Watts M1114 - Manual

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
01/05
R
Mustang Series
RATE-OF-FLOW VALVE
M114 or M6114 (Globe)
M1114 or M61114 (Angle)
Operation
The Watts ACV Rate-of-Flow Control Valve is designed to automatically limit flow rate to a constant,
adjustable, maximum. It is controlled by a normally open, differential control pilot designed to: 1) Open
(allowing fluid out of the main valve cover chamber) when the differential pressure across the orifice plate
is below the adjustable set point, and, 2) Close (allowing fluid to fill the main valve cover chamber) when
the differential pressure across the orifice plate is above the adjustable set point. A decrease in differential
pressure causes the valve to modulate towards an open position, increasing flow rate. An increase in
differential pressure causes the valve to modulate towards a closed position, decreasing flow rate.
The Orifice Plate Assembly should be installed three to five pipe diameters downstream of the Rate-
of-Flow Valve, and field connected with 3/8” minimum copper tubing in accordance with factory
piping schematic. Please specify desired flow rate prior to ordering.
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” or large 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 gauges to monitor valve inlet and outlet pressure.
• Install Orifice Plate Assembly (provided) 3 to 5 pipe diameters downstream of the Rate-of-Flow Valve
with the sensing connections offset from top of pipeline to avoid air accumulation. The Orifice Plate
Assembly should not be installed next to a butterfly valve.
• Connect Orifice Plate Assembly to Rate-of-Flow Pilot using 3/8” diameter minimum copper tubing (field
installed) in accordance with factory piping schematic.
Other Watts ACV Rate-of-Flow Control Valves
M114-1 / M6114-1 Rate-of-Flow Control Valve with Solenoid (On-Off) Feature
M114-2 / M6114-2 Rate-of-Flow Control Valve with Pressure Reducing Feature
M114-3 / M6114-3 Rate-of-Flow Control Valve with Hydraulic Check Feature
M114-8 / M6114-8 Rate-of-Flow Control Valve with Pressure Sustaining Feature