Watts M1115-11 User Manual
R
PRESSURE REDUCING and
SUSTAINING VALVE with
HYDRAULIC CHECK FEATURE
01/05
Mustang Series
Operation
The Watts ACV Combination Pressure Reducing and Sustaining Control Valve with Hydraulic Check Feature
is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream
pressure regardless of varying flow rates, and will throttle to sustain a minimum upstream pressure. It
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) when downstream pressure is above the adjustable
setpoint. A decrease in downstream pressure causes the valve to modulate toward an open position, raising
downstream pressure. An increase in downstream pressure causes the valve to modulate toward a closed
position, lowering downstream pressure.
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 pressure reducing operation resumes when upstream pressure
is above the sustaining pilot setpoint, and downstream pressure is below the reducing pilot setpoint.
M115-11 or M6115-11 (Globe)
M1115-11 or M61115-11 (Angle)
If downstream pressure becomes greater than upstream pressure, downstream pressure is admitted to
the main valve cover chamber, closing the valve and preventing reversal of flow. Normal backpressure or
sustaining operation resumes when upstream pressure exceeds downstream pressure.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
R
PRESSURE REDUCING and
SUSTAINING VALVE with
HYDRAULIC CHECK FEATURE
01/05
Mustang 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 gauges to monitor valve inlet and outlet pressure.
• If installation is subjected to very low flow or potentially static conditions, AMES recommends a pressure
relief valve (1/2” minimum) be installed downstream of the Pressure Reducing Valve for additional system
protection.
Other Watts ACV Pressure Reducing Control Valves
M115 / M6115 Pressure Reducing Valve
M115-2 / M6115-2 Pressure Reducing and Sustaining Valve
M115-3 / M6115-3 Pressure Reducing Valve with Hydraulic Check Feature
M115-4 / M6115-4 Pressure Reducing Valve with Solenoid (On-Off) Feature
M115-7 / M6115-7 Pressure Reducing Valve with Downstream Surge Control Feature
M115-43 / M1115-43 Pressure Reducing and Sustaining Valve with Surge Control Feature
M115-58 / M6115-58 Pressure Reducing Valve with Return Flow Feature
M115-74 / M6115-74 Pressure Reducing Valve with Low Flow By-Pass
M115-11 or M6115-11 (Globe)
M1115-11 or M61115-11 (Angle)
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
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