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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 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/repair 
seat if required.

Solenoid will not 
actuate

Possible Cause: Low or no voltage

Check voltage at the solenoid 
connection, insuring that it has 
the minimum of 85% of the 
coils rated voltage.

Should be performed by 
licensed electrician

Troubleshooting Guide

 

6          IOM-A-ACV-920-01-15_620-01-15   2115 

EDP# 1917050 

© 2021 Watts

IOM-A-ACV-920-01-15_620-01-15   2115 

EDP# 1917050 

© 2021 Watts         7

Summary of Contents for AMES 920GD-01-15

Page 1: ...n 2 Setting the Pressure 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...

Page 2: ...sure in the upstream zone falls below the pilot setting the valve modulates toward a closed position sustaining pressure in the upstream zone The valve will close if necessary until upstream pressure...

Page 3: ...does not include a bleed valve bleed air by loosening a fitting on the valve or a plug at the highest point of the valve as sembly STEP 5 Pressure the line by opening the upstream isolation valve slow...

Page 4: ...the desired setting STEP 4 Adjust the Sustaining Control screw IN clockwise until the inlet pressure begins to increase or OUT counterclockwise to de crease stopping at the desired pressure See Figure...

Page 5: ...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...

Page 6: ...cification 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...

Page 7: ...st 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...

Page 8: ...e 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...

Page 9: ...h 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...

Page 10: ...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 o...

Page 11: ...Steel 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...

Page 12: ...sulting 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...

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