Val-Matic Swing-Flex Check Valve Operation, Maintenance And Installation Manual page 5

BACKFLOW ACTUATOR FIELD INSTALLATION AND MAINTENANCE (OPTIONAL)
BACKFLOW ACTUATOR OPERATION:
An optional backflow actuator assembly is
available which can be easily installed in the field.
The actuator is not designed to operate at the
valve's Maximum Working
Therefore, prior to using the actuator, close the
pump isolation valve and bleed off line pressure.
To operate, turn the handle clockwise. This will
open the valve disc allowing backflow through the
valve. The handle should turn easily. When the
actuator is fully extended into the valve, the disc
will be partially open. Upon completion of the back
flushing operation, turn the handle counter-
clockwise and the valve will automatically return to
the closed position.
closed position with the jam nut provided. The
system is again ready for normal operation.
WARNING
Relive line pressure before using backflow
actuator or damage may occur.
BACKFLOW ACTUATOR FIELD INSTALLATION:
The backflow actuator is supplied as an optional
assembly from the factory, which is shipped loose
with the valve.
WARNING
Remove of the bottom plug while under
pressure may cause bodily harm.
1. Depressurize and drain the pipeline.
2. Score the coating around and remove the pipe
plug in the bottom boss of the valve.
3. Inspect the backflow rod and place in the non-
extended position. (The rod should extend
about 1" past the end of the brass bushing.)
Apply Teflon thread sealant to brass threads.
4. Insert the threaded end of the assembly into
the valve boss. Slowly turn the assembly into
the boss taking care not to cross-thread the
bushing. Continue turning the assembly into
the valve for a tight fit.
BACKFLOW ACTUATOR SEAL REPLACEMENT:
There are two parts (8 & 9) on the backflow
actuator that are subject to wear. To replace the
seals, the pipeline must first be depressurized and
drained. Next, remove the backflow assembly
from the valve by turning the brass bushing (6)
counter-clockwise. Disassemble the actuator as
follows:
Pressure rating.
Lock the actuator in the
1. Remove one of the vinyl caps (12).
2. Remove the T-Handle (10) and jam nut (11)
from the rod (7).
3. Remove the rod (7) from the bushing (6) by
screwing in the rod fully clockwise and pull the
rod through the valve end of the bushing (6).
4. Lubricate new seals with FDA approved grease
such as Lubriko #CW-606 and install in the
bushing end grooves.
5. Clean, lubricate, and reinstall rod in bushing.
6. Re-install jam nut (11) and T-Handle (10).
7. Place vinyl cap (12) on handle (10).
8. Apply Teflon thread sealant to bushing and
carefully thread into valve taking care not to
cross-thread the bushing.
FIGURE 3. BACKFLOW ACTUATOR ASSEMBLY
Backflow Actuator Parts List
Item Description
6 Bushing
7 Rod
8 Rod Wiper*
9 O-Ring*
10 Handle
11 Jam nut
12 Cap*
*Recommended Spare Part
Material
Lead-Free Brass
Stainless Steel
Molythane
Buna-N
Stainless Steel
Brass
Vinyl