CAUTION
• DO NOT use solvents or abrasives on or near the valve body seat
ring.
Failure to follow this instruction could prevent the clapper from
sealing, resulting in improper valve operation and/or valve leakage.
5. Rotate the clapper out of the valve body. Inspect the clapper seal
and seal-retaining ring. Wipe away any contaminants, dirt, and
mineral deposits. Clean out any holes that are plugged in the
valve-body seat ring. DO NOT USE SOLVENTS OR ABRASIVES.
6. Inspect the clapper for freedom of movement and physical dam-
age. Replace any damaged or worn parts by following the appli-
cable instructions in the "Maintenance" section.
7. Re-install the cover plate by following the "Installing the Cover Plate
Gasket and Cover Plate" section.
8. Place the system back in service by following the "Placing the
System in Service" section.
MAINTENANCE
The following sections instruct on how to remove and replace internal
valve components. Care must be taken to avoid damage to parts during
removal and installation.
WARNING
• Depressurize and drain the piping system
before attempting to remove the cover plate
from the alarm check valve.
Failure to follow this instruction could result in
serious personal injury and/or property damage.
CAUTION
• Any activities that require taking the valve out
of service may eliminate the fire protection
provided.
• Before servicing or testing the system, notify
the authority having jurisdiction.
• Consideration of a fire patrol should be given
in the affected areas.
Failure to follow these instructions could result
in serious personal injury and/or property
damage.
REMOVING AND REPLACING THE CLAPPER SEAL FOR
DN80, DN100, AND DN150 SIZE VALVES
1. Perform steps 1 – 4 of the "Required Internal Inspection" section.
2. Remove the seal assembly bolt/bolt seal from the clapper.
I-751.VDS / Series 751 FireLock
™
European Alarm Check Valve Stations / Installation, Maintenance, and Testing Manual
I-751.VDS_14 REV_F
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