Watts LFM114-2 User manual

Installation, Operation and Maintenance
Rate-of-Flow Control Valve with Pressure Reducing Feature
Sizes: 1¼" to 24"
NOTICE
For Australia and New Zealand: Pipeline strainers should be
installed between the upstream shutoff valve and the inlet of
the backflow preventer.
It’s important that this device be tested periodically in compli-
ance with local codes, but at least once per year or more as
service conditions warrant. If installed on a fire sprinkler system,
all mechanical checks, such as alarm checks and backflow
preventers, should be flow tested and inspected internally in
accordance with NFPA 13 and NFPA 25.
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.
Table of Contents Page
Introduction............................................2
Installation ............................................2
Setting the Rate-of-Flow Controls ..........................3
Maintenance Schedule...................................6
Trouble Shooting Guide ..................................6
Valve Disassembly Instructions ........................ 8
ACV Schematic .......................................11
Local building or plumbing codes may require modifica-
tions to the information provided. You are required to
consult the local building and plumbing codes prior
to installation. If the information provided here is not
consistent with local building or plumbing codes, the
local codes should be followed. This product must be
installed by a licensed contractor in accordance with
local codes and ordinances.
WARNING
!
Need for Periodic Inspection/Maintenance: This product
must be tested periodically in compliance with local codes,
but at least once per year or more as service conditions
warrant. All products must be retested once maintenance
has been performed. Corrosive water conditions and/or
unauthorized adjustments or repair could render the product
ineffective for the service intended. Regular checking and
cleaning of the product’s internal and external components
helps assure maximum life and proper product function.
WARNING
!
Model LFM114-2 / LFM6114-2
IOM-ACV-114-2_6114-2

Standard Components
Operation
The Rate-of-Flow ACV with Pressure Reducing Feature is designed
to automatically limit flow rate to a constant, adjustable, maximum,
and reduce a fluctuating higher upstream pressure to a constant
lower downstream pressure. In most applications, the Pressure
Reducing function will be secondary to the primary Flow Control
Function.
The flow control action of the valve is controlled by a normally open,
differential control pilot designed to: 1) Open (allowing fluid out of the
main valve cover chamber) when the differential pressure across the
orifice plate is below it’s adjustable set point, and, 2) Close (allow-
ing fluid to fill the main valve cover chamber) when the differential
pressure across the orifice plate is above it’s adjustable set point.
A decrease in differential pressure causes the valve to modulate
towards an open position, increasing flow rate. An increase in differ-
ential pressure causes the valve to modulate towards a closed posi-
tion, decreasing flow rate.
1
X
XX
Y/FC
P/L
4
5
3
2
CLOSES VALVE
OPENS VALVE
FLOW
(AOS)
The pressure reducing action of the valve is controlled by a normally open, pressure reducing pilot designed to: 1) Open (allowing fluid out
of the main valve cover chamber) when downstream pressure is below the adjustable setpoint, and 2) Close (allowing fluid to fill the main
valve cover chamber) when downstream pressure is above the adjustable setpoint. A decrease in downstream pressure causes the valve to
modulate toward an open position, raising downstream pressure. An increase in downstream pressure causes the valve to modulate toward a
closed position, lowering downstream pressure.
The Orifice Plate Assembly should be installed three to five pipe diameters downstream of the Rate-of- Flow Valve, and field connected with
3/8" minimum copper tubing in accordance with factory piping schematic.
Please specify desired flow rate PRIOR to ordering.
1 - Main Valve (M100 – Single Chamber)
2 - Rate-of-Flow Control
3 - Pressure Reducing Control Remote Sense
4 - Adjustable Closing Speed
5 - Orifice Plate Assembly
X - Isolation Cocks
1. Prior to installation, flush line to remove debris.
2. Install valve so the flow arrow matches flow through the line, and gauges to monitor valve inlet and outlet pressures. A Position Indicator
can be installed to provide visual indication of valve position and operation without disassembly.
3. Install isolation valves upstream and downstream of the main valve.
4. Provide adequate clearance for valve servicing and maintenance. Refer to valve servicing dimensions on next page. Avoid installing
valves 6" and larger in the vertical position (main valve stem horizontal). Automatic Control Valves (ACVs) are designed for horizontal in-
line installation, with the cover facing up (main valve stem vertical). Slow operation or premature stem and guide wear may occur if valve
is not installed according to factory recommendations. Consult factory for detailed engineering review prior to ordering if valve is to be
installed other than horizontally in-line.
