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Standard Components

Operation

The Modulating Float Control Valve is designed to automatically 

maintain a constant liquid level in a tank or reservoir. It is 

controlled by a remote mounted Modulating Float Pilot designed 

to: 1) Modulate Open (allowing fluid out of the main valve cover 

chamber) when reservoir level decreases, and, 2) Modulate 

Closed (allowing fluid to fill the main valve cover chamber) when 

reservoir level increases. A decrease in reservoir level causes the 

valve to modulate towards an open position, allowing reservoir 

level to increase. An increase in reservoir level causes the valve 

to modulate towards a closed position, allowing reservoir level to 

decrease. 
If desired, the float modulating action of the valve can be 
"reversed" by inverting or "reversing" the action of the Modulating 
Float Pilot. The Modulating Float Control is remotely mounted from 
the valve, and field connected with 3/8" minimum copper tubing in 
accordance with factory piping schematic.

1

X

Y/FC

3

P/L

2

X

CLOSES VALVE

OPENS VALVE

FLOW

(AOS)

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 horizon-
tal 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 order-
ing 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.  Install float control onto tank and connect line to valve per schematic. 

7.  Adjust float arm to the high-level setting – the float pilot should be closed.

Start-up of an automatic control valve requires that proper procedures be followed. Time must be allowed for the valve to react to 
adjustments 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.

1 – Main Valve (M100 – Single Chamber)
2 – Modulating Float Control
3 – Adjustable Closing Speed
X – Isolation Cocks

Installation

LFM110-10 (Globe) Modulating Float Control Valve

2          IOM-ACV-110-10_6110-10  2115 

EDP#1917113 

© 2021 Watts

Summary of Contents for LFM110-10

Page 1: ... Control Valve 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 shou...

Page 2: ... 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 horizon tal 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 in...

Page 3: ...lve Tighten the fitting when liquid begins to vent See Figure 1 Step 4 Slowly open downstream isolation valve to establish flow through the system Globe Angle Size in 11 4 11 2 2 21 2 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 11 4 11 2 2 21 2 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...

Page 4: ...too slowly turn the adjustment screw OUT counterclockwise increasing the rate of opening See Figure 2B If the main valve is opening too quickly turn the adjustment screw IN clockwise decreasing the rate of opening See Figure 2A STEP 6 When installing float set angle similar to Figure 3 by adjusting F10 11 modulating float pilot linkage screw shown in Figure 4 4 IOM ACV 110 10_6110 10 2115 EDP 1917...

Page 5: ... 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...

Page 6: ...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 ...

Page 7: ...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 ...

Page 8: ...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 ca...

Page 9: ...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 11...

Page 10: ...ess 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 3...

Page 11: ...IOM ACV 110 10_6110 10 2115 EDP 1917113 2021 Watts 11 NOTES ...

Page 12: ...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 o...

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