2
ES-A-ACV-LF981GD 2115
© 2021 Watts
Pump Control Valve with Pressure Reducing Feature
Full Port Ductile Iron Single Chamber Valve
Features
• Opens at adjustable rate on pump start-up
• Closes at adjustable rate on pump shut-off
• Limit Switch turns pump off when valve closes
• Throttles to reduce higher inlet pressure to constant lower outlet
pressure (adjustable)
• Hydraulic Check Feature prevents flow reversal
• Solenoid equipped with Manual Operator
• Pressure Reducing setpoint is adjustable
1
X
X
Y/FC
2
3(L)
4
5
5
6
7
8
X
X
CLOSES VALVE
OPENS VALVE
FLOW
Standard Components
Options and Accessories
{
FC – Flo-Clean Strainer
{
L – Dual Limit Switch
Operation
1 – Main Valve (905GD - Single Chamber)
2 – Model 22-1 Accelerator Control
3 – Limit Switch
4 – 3-Way Solenoid
5 – Check Valve
6 – Adjustable Opening Speed
7 – Adjustable Closing Speed
8 – Pressure Reducing 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 Pump Control Valve with Pressure Reducing Feature is
designed to minimize the surges associated with the starting
and stopping of pumps. The valve slowly opens and closes as
required to control pumping related surges, and throttles to main-
tain a maximum downstream pressure during the pumping cycle.
The pump starts and stops against a closed valve.
Pump Start Up:
When the pump is signaled to start, the 3-Way
Solenoid is energized, directing pressure into the cover chamber
of the 3-way Accelerator Pilot. The Accelerator Pilot allows the
main valve cover chamber to be vented downstream, causing the
valve to open at a controlled rate, gradually admitting pumping
pressure into the distribution system. The rate of opening is con-
trolled by the adjustable opening speed control, which restricts
the speed of fluid and pressure evacuating the main valve cover
chamber.
Pressure Reducing Feature:
During the pumping cycle, the valve
acts as a Pressure Reducing Control Valve. Throttling (Pressure
Reducing) action is controlled by a normally open, pressure
reducing pilot designed to: 1) Open (allowing fluid out of the main
valve cover chamber) when downstream pressure is below the
adjustable setpoint, and 2) Close (allowing fluid to fill the main
valve cover chamber through the integral orifice of the Accelerator
Pilot) when downstream pressure is above the adjustable setpoint.
A decrease in downstream pressure causes the valve to modu-
late toward an open position, raising downstream pressure. An
increase in downstream pressure causes the valve to modulate
towards a closed
position, lowering downstream pressure.
Pump Shutdown:
When the pump is signaled to turn off, the
3-Way Solenoid is de-energized, venting the cover chamber of
the 3-way Accelerator Pilot. The Accelerator Pilot allows the main
valve cover chamber to be connected to upstream pressure,
causing the valve to close at a controlled rate. The valve slowly
begins to close while the pump continues to operate. The clos-
ing rate of the valve is controlled by the adjustable closing speed
control, which restricts the speed of fluid and pressure entering
the main valve cover chamber. When the valve reaches the closed
position, the limit switch is actuated, turning the pump off.
Hydraulic Check Feature:
When the pump is turned off and
downstream pressure is greater than upstream pressure, down-
stream pressure is admitted to the main valve cover chamber
through a check valve in the pilot control system, closing the
valve, preventing reversal of flow.
Manual Operation:
Engaging the Solenoid Manual operator
simulates power to the solenoid, manually opening the main valve.
Disengaging the Solenoid Manual operator returns the valve to the
closed position.
Series LF981GD
