Watts 985GD-20 Installation and operating instructions

Installation, Operation and Maintenance
Deep Well Control Valve with Pressure Relief Feature
Sizes: 2" to 24"
NOTICE
For Australia and New Zealand: Pipeline strainers should be
installed between the upstream shutoff valve and the inlet of
the backflow preventer.
It’s important that this device be tested periodically in compli-
ance with local codes, but at least once per year or more as
service conditions warrant. If installed on a fire sprinkler system,
all mechanical checks, such as alarm checks and backflow
preventers, should be flow tested and inspected internally in
accordance with NFPA 13 and NFPA 25.
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information
can result in death, serious personal injury, property
damage, or damage to the equipment.
Keep this Manual for future reference.
Table of Contents Page
Introduction............................................2
Installation ............................................2
Commissioning the Deep Well Pump 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 codes, the
local codes should be followed. This product must be
installed by a licensed contractor in accordance with
local codes and ordinances.
WARNING
!
Need for Periodic Inspection/Maintenance: This product
must be tested periodically in compliance with local codes,
but at least once per year or more as service conditions
warrant. All products must be retested once maintenance
has been performed. Corrosive water conditions and/or
unauthorized adjustments or repair could render the product
ineffective for the service intended. Regular checking and
cleaning of the product’s internal and external components
helps assure maximum life and proper product function.
WARNING
!
CLOSES VALVE
OPENS VALVE
FLOW
(Supply Pressure)
Model 985GD-20 / 685GD-20
IOM-A-ACV-985-20_685-20

985GD-20 (Globe) Deep Well Control Valve with Pressure Relief Feature
2 IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts
Standard Components
1
4
XX
X
X
X
6
2(L)
5
CLOSES VALVE
OPENS VALVE
FLOW
X/Y
(Supply Pressure)
3
Installation
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. Install isolation
valves upstream and downstream of the main valve.
3. Provide adequate clearance for valve servicing and maintenance. Refer to valve servicing dimensions on next page. Avoid installing
valves 6" and larger in the vertical position (main valve stem horizontal). Automatic Control Valves (ACVs) are designed for horizon-
tal 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 order-
ing if valve is to be installed other than horizontally in-line.
4. 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.
5. Connect solenoid wiring leads to desired switching device, using safe, standard electrical practices.
6. Wire the limit switch contacts to the proper relay connections, using safe, standard electrical practices. Adjust the limit switch collar
to the approximate make/break contact position.
7. Field install remote operating pressure line, minimum recommended size ½”, to the downstream side of the system check valve.
8. After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.
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.
Operation
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,
during the pumping cycle. The valve slowly opens and closes as
required to control pumping related surges. The pump starts and
stops against an open valve.
Pump start up: When the pump is signaled to start, the 4-Way
Solenoid is energized and directs fluid and pressure into the cover
chamber (above the diaphragm), and relieves fluid and pressure
from the power chamber (below the diaphragm). The fluid and
pressure relieved from the cover chamber is vented to atmo-
sphere or available floor drain. The valve closes at an adjustable
rate, gradually admitting pumping pressure into the distribution
system. Rate of valve closure is controlled by the adjustable clos-
ing speed control, which restricts the speed at which fluid and
pressure evacuate the power chamber. The valve remains closed
during the pumping cycle.
Pressure Relief Feature: During the pumping cycle, the valve acts
as a pressure relief valve. The valve, which is closed during the
pumping cycle, senses header pressure and quickly opens when
header pressure exceeds the pilot setting, relieving excess pres-
sure. When header pressure is lowered below the pilot setting, the
valve closes.
Pump shutdown: When the pump is signaled to shut-off, the
4-Way Solenoid is de-energized, and directs fluid and pressure
into the power chamber (below the diaphragm), and relieves fluid
and pressure from the cover chamber (above the diaphragm). The
fluid and pressure relieved from the cover chamber is vented to
atmosphere or available floor drain. The valve opens at an adjust-
able rate, gradually reducing pumping pressure, allowing the
system check valve to slowly close. Rate of valve opening is con-
trolled by the adjustable opening speed control, which restricts
the speed at which fluid and pressure evacuate the cover cham-
ber. When the valve reaches the full open position, the limit switch
is actuated, turning the pump off.
Manual Operation: Engaging the Solenoid Manual operator
simulates power to the solenoid, manually closing the main valve.
Disengaging the Solenoid Manual operator returns the valve to the
open position.
1 – Main Valve (900GD-16 – Dual Chamber)
2 – Limit Switch
3 – 4-Way Solenoid
4 – Adjustable Opening Speed
5 – Adjustable Closing Speed
6 – Pressure Relief Control
Y – Y-Strainer
X – Isolation Cocks

