Watts M6500, M61500 User Manual
Mustang Series Basic Valves
ES-ACV-M6500-M61500
Job Name
Job Location
Engineer
Approval
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M6500 / M61500
Reduced Port Ductile Iron Dual
Chamber Basic Valve
The Watts ACV Models M6500 and M61500 are reduced port,
dual chamber basic valves that incorporate a one-piece disc
and diaphragm assembly. This assembly is the only moving part
within the valve allowing it to open, close, or modulate as commanded by the pilot control system. The reduced port design
offers improved low-flow performance as compared to the full
port valve on the same service.
When pressure is applied to the upper diaphragm chamber and
released from the lower diaphragm chamber, the valve travels
to a closed position. When pressure is applied to the lower
diaphragm chamber and released from the upper diaphragm
chamber the valve travels to a full open position. When pressure
is balanced between the upper and lower diaphragm chambers,
the valve will hold an intermediate position until commanded to
modulate open or closed by the pilot control system.
Model M6500: Globe Pattern Dual Chamber Basic Valve
Model M61500: Angle Pattern Dual Chamber Basic Valve
Contractor
Approval
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Contractor’s P.O. No.
Representative
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M6500 (Globe) M61500 (Angle)
C
A
B
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I
K
J
H
F G
D
E
Dimensions
Valve Size Globe 150# Globe 300# Cover To Center Angle 150# Angle 300# Angle 150# Angle 300# Port Size Port Size Port Size Shipping
A B C D E F G H I J
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
3 80 10
4 100 13
6 150 17
8 200 21
10 250 26 660 27
12 300 30 762 31
16 400 35 889 36
18 450 48 1219 49
20 500 48 1219 49
24 600 48 1219 49
Standard Materials
Body & Cover: Ductile Iron ASTM A536
Coating: NSF Listed Fusion Bonded Epoxy Lined
1
⁄4 260 11 279 91⁄16 230
7
⁄8 352 141⁄2 368 1111⁄16 297 615⁄16 176 71⁄4 184 51⁄2 140 513⁄16 1481⁄2 131⁄2 131⁄2 13 50 23
3
⁄4 451 185⁄8 473 151⁄4 387 87⁄8 225 93⁄8 238 63⁄4 171 71⁄4 1843⁄4 193⁄4 193⁄4 19 130 59
3
⁄8 543 223⁄8 568 201⁄8 511 1011⁄16 271 113⁄16 284 71⁄4 184 73⁄4 1973⁄4 193⁄4 193⁄4 19 210 95
3
⁄8 695 2311⁄16 602 1 25 1 25 1 25 363 165
1
⁄2 800 261⁄4 667 1 25 1 25 1 25 528 240
5
⁄8 930 341⁄8 867 1 25 11⁄4 32 1 25 826 375
5
⁄8 1260 41 1041 1 25 2 51 1 25 1365 620
5
⁄8 1260 41 1041 1 25 2 51 1 25 1390 630
3
⁄4 1260 41 1041 1 25 2 51 1 25 1485 674
3
⁄8 101⁄2 131⁄2 13 31 14
Operating Pressure
Threaded = 400psi (27.6 bar)
and Coated
150 Flanged = 250psi (17.2 bar)
300 Flanged = 400psi (27.6 bar)
Trim: 316 Stainless Steel
Elastomers: Buna-N (standard)
EPDM (optional)
Viton
®
(optional)
Stem, Nut &
Operating Temperature
Buna-N: 160°F (71°C) Maximum
EPDM: 300°F (140°C Maximum
®
Viton
: 250°F (121°C) Maximum
Spring: Stainless Steel
Weights*
*Estimated in lbs.
Viton® is a registered trademark of DuPont Dow Elastomers.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
M6500 / M61500 — Reduced Port Ductile Iron Dual Chamber
Basic Valve
Flow Data - ACV M6500 (Globe) / M61500 (Angle)
Valve Size - Inches 3 4 6 8 10 12 16 18 20 24
Maximum Continuous
Flow Rate Gpm (Water)
Maximum Intermittent
Flow Rate Gpm (Water)
CV Factor GPM (Globe) 60 133 224 489 932 1428 2067 2881 2881 2881
CV Factor GPM (Angle) 132 237 534
Maximum continuous flow based on velocity of 20 ft. per second.
Maximum intermittent flow based on velocity of 25 ft. per second.
The Cv Factor of a value is the flow rate in US GPM at 60°F that will cause a 1psi drop in pressure.
The factors stated are based upon a fully open valve.
Cv factor can be used in the following equations to determine Flow (Q) and Pressure Drop (∆P):
Q (Flow) = Cv√∆P ∆P (Pressure Drop) = (Q/Cv)
210 485 800 1850 3100 5000 7000 11100 11100 11100
265 590 1000 2300 4000 6250 8900 14100 14100 14100
2
Estimated
Headloss
100
80
60
40
30
20
10
8
6
4
Pressure Drop (psi)
3
2
Angle
4
Globe
3
2 4 6 8 10 20 40 60 80 100 200 500 1000 2000 5000 10000 20000
6
4
6
8
8
10
12
18 / 20 / 24
16
Flow Rate - Gallons per minute (Water)
Valve Cover Chamber Capacity
Valve Size - Inches 3 4 6 8 10 12 16 18 20 24
fluid oz. 4 10 22 70
U.S. Gal 1-1/4 2-1/2 4 9-1/2 9-1/2 9-1/2
Valve Travel
Valve Size - Inches 3 4 6 8 10 12 16 18 20 24
Travel - Inches 1/2 3/4 1 1-1/2 2 2-1/2 3 4 4 4
A Watts Water Technologies Company
ES-ACV-M6500-M61500 1219 © 2012 Watts
USA: Tel. (713) 943-0688 • (713) 944-9445 • www.watts.com
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