Watts F1110-18 User Manual
R
ON-OFF FLOAT VALVE with
PRESSURE SUSTAINING FEATURE
01/05
F110-18 (Globe)
Classic Series
Operation
The Watts ACV 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 “draw-down” of water
level to increase tank circulation. The valve will also throttle to sustain a minimum upstream pressure during
tank filling 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 low-level 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 float rod(s) at desired opening and closing
setpoints.
F1110-18 (Angle)
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, fluid is directed into the main valve cover chamber, allowing the valve to modulate toward a closed
position, raising upstream pressure. Normal on-off float 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.wattsacv.com
R
ON-OFF FLOAT VALVE with
PRESSURE SUSTAINING FEATURE
01/05
F110-18 (Globe)
Classic Series
Installation Guidelines
• Prior to installation, flush line to remove debris.
• Install valve horizontally “in line” (cover facing UP), so flow arrow matches flow 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 butterfly 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 field connected with 3/8” minimum copper tubing in accordance with factory piping schematic.
• Float Pilot, Rods, and Ball should be mounted in a field installed “stilling well” for protection against
surface turbulence and interference.
• Additional 12” Float Rods available. Consult Factory.
F1110-18 (Angle)
Other Watts ACV Float Control Valves
F110-10 / F1110-10 Modulating Float Control Valve
F110-13 / F1110-13 Modulating Float Control Valve with Pressure Sustaining Feature
F110-AS / F1110-AS Modulating Float Control Valve with Solenoid (On-Off) Feature
F110-14 / F1110-14 On-Off Float Control Valve
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
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