Manual

Mustang Series



C
F G
D
E
A
B
H
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 & Stainless Steel
Spring:
R
01/05
M6518 (Globe)
M61518 (Angle)
Globe
Angle
Description
The Watts ACV Models M6518 and M61518 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.
Model M6518: Globe Pattern Dual Chamber Basic Valve with Mechanical Check Feature
Model M61518: Angle Pattern Dual Chamber Basic Valve with Mechanical Check Feature
Operating Pressure
Threaded = 400 psi / 150 Flanged = 250 psi / 300 Flanged = 400 psi
Operating Temperature
Buna-N: 160°F Maximum
EPDM: 300°F Maximum
Viton: 250°F Maximum
Description
Operating Pressure
Operating Temperature
Dimensions
A B C D E F G H I J
VALVE
SIZE
GLOBE
150#
GLOBE
300#
COVER TO
CENTER
ANGLE
150#
ANGLE
300#
ANGLE
150#
ANGLE
300#
PORT
SIZE
PORT
SIZE
PORT
SIZE
SHIPPING
3 10-1/4 11 9-1/16 3/8 1/2 1/4 31
4 13-7/8 14-1/2 11-11/16 6-15/16 7-1/4 5-1/2 5-13/16 1/2 1/2 1/2 50
6 17-3/4 18-5/8 15-1/4 8-7/8 9-3/8 6-3/4 7-1/4 3/4 3/4 1/2 130
8 21-3/8 22-3/8 20-1/8 10-11/16 11-3/16 7-1/4 7-3/4 3/4 3/4 3/4 210
10 26 27-3/8 23-11/16 1 1 1 363
12 30 31-1/2 26-1/4 1 1 1 528
16 35 36-5/8 34-1/8 1 1-1/4 1 826
18 48 49-5/8 41 1 2 1 1365
20 48 49-5/8 41 1 2 1 1390
M6518 link
Standard Materials
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com