Watts M518, M1518 User Manual

Mustang Series Basic Valves

ES-ACV-M518-M1518

Job Name

Job Location

Engineer

Approval

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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 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.

Model M518: Globe Pattern Dual Chamber Basic Valve with Mechanical Check Feature

Model M1518: Angle Pattern Dual Chamber Basic Valve with Mechanical Check Feature

Contractor

Approval

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Contractor’s P.O. No.

Representative

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M518 (Globe) M1518 (Angle)

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E F

Dimensions

Valve Size Globe

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

⁄2 65 11 279 11 279 115⁄8 295 105⁄16 262 51⁄2 140 51⁄2 140 57⁄8 149 4 102 4 102 45⁄16 1101⁄2 131⁄2 131⁄2 13 70 32

3 80 12

4 100 15 381 15

6 150 20 508 21 533 18

8 200 25

10 250 29

12 300 34 864 35

14 350 39 991 40

16 400 41

Standard Materials

Body & Cover: Ductile Iron ASTM A536 Coating: NSF Listed Fusion Bonded Epoxy Lined

Trim: 316 Stainless Steel Elastomers: Buna-N (standard)

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.

Globe 150# Globe 300# Cover To

Thread

A B C D E F G H I J K L M

⁄8 238 93⁄8 238 10 254 89⁄16 217 4 102 43⁄4 121 5 127 31⁄4 83 31⁄4 83 31⁄2 893⁄8 101⁄2 131⁄4 6 45 20

⁄2 318 12 305 131⁄4 337 113⁄16 284 61⁄4 159 6 152 63⁄8 162 41⁄2 114 4 102 43⁄8 1111⁄2 131⁄2 131⁄2 13 100 45

⁄8 645 263⁄8 670 2113⁄16 554 123⁄4 324 131⁄4 337 8 203 81⁄2 216 1 25 1 25 1 25 665 302

⁄4 756 311⁄8 791 233⁄8 594 147⁄8 378 159⁄16 395 85⁄8 219 95⁄16 237 1 25 1 25 1 25 980 445

⁄8 1051 431⁄2 1105 35 889 2013⁄16 529 215⁄8 549 1511⁄16 398 161⁄2 419 1 25 2 51 1 25 3300 1497

⁄8 397 141⁄4 362 71⁄2 191 77⁄8 200 5 127 55⁄16 1353⁄4 193⁄4 191⁄2 13 200 91

⁄2 902 295⁄16 745 17 432 173⁄4 451 133⁄4 349 141⁄2 368 1 25 11⁄4 32 1 25 1720 780

⁄2 1029 32 813 191⁄2 495 201⁄4 514 147⁄8 378 155⁄8 397 1 25 11⁄2 38 1 25 2600 1179

Center

⁄16 468 10 254 101⁄2 267 6 152 61⁄2 1653⁄4 193⁄4 193⁄4 19 340 154

Angle

Angle 150# Angle 300# Angle

Thread

Angle 150# Angle 300# Port Size Port Size Port Size Shipping

Thread

Weights*

*Estimated in lbs.

Operating Pressure

Threaded = 400psi (27.6 bar)

and Coated

EPDM (optional)

Viton

(optional)

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-M1518 — Full Port Ductile Iron Dual Chamber Basic Valve with Mechanical Check Feature

Flow Data - ACV M518 (Globe) / M1518 (Angle)

Valve Size - Inches 2 2-1/2 3 4 6 8 10 12 14 16

Maximum Continuous

Flow Rate Gpm (Water)

Maximum Intermittent

Flow Rate Gpm (Water)

CV Factor GPM (Globe) 45 75 100 175 490 770 1200 1750 2125 2890

CV Factor GPM (Angle) 57 91 125 215 571 990 1530 2525 2885 3575

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)

210 300 485 800 1850 3100 5000 7000 8500 11100

265 390 590 1000 2300 4000 6250 8900 10800 14100

Estimated

Headloss

100

Pressure Drop (psi)

Angle

2-1/2

Globe

2-1/2

2 4 6 8 10 20 40 60 80 100 200 500 1000 2000 5000 10000 20000

Flow Rate - Gallons per minute (Water)

Valve Cover Chamber Capacity

Valve Size - Inches 2 2-1/2 3 4 6 8 10 12 14 16

fluid oz. 4 10 10 22 70

U.S. Gal 1-1/4 2-1/2 4 6-1/2 9-1/2

Valve Travel

Valve Size - Inches 2 2-1/2 3 4 6 8 10 12 14 16

Travel - Inches 1/2 5/8 3/4 1 1-1/2 2 2-1/2 3 3-1/2 4

A Watts Water Technologies Company

USA: Tel. (713) 943-0688 • (713) 944-9445 • www.watts.com