background image

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

X

X

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 

Содержание 685GD-20

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Отзывы: