Watts M1115-7 - Manual

X – Isolation Cocks ○
FC – Flo-Clean Strainer ○
Y – Y-Strainer (Replaces Flo-Clean) ○
ACS – Adjustable Closing Speed ○
(Replaces Fixed Orifice)
AOS – Adjustable Opening Speed ○
P – Position Indicator ○
L – Limit Switch ○
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
06/08
M
ustang
s
eries
Standard Components
Options & Accessories
(3)
(3)
(3)
(2)
(2)
(1)
(1)
Standard 3” & Smaller
Standard 4” & Larger
Optional All Sizes (3)
(2)
(1)
Schematic
910 link
Throttles to reduce high upstream pressure to •
constant lower downstream pressure
Closes quickly when downstream pressure •
exceeds reduced pressure setpoint
Ideal for use when high capacity on-off equipment is •
installed downstream
Reducing and Surge Control setpoints are separately •
adjustable
1
X X
X X
Y/FC
P/L
4
2
CLOSES VALVE
OPENS VALVE
FLOW
3
(AOS)
1
X X
X X
Y/FC
P/L
4
2
CLOSES VALVE
OPENS VALVE
FLOW
3
(AOS)
M115-7 (Globe)
M1115-7 (Angle)
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Downstream Surge Control
4 – Fixed Orifice
PRESSURE REDUCING VALVE
with
SURGE CONTROL FEATURE
Operations
The Watts ACV Combination Pressure Reducing and Surge Control Valve is designed to automatically reduce a
fluctuating higher upstream pressure to a constant lower downstream pressure, and will quickly modulate toward
a closed position if downstream pressure suddenly becomes greater than the desired regulated setpoint. The
quick closing action prevents possible damaging high inlet pressure from passing through the valve to downstream
piping. Normal regulating action 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.
If downstream pressure suddenly becomes greater than the desired regulated setpoint, the normally closed
surge control pilot opens and rapidly admits higher inlet pressure into the valve cover, increasing rate of valve
closure. Normal pressure reducing operation resumes when downstream pressure decreases below the desired
regulated setpoint.