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4          IOM-A-ACV-985-20_685-20   2115 

EDP# 1917104 

© 2021 Watts

IOM-A-ACV-985-20_685-20   2115 

EDP# 1917104 

© 2021 Watts         5

Closing Speed Flow Adjustment (located on the lower chamber): 
While free flow goes into the upper chamber, the closing speed 
flow control restricts flow out of the lower chamber of the main 
valve.

If valve closing is too slow, turn the adjustment screw OUT, coun-
terclockwise, increasing the rate of closing.

STEP 5

Setting the Relief Control

Figure 2 

Flow Control

Counterclockwise to INCREASE 

the rate of closing

Clockwise to DECREASE 

rate of closing

2A

2B

STEP 6

While pump is operating at normal pressure conditions, slowly 
turn relief pilot adjusting screw counterclockwise (See Figure 3B). 

STEP 7

When main valve begins to open screw pilot adjusting screw 
clockwise until valve closes, then continue to turn clockwise an 
additional ½ turn to set relief control (See Figure 3A).

STEP 8

When pump demand is satisfied, pump will continue to operate 
as the main valve opens. To open main valve, de-energize the 
solenoid, checking that the main valve opens.

STEP 9

Opening Speed Needle Valve Adjustment (located on the upper 
chamber): While free flow goes into the lower chamber, the 
Opening speed flow control restricts flow out of the upper cham-
ber of the main valve. 

If valve opening is too slow, turn the adjustment screw OUT, 
counterclockwise, increasing the rate of opening.

If valve opening is too quick, turn the adjustment screw IN, clock-
wise, decreasing the rate of opening.

STEP 10

At valve full open position deep well pump will stop. Adjust limit 
switch collar to final position to ensure positive actuation of limit 
switch electrical contact, if necessary, by sliding up/down to loca-
tion (See Figure 4).

Figure 4 

Limit Switch in Open Position

Figure 3 

PV20C — Pressure Relief Control

Clockwise to increase inlet 

pressure

3A

3B

Counterclockwise to decrease 

inlet pressure

Summary of Contents for 985GD-20

Page 1: ...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...

Page 2: ...ration The Deep Well Pump Control Valve with Pressure Relief Feature is designed to minimize the surges associated with the starting and stopping of well pumps and open relieving excessive pressure du...

Page 3: ...e times to confirm rate of movement and remove excess air trapped within the cover chambers See Figure 1 Below To increase the rate of opening closing turn the adjustment screws on the speed controls...

Page 4: ...ntrol See Figure 3A STEP 8 When pump demand is satisfied pump will continue to operate as the main valve opens To open main valve de energize the solenoid checking that the main valve opens STEP 9 Ope...

Page 5: ...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 6: ...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...

Page 7: ...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 8: ...posits and inspect for excessive wear Remove any mineral build up from other components with wire brush or by using a Mineral Dissolving Solution Inspect parts for wear and replace if necessary 7 Insp...

Page 9: ...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 Retur...

Page 10: ...3 and Smaller ASTM A276 302 Stainless Steel 13A Bearing Retaining Ring 4 and Larger ASTM A276 302 Stainless Steel 14 Inner Bearing ASTM A276 304 Stainless Steel 15 O ring Buna N Nitrile 16 O ring Buna...

Page 11: ...IOM A ACV 985 20_685 20 2115 EDP 1917104 2021 Watts 11 NOTES...

Page 12: ...021 Watts USA Backflow T 978 689 6066 F 978 975 8350 AmesFireWater com USA Control Valves T 713 943 0688 F 713 944 9445 AmesFireWater com Canada T 888 208 8927 F 905 481 2316 AmesFireWater ca Latin Am...

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