Watts S6518, S61518 User Manual
Stainless Steel Series Basic Valves
ES-ACV-S6518-S61518
Job Name
Job Location
Engineer
Approval
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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 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 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.
Contractor
Approval
Contractor’s P.O. No.
Representative
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S6518 (Globe) S61518 (Angle)
I
C
A
B
Model M6518: Globe Pattern Dual Chamber Basic Valve with
Mechanical Check Feature
Model M61518: Angle Pattern Dual Chamber Basic Valve with
Mechanical Check Feature
H
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.
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 & 304L Stainless Steel (standard)
Flanges: 316L Stainless Steel (optional)
3
⁄4 451 185⁄8 473 151⁄4 387 87⁄8 225 93⁄8 238 63⁄4 171 71⁄4 1841⁄2 133⁄4 191⁄2 13 130 59
3
⁄8 543 223⁄8 568 201⁄8 511 1011⁄16 271 113⁄16 284 71⁄4 184 73⁄4 1971⁄2 133⁄4 191⁄2 13 210 95
3
⁄8 695 2311⁄16 602 1 25 1 251⁄2 13 363 165
1
⁄2 800 261⁄4 667 1 25 11⁄4 321⁄2 13 528 240
5
⁄8 930 341⁄8 867 1 25 11⁄2 38 1 25 826 315
5
⁄8 1260 41 1041 1 25 11⁄2 38 1 25 1365 619
5
⁄8 1260 41 1041 1 25 11⁄2 38 1 25 1390 630
3
⁄4 1260 41 1041 1 25 11⁄2 38 1 25 1485 674
Operating Pressure
Threaded = 400psi (27.6 bar)
150 Flanged = 250psi (17.2 bar)
Trim: 316 Stainless Steel
Elastomers: Buna-N (standard)
EPDM
®
Viton
Stem, Nut & Spring: Stainless Steel
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.
Operating Temperature
Buna-N: 160°F (71°C) Maximum
EPDM: 300°F (140°C) Maximum
®
Viton
: 250°F (121°C) Maximum
Weights*
*Estimated in lbs.
S6518 / S61518 — Reduced Port Stainless Steel Dual Chamber
Basic Valve with Mechanical Check Feature
Flow Data - ACV S6518 (Globe) / S61518 (Angle)
Valve Size - Inches 6 8 10 12 16 18 20 24
Maximum Continuous
Flow Rate Gpm (Water)
Maximum Intermittent
Flow Rate Gpm (Water)
CV Factor GPM (Globe) 224 489 932 1428 2067 2881 2881 2881
CV Factor GPM (Angle) 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)
800 1850 3100 5000 7000 11100 11100 11100
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
Globe
6
6
2 4 6 8 10 20 40 60 80 100 200 500 1000 2000 5000 10000 20000
8
8
10
12
18 / 20 / 24
16
Flow Rate - Gallons per minute (Water)
Valve Cover Chamber Capacity
Valve Size - Inches 6 8 10 12 16 18 20 24
fluid oz. 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 6 8 10 12 16 18 20 24
Travel - Inches 1 1-1/2 2 2-1/2 3 4 4 4
A Watts Water Technologies Company
ES-ACV-S6518-S61518 1219 © 2012 Watts
USA: Tel. (713) 943-0688 • (713) 944-9445 • www.watts.com
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