Watts M1115-3 User Manual
Mu s t a n g se r i e s
1
X X
XX
Y/FC
P/L
2
CLOSES VALVE
OPENS VALVE
FLOW
3
4
3
(AOS)
Schematic
PRESSURE REDUCING VALVE
w i t h HYDRAULIC CHECK FEATURE
06/08
M115-3 (Globe)
M1115-3 (Angle)
Throttles to reduce high upstream pressure to •
constant lower downstream pressure
Hydraulic Check Feature prevents ow reversal•
Reducing set-point is adjustable•
Standard Components
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Check Valve
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 Check Valve is designed to automatically reduce a
uctuating higher upstream pressure to a constant lower downstream pressure, and close drip-tight when
downstream pressure becomes greater than 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.
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 ow. Normal pressure reducing
operation resumes when upstream pressure exceeds downstream pressure.
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
M115-3 (Globe)
M1115-3 (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)
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
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
M115-3 (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.
M1115-3 (Angle)
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
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