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Standard Components

Operation

The Two-Way Flow Altitude Automatic Control Valve (ACV) with 
Delayed Open for Return Flow Feature is designed to control the 
maximum water level in elevated water storage tanks and to allow 
flow from the tank back into the water system after the system 
water pressure has fallen below the elevated storage tank shut-off 
head pressure by an adjustable amount of pressure. The high level 

P(L)

1

X

X

X

X

Y/FC

7

4

8

2

CLOSES VALVE

OPENS VALVE

FLOW

3

(Tank Sense Line)

5

6

control is accomplished using a spring loaded 3-way altitude control and a large ported 3-way accelerator control. The altitude pilot 
responds to the rising water level in the storage tank through a field installed sense line. The altitude pilot will signal the accelerator to 
open the main valve by venting the main cover chamber or close the main valve by pressurizing the main cover chamber. When the 
system pressure falls below the tank head pressure the Delayed Open for Return Flow feature is achieved by a normally open pressure 
control that holds the return flow line closed until the system pressure falls to the set point of the normally open pressure control.

Specify Tank height PRIOR to ordering.

1 – Main Valve (M100 - Single Chamber)
2 – Model 22-1 Accelerator Control
3 – Altitude Control
4 – Delayed Opening Control
5 – Adjustable Opening Speed
6 – Adjustable Closing Speed 
7 – 3-Way Ball Valve
8 – Check Valve
P – Position Indicator
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.

 

Note:

 If using butterfly valves, ensure valve disc does not contact 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.  Check to confirm that the sense line is installed and connected.

7.  Installation of a pressure gauge on the sense line of the tank full-delayed opening system will assist in adjustment of setpoint. The 

amount of pressure drop can be read at the time the main valve starts opening.

8.  After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.

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.

Installation

LFM127-3 (Globe) Two-Way Flow Altitude Control Valve with 
Delay Open for Return Flow

2          IOM-ACV-127-3_6127-3 2115 

EDP# 1917067 

© 2021 Watts

Summary of Contents for LFM127-3

Page 1: ...2 Setting the Altitude 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...

Page 2: ... 3 Install isolation valves upstream and downstream of the main valve Note If using butterfly valves ensure valve disc does not contact 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...

Page 3: ...pped 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 Globe A...

Page 4: ...level slightly below the tank over flow mark eliminat ing any wave action discharge from the over flow pipe Setting the Altitude Pilot STEP 4 Slowly open the downstream isolation valve STEP 5 If the valve remains closed as indicated by the stem position in the position indicator See Figure 2 and the tank level is known to be below the desired level SLOWLY turn the adjustment screw IN clockwise by ...

Page 5: ...urning the adjustment screw IN clockwise to increase or OUT counter clockwise to decrease opening delay See Figure 5B 5A 5B IOM ACV 127 3_6127 3 2115 EDP 1917067 2021 Watts 5 Counterclockwise to DECREASE opening delay Clockwise to INCREASE opening delay Figure 5 CP15 Delayed Opening Control ...

Page 6: ...e 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 valv...

Page 7: ...21 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 v...

Page 8: ... 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 9: ... 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 6 Table 1 details the tool dimensions for seat removal Valve seats 8 and larger are held in the valve body with stainless steel c...

Page 10: ... 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 1...

Page 11: ...l 9 Stem 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...

Page 12: ...ot 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 ov...

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