Watts S6518 / S61518 User Manual
Stainless steel series basic valves, Operating pressure, Operating temperature
Stainless Steel 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-S6518-S61518
S6518 / S61518
Reduced Port Stainless Steel
Dual Chamber Basic Valve with
Mechanical Check Feature
The Watts ACV Models M6518 and M16518 are reduced port,
dual chamber basic valves that incorporate a two-piece tele-
scoping 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 independent 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
diaphragm chamber and released from the upper diaphragm
chamber the valve travels to a full open position.
The Stainless Steel design offers superior corrosion resistance,
as well as a lightweight alternative to conventional heavy iron
valves. Stainless Steel construction reduces corrosion, reducing
diaphragm wear and the frequency and labor costs associated
with traditional maintenance repairs.
Dimensions
S6518 (Globe)
S61518 (Angle)
Standard Materials
Body, Cover &
304L Stainless Steel (standard)
Flanges:
316L Stainless Steel (optional)
Trim:
316 Stainless Steel
Elastomers:
Buna-N (standard)
EPDM
Viton
®
Stem, Nut & Spring: Stainless Steel
Operating Pressure
Threaded = 400psi (27.6 bar)
150 Flanged = 250psi (17.2 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.
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
1
⁄
2
13
3
⁄
4
19
1
⁄
2
13
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
1
⁄
2
13
3
⁄
4
19
1
⁄
2
13
210
95
10
250
26
660
27
3
⁄
8
695
23
11
⁄
16
602
1
25
1
25
1
⁄
2
13
363
165
12
300
30
762
31
1
⁄
2
800
26
1
⁄
4
667
1
25
1
1
⁄
4
32
1
⁄
2
13
528
240
16
400
35
889
36
5
⁄
8
930
34
1
⁄
8
867
1
25
1
1
⁄
2
38
1
25
826
315
18
450
48
1219
49
5
⁄
8
1260
41
1041
1
25
1
1
⁄
2
38
1
25
1365
619
20
500
48
1219
49
5
⁄
8
1260
41
1041
1
25
1
1
⁄
2
38
1
25
1390
630
24
600
48
1219
49
3
⁄
4
1260
41
1041
1
25
1
1
⁄
2
38
1
25
1485
674
*Estimated in lbs.
A
B
D
E
F G
I
H
C
H
J
Model M6518: Globe Pattern Dual Chamber Basic Valve with
Mechanical Check Feature
Model M61518: Angle Pattern Dual Chamber Basic Valve with
Mechanical Check Feature