33
4.
Clean piston seating area of valve body and threaded
hole to make sure any debris is removed.
5.
Replace piston with a new, Victaulic-supplied assem-
bly. Make sure o-ring is installed flush to piston body.
6.
Tighten piston into valve body until metal-to-metal
contact occurs.
7.
Re-attach trim, per the applicable trim drawing.
8.
Place the system back in service by following the “Plac-
ing the System in Serivce” section, starting on page 11.
Replacing the Strainer Screen for
Series 79N Electric/Pneumatic
Actuators
1.
Remove the system from service by following steps 1-
10 of the “Required Internal Inspection” section, starting
on page 26.
2.
Remove the Series 79N Electric/Pneumatic Actuator
from the trim.
3.
Remove the strainer assembly from the Series 79N, as
shown above. Discard the strainer screen only.
4.
Use a new, Victaulic-supplied strainer screen. Insert
the strainer screen into the strainer assembly.
5.
Install the strainer assembly into the Series 79N care-
fully. Avoid damage to the o-ring seals.
6.
Re-install the Series 79N into the trim (refer to the
applicable trim drawing).
7.
Place the system back in service by following the “Plac-
ing the System in Service” section, starting on page 11.
• Make sure piston is reassembled and reinstalled
correctly.
Failure to do so could cause improper valve operation,
resulting in serious personal injury and/or property
damage.
• Depressurize and drain the piping system before
attempting to disassemble any Victaulic piping
products.
Failure to follow this instruction could result in
serious personal injury, property damage, and/or
product damage.
• DO NOT reuse strainer screens. When removed, the old strainer screen must be
replaced with a new, Victaulic-supplied screen.
Failure to follow this instruction could cause improper system operation, resulting in
property damage.
DISCONTINUED
PRODUCT
