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Contractor
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Approval
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Contractor’s P.O. No.
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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 with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Mustang Series Basic Valves
ES-ACV-M6500-M61500
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 com-
manded 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
Dimensions
M6500 (Globe) M61500 (Angle)
Standard Materials
Body & Cover: Ductile Iron ASTM A536
Coating: NSF Listed Fusion Bonded Epoxy Lined
and Coated
Trim: 316 Stainless Steel
Elastomers: Buna-N (standard)
EPDM (optional)
Viton
®
(optional)
Stem, Nut &
Spring: Stainless Steel
Operating Pressure
Threaded = 400psi (27.6 bar)
150 Flanged = 250psi (17.2 bar)
300 Flanged = 400psi (27.6 bar)
Operating Temperature
Buna-N: 160°F (71°C) Maximum
EPDM: 300°F (140°C Maximum
Viton
®
: 250°F (121°C) Maximum
Valve Size Globe 150# Globe 300# Cover To Center Angle 150# Angle 300# Angle 150# Angle 300# Port Size Port Size Port Size Shipping
Weights*
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
1
⁄4 260 11 279 9
1
⁄16 230
3
⁄8 10
1
⁄2 13
1
⁄2 13 31 14
4 100 13
7
⁄8 352 14
1
⁄2 368 11
11
⁄16 297 6
15
⁄16 176 7
1
⁄4 184 5
1
⁄2 140 5
13
⁄16 148
1
⁄2 13
1
⁄2 13
1
⁄2 13 50 23
6 150 17
3
⁄4 451 18
5
⁄8 473 15
1
⁄4 387 8
7
⁄8 225 9
3
⁄8 238 6
3
⁄4 171 7
1
⁄4 184
3
⁄4 19
3
⁄4 19
3
⁄4 19 130 59
8 200 21
3
⁄8 543 22
3
⁄8 568 20
1
⁄8 511 10
11
⁄16 271 11
3
⁄16 284 7
1
⁄4 184 7
3
⁄4 197
3
⁄4 19
3
⁄4 19
3
⁄4 19 210 95
10 250 26 660 27
3
⁄8 695 23
11
⁄16 602 1 25 1 25 1 25 363 165
12 300 30 762 31
1
⁄2 800 26
1
⁄4 667 1 25 1 25 1 25 528 240
16 400 35 889 36
5
⁄8 930 34
1
⁄8 867 1 25 1
1
⁄4 32 1 25 826 375
18 450 48 1219 49
5
⁄8 1260 41 1041 1 25 2 51 1 25 1365 620
20 500 48 1219 49
5
⁄8 1260 41 1041 1 25 2 51 1 25 1390 630
24 600 48 1219 49
3
⁄4 1260 41 1041 1 25 2 51 1 25 1485 674
*Estimated in lbs.
J
K
I
C
F G
D
E
A
B
H
(2 pages)
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