8.
18
PACKING FLANGE
STUD (KEY 14)
(KEY 11)
AND HEX NUT
PACKING
(KEY 15)
FOLLOWER
HEX JAM NUT
(KEY 12)
(KEY 17)
TYPICAL
PACKING
(KEY 13)
CUTAWAY, NPS 3 THROUGH 12
Instruction Manual
D500240X012
ANTI-BLOWOUT
RING (KEY 16)
ANTI-BLOWOUT
FLANGE
(KEY 10)
VALVE BODY