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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.

Missing fixed orifice assembly.

Verify installation of orifice; 
replace if required/missing. 

Pilot valve inlet isolation 
valve can be used as a 
makeshift orifice assembly 
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. 

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/repair 
seat if required.

Troubleshooting Guide

 

6          IOM-A-ACV-910-11_610-11   2115 

EDP# 1917042 

© 2021 Watts

IOM-A-ACV-910-11_610-11   2115 

EDP# 1917042 

© 2021 Watts         7

Summary of Contents for AMES 910GD-11

Page 1: ...etting 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...

Page 2: ...rom 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...

Page 3: ...gure 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...

Page 4: ...rol 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 downs...

Page 5: ...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 Ad...

Page 6: ...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...

Page 7: ...ly 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 o...

Page 8: ...move 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...

Page 9: ...rush 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 thread...

Page 10: ...ts 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 integrit...

Page 11: ...el 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 Iro...

Page 12: ...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 cont...

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