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
