Ustang, Eries, Sizing – Watts M1115-74 User Manual
Page 3: Low-flow by-pass, Cavitation chart, Pressure drop flo w
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•
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www.watts.com
M
ustang
s
eries
M115-74 (Globe)
M1115-74 (Angle)
Sizing
Size (in)
1-1/4
1-1/2
2
2-1/2
3
4
6
8
10
Maximum Continuous (GPM)
100
150
200
300
460
800
1800
3100
4900
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 flow based on velocity of 20 ft. per second.
Maximum intermittent flow based on velocity of 25 ft. per second.
Minimum continuous flow based on velocity of 1 ft. per second.
Pressure Drop
Flo
w
20
3/4”
1/2”
15
10
5
0
0
10
20
30
40
Low-Flow By-Pass
Valve Size (in)
By-Pass (in)
Adjustment
Range
2-1/2 &
Smaller
1/2
20-200 psi
3 & Larger
3/4
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
130 140
120
110
100
30
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 continu-
ally in the cavitation zone should be
avoided. Consult Watts ACV for al-
ternatives.
Cavitation Chart
NOTE: The above chart is a suggested guide. Inlet pressure, outlet pressure, minumum, normal and maximum flow rates should
be considered for specific valve sizing. Contact Watts ACV for details.
A
B
C
D
E
F
G
H
I
J
K
L
VALVE
SIZE
GLOBE
THRD.
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*
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
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
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
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