ON-OFF FLOAT VALVE with
PRESSURE SUSTAINING FEATURE
01/06
970 Series
Operation
The AMES Model 972-20 / 672-20 On-Off Float Control Valve with Pressure Sustaining Feature is designed
to open fully or close drip-tight as commanded by the Float Control Pilot. The Float Pilot may be either valve
or remote mounted. The valve closes drip tight when water level reaches the adjustable high-level setpoint,
and opens fully when water level is below the adjustable low-level setpoint, allowing a calculated “drawdown” of water level to increase tank circulation. The valve will also throttle to sustain a minimum upstream
pressure during tank lling operations.
The On-Off Float Pilot directs upstream pressure into and out of the cover chamber of the 3-way Accelerator
Pilot. When the cover of the Accelerator Pilot is pressurized, the main valve cover chamber is vented
downstream, causing the valve to open. When the cover of the Accelerator Pilot is de-pressurized, the
main valve cover chamber is connected to upstream pressure, causing the valve to close drip tight. Valve
opening and closing speeds are separately adjustable. When water level reaches the adjustable high-level
setpoint, the Float Pilot de-pressurizes the cover chamber of the 3-Way Accelerator, closing the valve drip
tight. The valve remains closed as water level decreases. When water level reaches the adjustable lowlevel setpoint, the Float Pilot pressurizes the cover chamber of the 3-Way Accelerator, opening the valve.
High and low levels are separately adjustable by positioning stop collars on the oat rod(s) at desired
opening and closing setpoints.
Model
672-20
972-20
The normally closed sustaining pilot remains open when upstream pressure is above the adjustable setpoint,
and modulates toward a closed position if upstream pressure falls below the setpoint. As the sustaining pilot
closes, uid is directed into the main valve cover chamber, allowing the valve to modulate toward a closed
position, raising upstream pressure. Normal on-off oat control operation resumes when upstream pressure
is above the sustaining pilot setpoint.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.amesrewater.com
ON-OFF FLOAT VALVE with
PRESSURE SUSTAINING FEATURE
01/06
970 Series
Installation Guidelines
• Prior to installation, ush line to remove debris.
• Install valve horizontally “in line” (cover facing UP), so ow arrow matches ow through the line. Avoid
installing valves 6” and larger vertically. Consult factory prior to ordering if installation is other than
described.
• Install inlet and outlet isolation valves. NOTE: When using buttery valves, insure disc does not contact
control valve. Damage or improper valve seating may occur.
• Provide adequate clearance for valve servicing and maintenance.
• Install pressure gauge to monitor valve inlet pressure. If On-Off Float Pilot is remotely mounted it should
be eld connected with 3/8” minimum copper tubing in accordance with factory piping schematic.
• Float Pilot, Rods, and Ball should be mounted in a eld installed “stilling well” for protection against
surface turbulence and interference.
• Additional 12” Float Rods available. Consult Factory.
Other AMES Float Control Valves
972 / 672 On-Off Float Control Valve (4” & smaller)
972-19 / 672-19 On-Off Float Control Valve (6” & larger)
979 / 679 Modulating Float Control Valve
979-15 / 679-15 Modulating Float Control Valve with Solenoid (On-Off) Feature
979-20 / 679-20 Modulating Float Control Valve with Pressure Sustaining Feature
Model
672-20
972-20
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.amesrewater.com
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