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Standard Components

Operation

The Combination Pressure Reducing and Surge Automatic Control 
Valve (ACV) is designed to automatically reduce a fluctuating higher 
upstream pressure to a constant lower downstream pressure, and 
will quickly modulate toward a closed position if downstream pres-
sure suddenly becomes greater than the desired regulated setpoint. 
The quick closing action prevents possible damaging high inlet 
pressure from passing through the valve to downstream piping. 
Normal regulating action 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.

If downstream pressure suddenly becomes greater than the 
desired regulated setpoint, the normally closed surge control pilot 
opens and rapidly admits higher inlet pressure into the valve cover, 
increasing rate of valve closure. Normal pressure reducing opera-
tion resumes when downstream pressure decreases below the 
desired regulated setpoint.

1

X

X

X

X

Y/FC

P/L

2

3

4

CLOSES VALVE

OPENS VALVE

FLOW

4

CLOSES VALVE

OPENS VALVE

FLOW

AOS

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.  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.  Open the isolation ball valves in the control tubing if so equipped. Failure to open these will prevent the valve from functioning 

properly.

Note: 

If using butterfly valves, ensure valve disc does not contact the main valve.

5.  Provide adequate clearance for valve servicing and maintenance. Refer to valve servicing dimensions on next page.

6.  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.

7.  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.

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

1 – Main Valve (M100 – Single Chamber) 

2 – Pressure Reducing Control 

3 – Downstream Surge Control 

4 – Fixed Orifice

X – Isolation Cocks

Installation

LFM115-7 (Globe) Pressure Reducing Control Valve with 
Downstream Surge Control Feature

2          IOM-ACV-115-7_6115-7   2115 

EDP# 1917041 

© 2021 Watts

Содержание LFM115-7

Страница 1: ... Setting the Pressure Reducing Control 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 co...

Страница 2: ...m from damaging over pressure 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 Open the ...

Страница 3: ...Figure 1 If your valve does not include a bleed valve bleed air by loosen ing a fitting on the valve or a plug at the highest point of the valve assembly Step 3 Pressure the line by opening the upstream isolation valve slowly Air is vented through the air bleed valve or loosened fitting Tighten the fitting when liquid begins to vent See Figure 1 Repeat the process until no air is trapped in the sy...

Страница 4: ...ontrol pressure set point by turning the Pressure Reducing Control adjustment screw IN clockwise STEP 2 Adjust the Surge Control by turning the adjustment screw OUT counterclockwise to decrease the downstream pressure surge set point until the Surge Control starts to reduce the downstream pressure Turn the adjustment screw out to the required set point See Figure 3 STEP 3 Decrease the downstream p...

Страница 5: ...he adjustment screw IN clockwise decreasing the rate of opening See Figure 4 Step 5 If the main valve comes equipped with a closing speed control otherwise ignore this step 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 desire...

Страница 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...

Страница 7: ...mbly by partially opening from full closed position Improperly configured opening speed control if equipped Adjust opening speed control to verify functionality adjust as required Standard setting for opening speed control is 11 2 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 D...

Страница 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...

Страница 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 5 Table 1 details the tool dimensions for seat removal Valve seats 8 and larger are held in the valve body with stainless steel c...

Страница 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...

Страница 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...

Страница 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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