2
ES-A-ACV-LF985GD-20 2115
© 2021 Watts
Deep Well Control Valve with Pressure Relief Feature
Full Port Ductile Iron Dual Chamber Valve
Features
• Installed on branch of tee off main pumping header
• Normally open construction
• Discharges to atmosphere on pump start-up
• Closes slowly diverting pressure into system during pumping
cycle
• Opens slowly on pump shut-off
• Limit Switch turns pump off when valve is fully open
• Pressure Relief Feature protects system during pumping cycle
• Adjustable Opening and Closing Speed
• Solenoid equipped with Manual Operator
• Relief setpoint is adjustable
1
4
X
X
X
X
X
6
2(L)
5
CLOSES VALVE
OPENS VALVE
FLOW
X/Y
(Supply Pressure)
3
Standard Components
Options and Accessories
{
FC – Flo-Clean Strainer
{
L – Dual Limit Switch
Operation
1 – Main Valve (900GD - 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
LEAD FREE
*
The information contained herein is not intended to replace the full
product installation and safety information available or the experi-
ence of a trained product installer. You are required to thoroughly
read all installation instructions and product safety information
before beginning the installation of this product.
NOTICE
* The wetted surface of this product contacted by consumable water
contains less than 0.25% of lead by weight.
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 atmosphere
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 closing 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 atmo-
sphere or available floor drain. The valve opens at an adjustable
rate, gradually reducing pumping pressure, allowing the system
check valve to slowly close. Rate of valve opening is controlled by
the adjustable opening speed control, which restricts the speed at
which fluid and pressure evacuate the cover chamber. 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.
Series LF985GD-20