5. If valve is equipped with a pilot control system, extra precautions should be made during installation to protect the piping circuit from
damage. Only remove the pilot control system from the valve if necessary. Tubing and fittings should be kept clean and replaced exactly
as removed. Consult appropriate hydraulic schematic to ensure proper re-assembly.
6. To accurately set flow rates, either a differential gauge or a flow meter should be installed.
7. Check orifice plate to assure that sense holes are free from obstruction.
8. After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.
9. Install a pressure gauge at a location downstream of valve.
Start-up of an automatic control valve requires that proper procedures be followed. Time must be allowed for the valve to react to adjust-
ments and the system to stabilize. The objective is to bring the valve into service in a controlled manner to protect the system from damaging
over-pressure.
Installation
LFM114-2 (Globe) Rate-of-Flow Control Valve with Pressure
Reducing Feature
2 IOM-ACV-114-2_6114-2 2115 EDP# 1917073 © 2021 Watts

Setting the Rate of Flow Control Valves
STEP 1
Pre-set pilots as noted:
Rate of Flow – Adjust OUT, counterclockwise, to start valve at a lower flow rate.
Pressure Reducing – Adjust OUT, counterclockwise, backing pressure off the spring, preventing possible over-pressuring of the system.
Opening and Closing Speed – Turn the adjustment screws on the Closing Speed and Opening Speed Controls, if the main valve is so
equipped, OUT, counterclockwise, 1½ to 2½ turns from full closed position.
STEP 2
To ensure proper operation, any trapped air will need to be bled
off the valve cover during startup. The ACV includes a bleed valve,
use a flat head screwdriver to slowly open the valve (See Figure 1).
STEP 3
Pressure the line, by opening the upstream isolation valve slowly.
Air is vented through the air bleed valve. Tighten the fitting when
liquid begins to vent (See Figure 1).
Repeat the process until no air is trapped in the system.
STEP 4
Slowly open downstream isolation valve to establish flow through
the system.
STEP 5
With a demand for flow on the system, the valve can now be
adjusted for the proper flow rate. This requires a meter to read the
flow that the valve is providing.
Globe
Angle
Size (in) 1¼ 1½ 2 2½ 3 4 6 8 10 12 14 16 20 24
A (in) 16 16 20 22 22 24 32 34 38 44 48 52 56 56
B (in) 10 10 12 14 14 16 24 26 28 30 34 40 48 48
Size (in) 1¼ 1½22½ 3 4 6 8 10 12 14 16
C (in) 16 16 20 22 22 24 32 34 38 44 48 52
D (in) 10 10 12 14 14 16 24 26 28 30 34 40
Counterclockwise to OPEN
bleed valve
The following tables detail the recommended minimum valve servicing dimensions.
A
B
C
FLOW FLOW
FLOW
D
FLOW
Valve Servicing Dimensions
Figure 1
Position Indicator
IOM-ACV-114-2_6114-2 2115 EDP# 1917073 © 2021 Watts 3

STEP 6
While reading the meter register, adjust the Rate of Flow Control:
Turn the adjustment screw IN, clockwise, to increase the flow rate
regulated (See Figure 2A).
Turn the adjustment screw OUT, counterclockwise, to reduce or
lower the flow rate regulated (See Figure 2B).
Setting the Rate-of-Flow Pilot Counterclockwise to REDUCE
Flow Rate Limit
Counterclockwise to DECREASE
Downstream Pressure
Clockwise to INCREASE
Flow Rate Limit
Clockwise to INCREASE
Downstream Pressure
2A 2B
Setting the Pressure Reducing
Pilot
STEP 7
Fine tune the Pressure Reducing Control to the desired pres-
sure set point by turning the adjustment screw IN, clockwise to
increase (See Figure 3A) or OUT, counterclockwise to decrease
(See Figure 3B) downstream pressure.
STEP 8
Closing Speed Needle Valve Adjustment: The closing speed
needle valve regulates fluid pressure into the main valve cover
chamber, controlling the valve closing speed.
If the downstream pressure fluctuates slightly above the desired
set point, turn the adjustment screw OUT, counterclockwise,
increasing the rate of closing.