The following tables detail the recommended minimum valve servicing dimensions.
A
B
C
FLOW
FLOW
FLOW
D
FLOW
Valve Servicing Dimensions
Figure 1
4-Way Solenoid
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Commissioning Deep Well Pump Control
STEP 1
NOTE: System needs to be filled, pressurized, and ready for flow.
Pre-set pilots as noted:
Opening and Closing Speed – Prior to pump start, actuate manual operator on solenoid to enable diaphragm assembly to stroke
open and closed. Observing the limit switch stem indicator, monitor rate of opening and closing speed. Adjust accordingly per applica-
tion requirements.
Pressure Relief Pilot – Screw pilot adjusting screw clockwise completely.
Note: Cycle diaphragm multiple 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 OUT, counterclockwise (See Figure
2B on following page). In decrease the rate of opening/closing,
turn the adjustment screws on the speed controls IN, clockwise
(See Figure 2A on following page).
STEP 2
Prior to pump start, energize the solenoid to confirm connection
to power source.
STEP 3
De-energize the solenoid prior to initial pump start.
STEP 4
Energize the solenoid at pump start to close the main valve,
checking that the main valve closes.
Globe
Angle
Size (in) 2 2½ 3 4 6 8 10 12 14 16 20 24
A (in) 20 22 22 24 32 34 38 44 48 52 56 56
B (in) 20 22 22 25 36 38 40 44 48 50 50 50
Size (in) 2 2½ 3 4 6 8 10 12 14 16
C (in) 20 22 22 24 32 34 38 44 48 52
D (in) 20 22 22 25 36 38 40 44 48 50
Manual
Operation
Normal
Operation

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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

