Watts M1118-3 User Manual
R
NON-SURGE CHECK VALVE
(4” and Smaller)
01/05
M118-3 or M6118-3 (Globe)
Mustang Series
Operation
The Watts ACV Non-Surge Check Valve is designed to control pipeline surges caused by flow reversal
by slowly opening and closing at separate adjustable rates. The valve opens when upstream pressure is
greater than downstream pressure. When upstream pressure is greater than downstream pressure, the
Adjustable Opening Speed Control allows fluid out of the main valve cover chamber, providing a controlled
rate of opening. When a pressure reversal occurs and downstream pressure becomes higher than upstream
pressure, the Adjustable Closing Speed Control allows the higher downstream pressure to enter the main
valve cover chamber, providing a controlled rate of closure.
NOTE: A maximum pipeline velocity of six feet-per-second is recommended when installing this type of
check valve. When pipeline velocities exceed six FPS, consideration should be given to adding a Watts
ACV Model M116 Pressure Relief Valve or Model M116-52 Combination Surge Anticipator and Pressure
Relief Valve to the system.
M1118-3 or M61118-3 (Angle)
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 gauges to monitor valve inlet and outlet pressure.
Other Watts ACV Control Valves
M116 / M6116 Pressure Relief Valve
M116-52 / M6116-52 Surge Anticipator and Pressure Relief Valve
M118-4 / M6118-4 Non-Surge Check Valve (6” & larger)
M513-5 / M6513-5 Pump Control Valve
M513-AK / M6513-AK Pump Control Valve with High Capacity Pilot System
M513-6 / M6513-6 Deep Well Pump Control Valve
M513-14 / M6513-14 Deep Well Pump Control Valve with Pressure Relief Feature
M113-21 / M6113-21 Pump Control Valve
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
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