STEP 9
Opening Speed Flow Control Adjustment: The Opening speed
flow control allows free flow into the cover and restricted flow out
of the cover of the main valve.
If valve opening is too slow, turn the adjustment screw OUT,
counterclockwise, increasing the rate of opening (See Figure 4B).
If valve opening is too quick, turn the adjustment screw IN, clock-
wise, decreasing the rate of opening (See Figure 4A).
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
4A 4B
Figure 4
Flow Control
3A 3B
Figure 2
CP14-1 Rate-of-Flow Control Pilot
Figure 3
Pressure Reducing Control Pilot
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To ensure peak performance and longevity of your automatic
control valve, Watts/Ames recommends following the below
standard maintenance schedule.
• Monthly Maintenance
– Visual inspection of valve(s) for leaks
– Inspect for proper operation(s); exercise valve.
• Quarterly Maintenance
– Conduct monthly inspection.
– Validate/Re-establish necessary setpoints of controls/pilots.
• Annual Maintenance
– Conduct monthly & quarterly inspections.
– Inspect & clean all strainers.
– Inspect valve coating, touch up as required.
• 3-5 Year Maintenance
– Conduct monthly, quarterly, & annual maintenance.
– Inspect & replace valve elastomers (diaphragm, O-rings,
valve/pilot seats)
– Re-establish necessary set points of controls/pilots.
Automatic Control Valve Maintenance Schedule
Troubleshooting Guide
Warning: The valve cannot be serviced under pressure.
Upstream and downstream Isolation Valves must be installed
to protect system piping. Accurate diagnosis and trouble-
shooting requires the valve to open fully, and may subject
downstream piping and equipment to high pressure and/or
flow rates. The downstream Isolation Valve should be kept
closed while diagnosing the valve.
Extreme caution should be used while performing the
troubleshooting techniques listed below.
WARNING
!
Recommended tools for diagnosis: (3) PRESSURE GAUGES,
installed to monitor the inlet pressure, outlet pressure, and cover
chamber pressure. If included, a POSITION INDICATOR should
be installed to visually assess the position of the disc &
diaphragm assembly.
Test 1: Diaphragm Seal Test
1. Close upstream & downstream isolation valves. Close pilot
isolation valves or remove pilot control tubing to isolate valve
cover from incoming fluid & pressure. Remove uppermost
cover plug, test cock, or limit switch.
2. With the valve cover chamber vented to atmosphere,
partially open the upstream isolation valve, allowing incoming
pressure to lift the disc & diaphragm assembly. A volume of
water will be displaced from the cover chamber as the valve
opens; consult valve specification sheets for approximate
cover capacity. A continuous flow of water from the open port
indicates a damaged diaphragm or loose disc & diaphragm
assembly. Disassemble valve and replace diaphragm or tighten
disc & diaphragm assembly.
Test 2: Seat Seal Test
1. Close downstream isolation valve and install pressure gauges
on an open inlet and outlet port of main valve.
2. Open upstream isolation valve to allow pressure on to the
valve cover. Allow valve to fully close.
3. Monitor downstream pressure gauge; reading should hold
steady below incoming pressure. If pressure on downstream
side rises to match upstream pressure, leakage is occurring
through the seat of the main valve. Disassemble valve, inspect
and repair/replace any required parts.
a. If gauge pressure rises to match outlet pressure (down-
stream of closed isolation valve) yet remains below inlet
pressure, the isolation valve may be leaking as opposed to
main valve seat.
Test 3: Freedom of Movement/Valve
Travel Test
1. Close upstream and downstream isolation valves. Install valve
position indicator.
2. Partially open upstream isolation valve and allow cover to fill
with fluid & pressure, closing the valve fully. Mark the position
indicator’s full closed position.
3. Isolate cover chamber from receiving fluid and pressure by
closing isolation valves or removing control tubing.
4. Carefully vent cover chamber to atmosphere by opening test
cock or removing a cover plug. Observe the valve position
indicator as the valve travels to the full-open position. The disc
& diaphragm assembly should move freely from fully closed to
fully open position without binding or “grabbing” at any point
during its movement.
a. The disc & diaphragm assembly may momentarily “hesi-
tate” while travelling from fully closed to fully open position
– this is a normal characteristic of diaphragm operated
control valves, and does not indicate mechanical binding
or improper valve operation.
b. A continuous discharge of water from the cover chamber
after venting to atmosphere indicates leakage past the
diaphragm.
