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STEP 11

Allow pressure to stabilize.

STEP 12

Fine-tune the sustaining setting as required as detailed in STEP 10.

STEP 13

Open upstream isolation valve to return to normal operation.

STEP 14

Actuate the solenoid to close the main valve, checking that the 

main valve closes.

STEP 15

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 desired set point, turn the 

adjustment screw OUT, counterclockwise, increasing the rate of 

closing.

(IF INSTALLED) Opening Speed Flow Control Adjustment: The 

Opening speed flow control allows free flow into the cover and re-

stricted flow out of the cover of the main valve. If recovery of pres-

sure is slow upon increased downstream demand, turn the adjust-

ment screw OUT, counterclockwise, increasing the rate of open-

ing. IF recovery of downstream pressure is too quick, as indicated 

in a rapid increase in pressure, possibly higher than the desired 

set-point, turn the adjustment screw IN, clockwise, decreasing the 

rate of opening (See Figure 3).

Counterclockwise to INCREASE 

the rate of opening

Clockwise to DECREASE 

rate of opening

Figure 3 

Flow Control

4          IOM-A-ACV-920-15_620-15   2115 

EDP# 1917048 

© 2021 Watts

IOM-A-ACV-920-15_620-15   2115 

EDP# 1917048 

© 2021 Watts         5

Summary of Contents for Ames 920GD-15

Page 1: ...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 inf...

Page 2: ...the upstream zone The valve will close if necessary until upstream pressure is above the pilot setting The valve should be specified to include the optional opening speed control and position indicato...

Page 3: ...ed 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 slowly Air is vented through the air b...

Page 4: ...valve until the inlet pressure drops to the desired setting Fine tune the Reducing Control adjustment to the pressure reduc ing setpoint as detailed in Step 7 STEP 10 Adjust the Sustaining Control sc...

Page 5: ...counterclockwise increasing the rate of closing IF INSTALLED Opening Speed Flow Control Adjustment The Opening speed flow control allows free flow into the cover and re stricted flow out of the cover...

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: ...djust 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 Val...

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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