Dyna-Flo Control Valve Services Ltd.
Phone: 780
•
469
•
4000 Toll Free: 1
•
866
•
396
•
2356 Fax: 780
•
469
•
4035 Website: www.dyna
fl
o.com
Model 380 Control Valve
(8 Inch Only)
P-388M0319A
6
Operation, Parts, and Instruction Manual
MAINTENANCE
(Continued)
Removing Actuator from Valve
(Continued)
2
Remove the stem connector (Refer to the Actuator
Instruction Manual for stem connector removal
instructions).
3
Support the actuator - the actuator may be able to be
removed manually on the smaller sizes. It is recommended
the lifting eyes attached to the actuator casing be used
(refer to Figure 3). If there are no lifting eyes, it is advisable
to remove 2 actuator casing cap screws, 180
o
apart, and
temporarily replace them with eye bolts and nuts. Position
the lifting straps through the lifting eyes or eye bolts to
avoid damage to the tubing and mounted accessories.
4
Remove the actuator mounting nuts (Key 32) and lift
actuator off of valve, store in a safe place.
5
Remove the jam nuts and travel indicator from the valve
stem.
Refer
to
the actuator manual for disassembly
procedures
for
actuators.
6
Once actuator has been removed from the valve the air
pressure in the actuator can be released.
(DFC
actuator
only)
NOTE:
For Actuator to Valve Mounting (Assembly) see
appropriate Actuator Instruction Manual.
Packing Maintenance
Refer to Figures 8 for packing orientation and Key numbers for
the following section. For live loaded packing instructions, refer
to the P-LLPS Instruction Manual.
For single (spring-loaded) packing:
A
Spring-loaded packing has constant force applied to the
packing set (Key 2) through a spring (Key 5) in the
packing bore. Ensure that the packing follower (Key 8) is
in contact with the bonnet (Key 1), if not tighten the packing
nuts (Key 12) until the packing follower comes in contact
with the bonnet. If this does not stop the leak then the
packing will need to be replaced. In some cases the bonnet
and/or stem (Key 17) may need to be polished or replaced.
B
Refer to
Valve Disassembly
section for Packing Removal
and
Inspection.
CAUTION:
Do not tighten the packing nuts past the
recommended maximum torque value as this will cause high
stem friction and could cause the valve to operate incorrectly.
For double packing / graphite ring packing:
A
Double packing consists of two packing sets (Key 2)
separated by a lantern ring (Key 6). Both styles of packing
require that the packing nuts (Key 12) be kept tight to keep
force on the packing. If leakage is detected from the
packing, the packing nuts can be tightened to apply more
force on the packing set (make sure not to exceed the
maximum allowable torque values, refer to Table 2). If this
does not seal off the leak then the packing will need to be
replaced. In some cases the bonnet (Key 1) and/or stem
(Key 17) may need to be polished or replaced.
B
Refer to Valve Disassembly section for Packing Removal and
Inspection. Refer to Figure 8 for double and graphite
packing
arrangements.
Figure 3
Actuator Lifting Suggestions
Figure 4
Actuator Mounting Nuts and Bolts
32
33
LIFTING STRAP
xx