To ensure peak performance and longevity of your automatic
control valve, Watts/Ames recommends following the below
standard maintenance schedule.
• Monthly Maintenance
– Visual inspection of valve(s) for leaks
– Inspect for proper operation(s); exercise valve.
• Quarterly Maintenance
– Conduct monthly inspection.
– Validate/Re-establish necessary setpoints of controls/pilots.
• Annual Maintenance
– Conduct monthly & quarterly inspections.
– Inspect & clean all strainers.
– Inspect valve coating, touch up as required.
• 3-5 Year Maintenance
– Conduct monthly, quarterly, & annual maintenance.
– Inspect & replace valve elastomers (diaphragm, O-rings,
valve/pilot seats)
– Re-establish necessary set points of controls/pilots.
Automatic Control Valve Maintenance Schedule
Troubleshooting Guide
Warning: The valve cannot be serviced under pressure.
Upstream and downstream Isolation Valves must be installed
to protect system piping. Accurate diagnosis and trouble-
shooting requires the valve to open fully, and may subject
downstream piping and equipment to high pressure and/or
flow rates. The downstream Isolation Valve should be kept
closed while diagnosing the valve.
Extreme caution should be used while performing the
troubleshooting techniques listed below.
WARNING
!
Recommended tools for diagnosis: (3) PRESSURE GAUGES,
installed to monitor the inlet pressure, outlet pressure, and cover
chamber pressure. If included, a POSITION INDICATOR should
be installed to visually assess the position of the disc &
diaphragm assembly.
Test 1: Diaphragm Seal Test
1. Close upstream & downstream isolation valves. Close pilot
isolation valves or remove pilot control tubing to isolate valve
cover from incoming fluid & pressure. Remove uppermost
cover plug, test cock, or limit switch.
2. With the valve cover chamber vented to atmosphere,
partially open the upstream isolation valve, allowing incoming
pressure to lift the disc & diaphragm assembly. A volume of
water will be displaced from the cover chamber as the valve
opens; consult valve 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 valve to allow pressure on to the
valve cover. Allow valve to fully close.
3. Monitor downstream pressure gauge; reading should hold
steady below incoming pressure. If pressure on downstream
side rises to match upstream pressure, leakage is occurring
through the seat of the main valve. Disassemble valve, inspect
and repair/replace any required parts.
a. If gauge pressure rises to match outlet pressure (down-
stream of closed isolation valve) yet remains below inlet
pressure, the isolation valve may be leaking as opposed to
main valve seat.
Test 3: Freedom of Movement/Valve
Travel Test
1. Close upstream and downstream isolation valves. Install valve
position indicator.
2. Partially open upstream isolation valve and allow cover to fill
with fluid & pressure, closing the valve fully. Mark the position
indicator’s full closed position.
3. Isolate cover chamber from receiving fluid and pressure by
closing isolation valves or removing control tubing.
4. Carefully vent cover chamber to atmosphere by opening test
cock or removing a cover plug. Observe the valve position
indicator as the valve travels to the full-open position. The disc
& diaphragm assembly should move freely from fully closed to
fully open position without binding or “grabbing” at any point
during its movement.
a. The disc & diaphragm assembly may momentarily “hesi-
tate” while travelling from fully closed to fully open position
– this is a normal characteristic of diaphragm operated
control valves, and does not indicate mechanical binding
or improper valve operation.
b. A continuous discharge of water from the cover chamber
after venting to atmosphere indicates leakage past the
diaphragm.
5. If necessary, disassemble valve and inspect/repair disc &
diaphragm assembly.
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Troubleshooting Guide
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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.
Improperly configured opening speed
control.
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/re-
pair seat if required.
Improperly configured closing speed
control.
Adjust closing speed control
to verify functionality, adjust as
required.
Standard setting for
closing speed control is
11/2 - 21/2 turns open from
full closed position. Can
be adjusted in field.
Pressure Relief Control valve fails to
open.
Adjust, repair, or replace pres-
sure relief control valve.
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.
Manual operated is engaged. Turn manual operator counter-
clockwise to disengage.

Valve Disassembly Instructions
Before undertaking valve disassembly, it is recommended to gather the following tools to aid you during the process:
• Small & large adjustable wrenches
• Screwdriver set
• Machinist fine metal file
• Fine wire brush
• Bench vise
• Basic valve IO&M manual
• Hammer & dull cold chisel
• Heavy-duty ratchet & socket set
• Hexagonal wrench set
• 320 grit/fine Emery cloth
• Appropriate technical bulletins for
valve start-up procedures.
1. Isolate the valve from line pressure and depressurize it to ensure safe working conditions. Disconnect any electrical
connections if so equipped.
2. Carefully remove Position Indicator or Limit Switches if equipped. Remove all tubing, fittings, and Control Pilots
necessary to easily access and remove the cover. 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 by lifting straight up.
a. Large diameter valves may require a lifting “eye” bolt to be installed in the valve stem accessory threads located on the very
top of the valve stem.
5. Before removing Stem Nut, examine stem threads for mineral build-up. Remove deposits with a fine wire brush. Extreme care should
be taken not to damage the finish on stem guiding surfaces when disassembling. Avoid applying pipe wrenches to top or bottom
stem guide surfaces.
VALVE COVER
BRASS BAR STOCK
(ANGLE UPWARD)
HAMMER
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6. After removing the Stem Nut, the remainder of the Disc & Diaphragm Assembly should disassemble easily. Polish stem guide
surfaces with fine emery cloth to remove any mineral deposits 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. Inspect valve seat. If seat is not damaged, removal is not necessary. If it is damaged please contact factory for instructions.
8 IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts 9

