Victaulic FireLock 756 Series User Manual

REMOVING AND REPLACING THE PISTON ASSEMBLY
CAUTION
DO NOT extend the piston manually. Manually extending the
piston could damage the internal diaphragm.
Failure to follow this instruction could result in improper valve
operation and/or valve leakage.
•
1. Remove the system from service by following steps 1 – 6 of the
"Required Internal Inspection" section, starting on page 26.
2. Disconnect the trim from the piston. Refer to the applicable trim
drawing for details.
3. Remove the piston from the valve body.
4. Clean the back of the valve body to remove any debris that may
interfere with proper piston seating.
5. Replace the piston with a new, Victaulic-supplied assembly. Make
sure the o-ring is installed flush to the piston body. Tighten the
piston into the valve body until metal-to-metal contact occurs.
CAUTION
Make sure the piston is reinstalled cor-
rectly.
Failure to follow this instruction could cause
improper valve operation, resulting in prop-
erty damage.
•
6. Re-attach the trim to the piston. Refer to the applicable trim
drawing for details.
7. Place the system back in service by following the "Placing the
System in Service" section, starting on page 11.
REPLACING THE STRAINER SCREEN FOR SERIES 776 LOW-
PRESSURE ACTUATORS
1. Remove the system from service by following steps 1 – 6 of the
"Required Internal Inspection" section, starting on page 29.
2. Remove the Series 776 Low-Pressure Actuator from the trim. Refer
to the applicable trim drawing for details.
3. Remove the strainer assembly from the Series 776 Low-Pressure
Actuator, as shown above. Discard the strainer screen only.
CAUTION
DO NOT re-use strainer screens. After removal, the old
strainer screen must be replaced with a new, Victaulic-
supplied screen.
Failure to follow this instruction could cause improper valve
operation, resulting in property damage.
•
4. Use only a new, Victaulic-supplied strainer screen. Insert the
strainer screen into the strainer assembly.
5.
Install the strainer assembly into the Series 776 Low-Pressure
Actuator carefully. Avoid damage to the o-ring seals.
6. Re-install the Series 776 Low-Pressure Actuator into the trim.
Refer to the applicable trim drawing for details.
7. Place the system in service by following the "Placing the System in
Service" section, starting on page 1.
I-756LPA.VDS_30
FireLock
®
European Dry Valve Stations
SERIES 756
WITH SERIES 776 LOW-PRESSURE ACTUATOR
I-756LPA.VDSINSTALLATION, MAINTENANCE, AND TESTING MANUAL
www.victaulic.com
VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2006 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
REV_B
DISCONTINUED PRODUCT

Victaulic FireLock 756 Series Specifications

General

Brand	Victaulic
Model	FireLock 756 Series
Category	Control Unit
Language	English