5. If necessary, disassemble valve and inspect/repair disc &
diaphragm assembly.
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Issue Possible Cause Corrective Action Notes
Main Valve will not
open
Closed isolation valves in pilot system. Check isolation valves, ensure
open.
Insufficient supply pressure. Check upstream pressure. Depending on water
source, supply pressure
may not be controlled by
valve operator.
Main valve stem assembly corroded/
damaged
Inspect stem assembly, clean/
replace if necessary.
Blockage in pilot system. Inspect & clean any installed
pilot system strainers, check
orifice/speed controls for
blockages.
Improperly configured opening speed
control.
Adjust opening speed control
to verify functionality, adjust as
required.
Standard setting for open-
ing speed control is 1 1/2
- 2 1/2 turns open from full
closed position. Can be
adjusted in field.
Main Valve will not
close
Closed isolation valves in pilot system Check isolation valves, ensure
open.
Diaphragm is damaged Conduct diaphragm seal test,
repair and replace if necessary.
Main valve stem assembly corroded/
damaged.
Inspect stem assembly, clean/
replace if necessary.
Blockage in main valve. Perform freedom of movement
test; if valve does not close,
disassemble and remove
blockage.
Worn/damaged valve seat. Perform seat sealing check;
disassemble and inspect/re-
pair seat if required.
Improperly configured closing speed
control.
Adjust closing speed control
to verify functionality, adjust as
required.
Standard setting for
closing speed control is
11/2 - 21/2 turns open from
full closed position. Can
be adjusted in field.
Field installed orifice lines are reversed Reinstall per schematic
Troubleshooting Guide
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Valve Disassembly Instructions
Before undertaking valve disassembly, it is recommended to gather the following tools to aid you during the process:
• Small & large adjustable wrenches
• Screwdriver set
• Machinist fine metal file
• Fine wire brush
• Bench vise
• Basic valve IO&M manual
• Hammer & dull cold chisel
• Heavy-duty ratchet & socket set
• Hexagonal wrench set
• 320 grit/fine Emery cloth
• Appropriate technical bulletins for
valve start-up procedures.
1. Isolate the valve from line pressure and depressurize it to ensure safe working conditions. Disconnect any electrical
connections if so equipped.
2. Carefully remove Position Indicator or Limit Switches if equipped. Remove all tubing, fittings, and Control Pilots
necessary to easily access and remove the cover. Remove cover nuts and washers.
3. Remove the cover. If cover is not free to be removed, loosen it by tapping upward along its outside edge with a dull cold chisel, pic-
tured above.
a. Large valves may require the installation of lifting “eye” bolts in order to facilitate cover removal; installation ports are provided on
the cover for this purpose.
4. Remove the Disc and Diaphragm Assembly from the valve body by lifting straight up.
a. Large diameter valves may require a lifting “eye” bolt to be installed in the valve stem accessory threads located on the very
top of the valve stem.
5. Before removing Stem Nut, examine stem threads for mineral build-up. Remove deposits with a fine wire brush. Extreme care should
be taken not to damage the finish on stem guiding surfaces when disassembling. Avoid applying pipe wrenches to top or bottom
stem guide surfaces.
VALVE COVER
BRASS BAR STOCK
(ANGLE UPWARD)
HAMMER
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Size A B C D E (Dia.) F
in Pipe Size (in) Min. Length (in) in in in in
1¼ 1 3.12 0.38 0.25 0.44 0.55
1½ 1 3.12 0.38 0.25 0.44 0.50
2 1¼3.38 0.38 0.25 0.44 0.50
2½ 2 4.0 0.38 0.38 0.56 0.62
3 2½4.5 0.50 0.38 0.56 0.62
4 3 5.0 0.50 0.44 0.56 0.62
6 5 6.50 0.62 0.44 0.56 0.62
6. After removing the Stem Nut, the remainder of the Disc & Diaphragm Assembly should disassemble easily. Polish stem guide
surfaces with fine emery cloth to remove any mineral deposits and inspect for excessive wear. Remove any mineral build-up from
other components with wire brush or by using a Mineral Dissolving Solution. Inspect parts for wear and replace if necessary.
