Watts M1115-7 User Manual
Mu s t a n g se r i e s
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)
Schematic
Throttles to reduce high upstream pressure to •
constant lower downstream pressure
Closes quickly when downstream pressure •
exceeds reduced pressure setpoint
PRESSURE REDUCING VALVE
w i t h SURGE CONTROL FEATURE
06/08
M115-7 (Globe)
M1115-7 (Angle)
Ideal for use when high capacity on-off equipment is •
installed downstream
Reducing and Surge Control setpoints are separately •
adjustable
Standard Components
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Downstream Surge Control
4 – Fixed Orice
Options & Accessories
X – Isolation Cocks ○
FC – Flo-Clean Strainer ○
Y – Y-Strainer (Replaces Flo-Clean) ○
ACS – Adjustable Closing Speed ○
(Replaces Fixed Orice)
AOS – Adjustable Opening Speed ○
P – Position Indicator ○
L – Limit Switch ○
(2)
(1)
(3)
(3)
(1)
Standard 3” & Smaller
(2)
Standard 4” & Larger
(3)
Optional All Sizes
(2)
(3)
(1)
Operations
The Watts ACV Combination Pressure Reducing and Surge Control Valve is designed to automatically reduce a
uctuating 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 uid out of the main valve cover chamber) when downstream pressure is below the adjustable setpoint,
and 2) Close (allowing uid to ll 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.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
Mu s t a n g se r i e s
L
K
K
D
K
A
B
C
E
F
G
H
I J
M115-7 (Globe)
M1115-7 (Angle)
Materials
Globe
Angle
Body & Cover: Ductile Iron ASTM A536
Coating: NSF Listed Fusion Bonded
Epoxy Lined and Coated
Trim: 316 Stainless Steel
Elastomers: Buna-N (standard)
EPDM
Viton
Stem, Nut & Stainless Steel
Spring:
Operating Pressure Operating Temperature Pilot System Tubing & Fittings
Threaded = 400 psi
150 Flanged = 250 psi
300 Flanged = 400 psi
Buna-N: 160°F Maximum
EPDM: 300°F Maximum
Viton: 250°F Maximum
Reducing Control Copper / Brass (Standard)
30-300 psi (Standard) Stainless Steel (Optional)
0-30 psi (Optional)
Surge Control
20-200 psi (Standard)
0-30 psi (Optional)
Dimensions
A B C D E F G H I J K L
VALVE
GLOBE
SIZE
1-1/4 7-1/4 - - 5-1/2 3-1/4 - - 1-7/8 - - 3/8 1/4 20
1-1/2 7-1/4 8-1/2 9 5-1/2 3-1/4 4 4-1/4 1-7/8 4 4-1/4 3/8 1/4 25
2-1/2 11 11 11-5/8 7-1/2 5-1/2 5-1/2 5-7/8 4 4 4-5/16 1/2 1/2 65
THRD.
2 9-3/8 9-3/8 10 6-1/2 4-3/4 4-3/4 5 3-1/4 3-1/4 3-1/2 3/8 1/2 40
3 12-1/2 12 13-1/4 8-1/4 6-1/4 6 6-3/8 4-1/2 4 4-3/8 1/2 1/2 95
4 - 15 15-5/8 10-5/8 - 7-1/2 7-7/8 - 5 5-5/16 3/4 3/4 190
6 - 20 21 13-3/8 - 10 10-1/2 - 6 6-1/2 3/4 3/4 320
8 - 25-3/8 26-3/8 16 - 12-3/4 13-1/4 - 8 8-1/2 1 1 650
10 - 29-3/4 31-1/8 17-1/8 - 14-7/8 15-9/16 - 8-5/8 9-5/16 1 1 940
GLOBE
150#
GLOBE
300#
COVER TO
CENTER
ANGLE
THRD.
ANGLE
150#
ANGLE
300#
ANGLE
THRD.
ANGLE
150#
ANGLE
300#
PORT
For larger sizes consult factory
SIZE
PORT
SIZE
SHIPPING
WEIGHTS*
Valve Cover Chamber Capacity
Valve Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10
U.S. Gal - - - - - - -
.oz. 4 4 4 10 10 22 70
- -
1-1/4 2-1/2
Valve Travel
Valve Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10
Travel (in) 3/8 3/8 1/2 5/8 3/4 1 1-1/2 2 2-1/2
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
CAVITATION ZONE
INLET PRESSURE - PSI
OUTLET PRESSURE - PSI
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0 10 20 40 50 60 70 80 90
130 14012011 0100
30
CAVITATION CHART
M115-7 (Globe)
Mu s t a n g se r i e s
Sizing
Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10
Maximum Continuous (GPM) 95 130 210 300 485 800 1850 3100 5000
Maximum Intermittent (GPM) 119 161 265 390 590 1000 2300 4000 6250
Minimum Continuous (GPM) 1 1 1 20 30 50 115 200 300
Maximum continuous ow based on velocity of 20 ft. per second.
Maximum intermittent ow based on velocity of 25 ft. per second.
Minimum continuous ow based on velocity of 1 ft. per second.
NOTE: The above chart is a suggested guide. Inlet pressure, outlet pressure, minumum, normal and maximum ow rates should
be considered for specic valve sizing. Contact Watts ACV for details.
Cavitation Chart
After selecting the valve size, locate inlet and outlet pressures on this chart. If the intersection point falls
in the shaded area, cavitation can occur. Operation of valves continually in the cavitation zone should be
avoided. Consult Watts ACV for alternatives.
M1115-7 (Angle)
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
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