Watts LF007 Series Instruction, Installation, Maintenance And Repair Manual

3
Servicing the Check Valves
Seat
Seat
O-ring
Disc
Assembly
Spring Retainer
Caps/
Seat
Cover
Cover O-ring
Retainer
Body
First Check
Second Check
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.
Check Assemblies
Troubleshooting
SYMPTOM CAUSE SOLUTION
Check valve fails to hold
1.0 PSID minimum
Debris on check disc sealing surface Disassemble and clean
Leaking gate valve Disassemble and clean or repair
Damaged seat disc or seat O-ring Disassemble and replace
Damaged guide holding check open Disassemble and clean or replace
Weak or broken spring Disassemble and replace spring
Chatter during flow conditions Worn, damaged or defective guide Disassemble and repair or replace guide
Low flows passing through
mainline valve
Mainline check fouled Disassemble and clean
Meter strainer plugged Disassemble and clean
Damaged mainline seat disc or seat Disassemble and replace
Broken mainline spring Disassemble and replace
Add-on Monitoring Connection Kits
ORDERING CODE ADD-ON/REPLACEMENT KIT DESCRIPTION
88003067 BF-BMS-MCK
BMS Monitoring Connection Kit
Series LF007 Model IOT
Sizes 2½" to 3"
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.
88003068 RK-BF-Sensors
Pressure Sensor Module
Replacement Kit
Series LF007 Model IOT
Sizes 2½" to 3"
Includes three (3) replacement pressure sensor
modules for installation on test cocks No. 2, No. 3,
and No. 4.

Watts LF007 Series Specifications

General

Series	LF007
Category	Control Unit
Maximum working pressure	175 psi
Maximum working temperature	180°F
Hydrostatic test pressure	350 psi
Manufacturer	Watts
Type	Backflow Preventer
Sizes	1/2" - 2"