7. Inspect valve seat. If seat is not damaged, removal is not necessary. Valve seats 6" and smaller are threaded into the body of the
valve and require a seat removal tool (Figure 5) (Table 1 details the tool dimensions for seat removal). Valve seats 8" and larger are
held in the valve body with stainless steel cap screws. Remove seat retaining screws and lift seat straight up (Figure 6).
Figure 6
*Schedule 40 steel pipe
Figure 5
Valve Body
Valve Seat
All-Thread
Nut and Washer
2PLCS
Angle or
Channel Iron
120
B (Min)
E Dia. 4 Holes
90 Apart
D
TYP <3 PLCS>
120 Apart
C TYP <3 PLCS>
F
A
Table 1: Seat Removal Tool Dimension
8 IOM-ACV-114-2_6114-2 2115 EDP# 1917073 © 2021 Watts

Size (in) 3 4 6 8 10 12 16 20 & 24
P/N 0677-01 0677-01 0677-02 0677-03 0677-04 0677-05 0677-09 0677-11
8. Replace Seat Disc, Diaphragm and Spacer Washers provided in Main Valve repair kit (refer to Table 2 or 3 for correct repair kit part
number). Re-assemble in the reverse order of disassembly.
9. Re-Install Disc and Diaphragm Assembly in the valve, taking care not to damage the lower guide area in the center of the valve
seat.
10. Re-install Cover Spring. Replace Valve Cover and tighten Cover Nuts in a crossing pattern to ensure even distribution. Test the Disc
and Diaphragm Assembly for smooth travel by following the Freedom of Movement Test procedure in previous section.
11. Test the integrity of the Seat Seal by following the Seat Seal Test procedure in previous section.
12. Return valve to service by following instructions on the Technical Bulletin matching the valve function.
Size (in) 1¼ 1½22½ 3 4 6 8 10 12 14 16
P/N 0677-01 0677-01 0677-02 0677-03 0677-04 0677-05 0677-06 0677-07 0677-08 0677-09 0677-10 0677-11
IOM-ACV-114-2_6114-2 2115 EDP# 1917073 © 2021 Watts 9
Table 2: Full Port Valve (M100/M1100) Repair Kits
Table 3: Reduced Port Valve (M6100 / M61100) Repair Kits

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Optional
Xylan
Coating
17A
6
1
2
3
4
5
7
8
9
11
12
13
14
15
16
17
18
10
Item Description Material
1Pipe Plug Lead Free Brass
2Cover ASTM A536 65-45-12 Epoxy Coated Ductile Iron
3Cover Bearing ASTM A276 304 Stainless Steel
4Stud with Cover Nut and Washer ASTM A570 Gr.33 Zinc Plated Steel
5Body ASTM A536 65-45-12 Epoxy Coated Ductile Iron
6Spring ASTM A276 302 Stainless Steel
7Stem Nut ASTM A276 304 Stainless Steel
8Lock Washer ASTM A276 304 Stainless Steel
9Stem Washer ASTM A276 304 Stainless Steel
10 Diaphragm Washer ASTM A536 65-45-12 Epoxy Coated Ductile Iron
11 Diaphragm* Buna-N (Nitrile)
12 Disc Retainer ASTM A536 65-45-12 Epoxy Coated Ductile Iron
13 Seat Disc* Buna-N (Nitrile)
14 Spacer Washer* x5 NY300 Fiber*
15 Disc Guide ASTM A743 CF8M (316) Stainless Steel
16 Shaft ASTM A276 304 Stainless Steel
17 Seat Ring** ASTM A743 CF8M (316) Stainless Steel
17A Seat Screw** (8" and Larger) ASTM A276 304 Stainless Steel
18 Seat Gasket* Buna-N (Nitrile)
* Contained in Main Valve Repair Kit
**Note: 6 inch and Smaller Valves, Seat Ring is threaded
Installation: If unit is installed in any orientation other than
horizontal (cover up) OR extreme space constraints exist,
consult customer service prior to or at the time of order.
NOTICE
ACV Assembly Diagram – Series LFM114-2

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NOTES

IOM-ACV-114-2_6114-2 2115 EDP# 1917073 © 2021 Watts
USA: T: [phone] • F: [phone] • Watts.com
Canada: T: [phone] • F: [phone] • Watts.ca
Latin America: T: (52) 55-4122-0138 • Watts.com
Limited Warranty: Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of
original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER
WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special
or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting
from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no
control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above
limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to
determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.