Watts M518 / M1518 User Manual
Mustang series basic valves, Standard materials, Operating pressure
Mustang Series Basic Valves
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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.
ES-ACV-M518-M1518
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
M518 (Globe)
M1518 (Angle)
M518 / M1518
Full Port Ductile Iron Dual Chamber
Basic Valve with Mechanical
Check Feature
The Watts ACV Models M518 and M1518 are full port, dual
chamber basic valves that incorporate a two-piece telescoping
disc and diaphragm assembly. This assembly is the only moving
part within the valve, allowing it to open or close as commanded
by the pilot control system. The lower portion of this two-piece
assembly is a mechanical check feature, which acts indepen-
dent of diaphragm position or pilot control system, and provides
immediate check action when flow ceases.
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 dia-
phragm chamber and released from the upper diaphragm cham-
ber the valve travels to a full open position.
Model M518: Globe Pattern Dual Chamber Basic Valve with
Mechanical Check Feature
Model M1518: Angle Pattern Dual Chamber Basic Valve with
Mechanical Check Feature
Dimensions
Valve Size
Globe
Thread
Globe 150# Globe 300#
Cover To
Center
Angle
Thread
Angle 150# Angle 300#
Angle
Thread
Angle 150# Angle 300# Port Size
Port Size
Port Size
Shipping
Weights*
A
B
C
D
E
F
G
H
I
J
K
L
M
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm lbs. kgs.
2
50
9
3
⁄
8
238
9
3
⁄
8
238
10
254 8
9
⁄
16
217
4
102
4
3
⁄
4
121
5
127
3
1
⁄
4
83
3
1
⁄
4
83
3
1
⁄
2
89
3
⁄
8
10
1
⁄
2
13
1
⁄
4
6
45
20
2
1
⁄
2
65
11
279
11
279 11
5
⁄
8
295 10
5
⁄
16
262
5
1
⁄
2
140
5
1
⁄
2
140
5
7
⁄
8
149
4
102
4
102 4
5
⁄
16
110
1
⁄
2
13
1
⁄
2
13
1
⁄
2
13
70
32
3
80
12
1
⁄
2
318
12
305 13
1
⁄
4
337 11
3
⁄
16
284
6
1
⁄
4
159
6
152
6
3
⁄
8
162
4
1
⁄
2
114
4
102
4
3
⁄
8
111
1
⁄
2
13
1
⁄
2
13
1
⁄
2
13
100
45
4
100
15
381 15
5
⁄
8
397 14
1
⁄
4
362
7
1
⁄
2
191
7
7
⁄
8
200
5
127 5
5
⁄
16
135
3
⁄
4
19
3
⁄
4
19
1
⁄
2
13
200
91
6
150
20
508
21
533 18
7
⁄
16
468
10
254 10
1
⁄
2
267
6
152
6
1
⁄
2
165
3
⁄
4
19
3
⁄
4
19
3
⁄
4
19
340 154
8
200
25
3
⁄
8
645 26
3
⁄
8
670 21
13
⁄
16
554
12
3
⁄
4
324 13
1
⁄
4
337
8
203
8
1
⁄
2
216
1
25
1
25
1
25
665 302
10
250
29
3
⁄
4
756 31
1
⁄
8
791 23
3
⁄
8
594
14
7
⁄
8
378 15
9
⁄
16
395
8
5
⁄
8
219 9
5
⁄
16
237
1
25
1
25
1
25
980 445
12
300
34 864 35
1
⁄
2
902 29
5
⁄
16
745
17
432 17
3
⁄
4
451
13
3
⁄
4
349 14
1
⁄
2
368
1
25
1
1
⁄
4
32
1
25 1720 780
14
350
39 991 40
1
⁄
2
1029 32
813
19
1
⁄
2
495 20
1
⁄
4
514
14
7
⁄
8
378 15
5
⁄
8
397
1
25
1
1
⁄
2
38
1
25 2600 1179
16
400
41
3
⁄
8
1051 43
1
⁄
2
1105 35
889
20
13
⁄
16
529 21
5
⁄
8
549
15
11
⁄
16
398 16
1
⁄
2
419
1
25
2
51
1
25 3300 1497
*Estimated in lbs.
L
K
K
M
D
K
A
B
C
H I J
E
F
G