Watts LF007 Serie Manuel D'installation, D'entretien Et De Réparation page 3

Servicing the Check Valves
No special tools are required to service the assembly.
1. Remove cover bolts and cover.
2. Remove the retainer from the body bore. The check valve
modules can be removed from the valve by hand or with
a screwdriver.
3. The check seats are attached to the cage with a bayonet type
locking arrangement. Holding the cage in one hand, push the
seat inward and rotate counterclockwise against the cage. The
seat, spring cage, and spring and disc assembly are individual
components.
4. Clean and reassemble the disc assembly. Or depending on its
condition, discard or replace it with a new assembly from the
repair kit. O-rings should be cleaned or replaced as necessary.
5. Reassemble the check valve modules. Check modules are
installed in the valve body with the seats facing the valve inlet.
The modules must be securely in place before the retainer can
be replaced.
Troubleshooting
SYMPTOM
Check valve fails to hold
1.0 PSID minimum
Chatter during flow conditions
Low flows passing through
mainline valve
Add-on Monitoring Connection Kits
ORDERING CODE ADD-ON/REPLACEMENT KIT
88003067
88003068
CAUSE
Debris on check disc sealing surface
Leaking gate valve
Damaged seat disc or seat O-ring
Damaged guide holding check open
Weak or broken spring
Worn, damaged or defective guide
Mainline check fouled
Meter strainer plugged
Damaged mainline seat disc or seat
Broken mainline spring
BF-BMS-MCK
BMS Monitoring Connection Kit
Series LF007 Model IOT
Sizes 2½" to 3"
RK-BF-Sensors
Pressure Sensor Module
Replacement Kit
Series LF007 Model IOT
Sizes 2½" to 3"
Seat
Seat Disc
O-ring
Assembly
Check Assemblies
Cover
Cover O-ring
Retainer
SOLUTION
Disassemble and clean
Disassemble and clean or repair
Disassemble and replace
Disassemble and clean or replace
Disassemble and replace spring
Disassemble and repair or replace guide
Disassemble and clean
Disassemble and clean
Disassemble and replace
Disassemble and replace
DESCRIPTION
Includes a turnkey solution for transmitting valve
assembly pressure measurements to a building
management system; consists of an interface
module with three (3) sensor cables, data cable,
and power adapter.
Includes three (3) replacement pressure sensor
modules for installation on test cocks No. 2, No. 3,
and No. 4.
Caps/
Spring Retainer
Seat
Body
3