Instructions for Installing Series LF23B,
LF123LP, LFN250 and LFN250B
Water Pressure Reducing Valves
Install Valve in the line with arrow on valve body pointing in the
direction of flow.
This valve should be installed where it is accessible with suf-
ficient clearance for cleaning, service or adjustment. Install
the reducing valve, when possible, before the sill cock line as
shown in diagram. Before installing the reducing valve, flush out
the line to remove loose dirt and scale which might damage
valve disc and seat.
Horizontal installation is recommended. However, valve can be
installed in a vertical position. Regulator must be installed in an
accessible location to facilitate servicing the regulator.
To readjust reduced pressures, loosen adjusting screw nut and
turn adjusting screw clockwise to raise reduced pressure and
counterclockwise to lower reduced pressure.
When reducing valve is used, it makes a closed system;
therefore, pressure relief protection must be provided on the
downstream side of the reducing valve to protect equipment.
CAUTION
!
Anytime a reducing valve is adjusted, the use of a pressure
gauge is recommended to verify correct pressure setting. Do
not bottom out adjusting screw or spring cage.
Servicing
This series is a new development for standard capacity domes-
tic water regulation service. It has special unitized construc-
tion which consists of the seat, disc and stem assembly, and
strainer screen all together in one unit for complete replacement
maintenance.
To clean or replace parts.
1. Remove spring cage and all parts above diaphragm.
2. Loosen and remove diaphragm lock nut, lock washer,
pressure plate, and diaphragm from valve stem.
3. Unscrew seat cylinder from body and remove entire assem-
bly. For diaphragm replacement only, see part number.
4. While disassembled open gate valve to flush out collected
sediment.
NOTICE
Cast iron body regulators (LFN250/LFN250B) are not intended
for buried or pit services.
Main Line Service
Cold Water Supply
Reducing Valve
To Sill Cock
From Street Main
Meter
Adjusting Screw
Adjusting Screw Nut
Spring Cage
SA135B116
Bypass
Assembly for
models “B”
Diaphragm
(Size 1⁄2" - 560CA20)
(Size 3⁄4", 1" - 23B20)
Diaphragm
Lock Nut and
Pressure Plate
Name Plate
Complete Replacement Assembly
See reverse side for ordering information
Stem
Seat Cylinder
Integral
Stainless Steel
Valve Seat
Disc
Strainer
Screen
IS-2323A
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information
can result in death, serious personal injury, property
damage, or damage to the equipment.
Keep this Manual for future reference.
