Watts M1115-2 User Manual
PRESSURE REDUCING CONTROL VALVE
WITH PRESSURE SUSTAINING FEATURE
Mustang series
Schematic
• Throttles to reduce high upstream pressure to constant
lower downstream pressure
• Throttles to maintain minimum upstream pressure
05/09
M115-2 (Globe)
M1115-2 (Angle)
• Reducing and Sustaining setpoints are separately
adjustable
3
2
Standard Components
1 – Main Valve (Single Chamber)
P/L
(AOS)
4
X
2 – Pressure Reducing Control
3 – Pressure Sustaining Control
4 – Fixed Orice
Options & Accessories
(2)
(1)
(3)
(3)
(1)
Standard 3” & Smaller
(2)
Standard 4” & Larger
(3)
Optional All Sizes
(2)
(3)
(1)
X
Y/FC
FLOW
CLOSES VALVE
OPENS VALVE
○ X – Isolation Cocks
X
1
○ 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
Operations
The Combination Pressure Reducing and Pressure Sustaining Control Valve is designed to automatically
reduce a uctuating higher upstream pressure to a constant lower downstream pressure regardless of
varying ow 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 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.
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, uid 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.
12541 Gulf Freeway • Houston, Texas 77034 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
Mustang series
M115-2 (Globe)
M1115-2 (Angle)
Materials
Body & Cover: Ductile Iron ASTM A536
D
Globe
K
Angle
L
K
Coating: NSF Listed Fusion Bonded
Epoxy Lined and Coated
Trim: 316 Stainless Steel
K
Elastomers: Buna-N (standard)
EPDM
Viton
Stem, Nut & Stainless Steel
Spring:
A
B
C
E
F
G
H
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)
Sustaining Control
20-200 psi (Standard)
0-30 psi (Optional)
I J
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
SIZE
PORT
SIZE
SHIPPING
WEIGHTS*
For larger sizes consult factory
Valve Cover Chamber Capacity
Valve Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10
.oz. 4 4 4 10 10 22 70
U.S. Gal - - - - - - -
- -
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
12541 Gulf Freeway • Houston, Texas 77034 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
CAVITATION CHART
M115-2 (Globe)
Mustang series
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.
M1115-2 (Angle)
INLET PRESSURE - PSI
300
280
260
240
220
200
180
160
140
120
100
80
60
CAVITATION ZONE
40
20
0 10 20 40 50 60 70 80 90
12541 Gulf Freeway • Houston, Texas 77034 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
30
130 140120110100
OUTLET PRESSURE - PSI
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