8. Replace Seat Disc, Diaphragm and Spacer Washers provided in Main Valve repair kit (refer to Table 2 or 3 for correct repair kit part
number). Re-assemble in the reverse order of disassembly.
9. Re-Install Disc and Diaphragm Assembly in the valve, taking care not to damage the lower guide area in the center of the valve
seat.
10. Re-install Cover Spring. Replace Valve Cover and tighten Cover 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) 2 2½ 3 4 6 8 10 12 14 16
P/N 0677-21 0677-22 0677-23 0677-24 0677-25 0677-26 Consult Factory 0677-28 0677-29 0677-30
Table 3: Reduced Port Valve (605GD/605AD) Repair Kits
Table 2: Full Port Valve (905GD/905AD) Repair Kits
8 IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts 9
Size (in) 3 4 6 8 10 12 16 20 & 24
P/N 0677-21 0677-23 0677-24 0677-25 0677-26 0677-27 0677-28 0677-30

10 IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts 11
Installation: If unit is installed in any orientation other than
horizontal (cover up) OR extreme space constraints exist,
consult customer service prior to or at the time of order.
NOTICE
ITEM DESCRIPTION MATERIAL
1Pipe Plug Lead Free Brass
2Cover ASTM A536 65-45-12 Epoxy Coated Ductile Iron
3Cover Bearing ASTM A276 304 Stainless Steel
4Stud with Cover Nut & Washer ASTM A570 Gr.33 Zinc Plated Steel
5Upper Body ASTM A536 65-45-12 Epoxy Coated Ductile Iron
6Gasket Seal Buna-N (Nitrile)
7Body ASTM A536 65-45-12 Epoxy Coated Ductile Iron
8Stem Nut ASTM A276 304 Stainless Steel
9Lock Washer ASTM A276 302 Stainless Steel
10 Diaphragm Washer ASTM A536 65-45-12 Epoxy Coated Ductile Iron
11 Diaphragm* Buna-N (Nitrile)
12 Inner Bearing Bolts** (3" and Smaller) ASTM A276 304 Stainless Steel
13 Inner Bearing Retainer** (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-N (Nitrile)
17 Upper Stem ASTM A276 304 Stainless Steel
18 Lower Stem ASTM A276 304 Stainless Steel
19 Spring ASTM A276 302 Stainless Steel
20 Disc Retainer ASTM A536 65-45-12 Epoxy Coated Ductile Iron
21 Spacer Washer* NY300 Fiber
22 Disc* Buna-N (Nitrile)
23 Disc Guide ASTM A743 CF8M (316) Stainless Steel
24 Lock Washer ASTM A276 304 Stainless Steel
25 Stem Nut ASTM A276 304 Stainless Steel
26 Seat Ring*** ASTM A743 CF8M (316) Stainless Steel
26A Seat Screw*** (8" and Larger) ASTM A276 304 Stainless Steel
27 Seat Gasket * Buna-N (Nitrile)
8
9
10
10
12
13A
13
14
15
16
17
18
19
20
21
22
23
24
26A
25
26
27
11
1
2
3
4
5
6
7
8
9
10
10
12
13A
13
14
15
16
17
18
19
20
21
22
23
24
26A
25
26
27
11
1
2
3
4
5
6
7
* Contained in Main Valve Repair Kit
**4 inch and larger valves do not require Bearing Bolts
***6 inch and smaller valves, Seat Ring is threaded
ACV Assembly Diagram – Series 985GD-20

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NOTES

IOM-A-ACV-985-20_685-20 2115 EDP# 1917104 © 2021 Watts
USA: Backflow T: [phone] • F: [phone] • AmesFireWater.com
USA: Control Valves T: [phone] • F: [phone] • AmesFireWater.com
Canada: T: [phone] • F: [phone] • AmesFireWater.ca
Latin America: T: (52) 55-4122-0138 • AmesFireWater.com