Watts F1115-74 User Manual

Cl a s s i C se r i e s

(AOS)

P/L

CLOSES VALVE

OPENS VALVE

FLOW

X X

Y/FC

Schematics

Throttles to reduce high upstream pressure to • constant lower downstream pressure

Low Flow By-Pass controls at low ows•

PRESSURE REDUCING CONTROL VALVE

w i t h LOW FLOW BY-PASS FEATURE

06/08

F115-74 (Globe)

F1115-74 (Angle)

Main Line valve controls at high ows•

Reducing and Low Flow By-Pass setpoints are • separately adjustable

Standard Components

1 – Main Valve (Single Chamber) 2 – Pressure Reducing Control

3 – Fixed Orice

4 – Low Flow By-Pass

Options & Accessories

X – Isolation Cocks ○ FC – Flo-Clean Strainer ○ Y – Y-Strainer (Replaces Flo-Clean) ○ ACS – Adjustable Closing Speed ○

(Replaces Fixed Orice)

AOS – Adjustable Opening Speed ○ P – Position Indicator ○ L – Limit Switch ○

(2)

(1)

(3)

(1)

Standard 3” & Smaller

(2)

Standard 4” & Larger

(3)

Optional All Sizes

(2)

(3)

(1)

Operations

The Watts ACV Pressure Reducing Control Valve with Low Flow By-Pass is designed to automatically reduce

a uctuating higher upstream pressure to a constant lower downstream pressure regardless of varying ow rates. It is controlled by a normally open, pressure reducing pilot designed to: 1) Open (allowing uid out of

the main valve cover chamber) when downstream pressure is below the adjustable setpoint, and 2) Close

(allowing uid to ll the main valve cover chamber) when downstream pressure is above the adjustable

setpoint. A decrease in downstream pressure causes the valve to modulate toward an open position, raising downstream pressure. An increase in downstream pressure causes the valve to modulate toward a closed position, lowering downstream pressure.

A Low Flow By-Pass Valve is piped parallel to the Main Pressure Reducing Valve, and is set approximately

10 PSI higher. The Low Flow By-Pass handles ow requirements below the range of the Main Pressure Reducing Valve. During “off peak” demand conditions, the Low Flow By-Pass provides ow and pressure to the downstream zone. As ow requirements increase beyond the capacity of the Low Flow By-Pass, downstream pressure falls below the setpoint of the Main Pressure Reducing Valve allowing it to throttle toward open, supplementing ow and pressure. As ow requirements decrease, downstream pressure rises above the setpoint of the Main Pressure Reducing Valve, causing it to throttle toward closed, allowing the Low Flow By-Pass to resume command of ow and pressure.

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com

Cl a s s i C se r i e s

F115-74 (Globe)

F1115-74 (Angle)

Materials

Globe

Angle

Body & Cover: Ductile Iron ASTM A536

Coating: NSF Listed Fusion

Bonded Epoxy Lined and Coated

Trim: 316 Stainless Steel (1-1/4” – 8”)

ASTM B62 Bronze (10”) (Stainless Steel Optional)

Elastomers: Buna-N (standard)

EPDM (optional)

Viton (optional)

Stem, Nut & Stainless Steel Spring:

Operating Pressure Operating Temperature Pilot System Tubing & Fittings

Threaded = 400 psi

150 Flanged = 250 psi

300 Flanged = 400 psi

Buna-N: 160°F Maximum

EPDM: 300°F Maximum

Viton: 250°F Maximum

Reducing Control Copper / Brass (Standard)

20-175 psi (Standard) Stainless Steel (Optional)

0-30 psi (Optional)

100-300 psi (Optional)

Low-Flow By-Pass

20-200 psi (Standard)

Dimensions

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

VALVE

GLOBE

SIZE

THRD.

1-1/4 7-1/4 - - 3-1/2 3-1/4 - - 1-7/8 - - 1/4 1/2 1/8 15

1-1/2 7-1/4 8-1/2 9 3-1/2 3-1/4 4 - 1-7/8 4 - 1/4 1/2 1/8 15

2 9-3/8 9-3/8 10 4-15/16 4 4 4-1/4 4 4 4-1/4 1/2 1/2 1/4 35

2-1/2 11 11 11-5/8 7 5-1/2 5-1/2 5-13/16 4 4 4-5/16 1/2 1/2 3/8 65

3 10-1/2 12 13-1/4 7 5-1/4 5-3/4 6-1/8 5-1/4 5-3/4 6-1/8 1/2 1/2 3/8 95

4 - 15 15-5/8 8-5/8 - 6-3/4 7-1/8 - 6-3/4 7-1/8 1/2 1/2 3/8 190

6 - 20 21 11-3/4 - 8-1/2 8-7/8 - 8-1/2 8-7/8 1/2 1/2 1/2 320

8 - 25-3/8 26-3/8 15-3/4 - 11 11-1/2 - 11 11-1/2 1/2 1 1/2 650

10 - 29-3/4 31-1/8 18-3/4 - 14-7/8 15-5/8 - 14-7/8 15-5/8 1 1 1 940

GLOBE

150#

GLOBE

300#

COVER TO

CENTER

ANGLE

THRD.

ANGLE

150#

ANGLE

300#

ANGLE

THRD.

ANGLE

150#

ANGLE

300#

PORT

SIZE

PORT

SIZE

PORT

SIZE

SHIPPING

WEIGHTS*

For larger sizes consult factory

Valve Cover Chamber Capac-

Valve Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10

.oz. 4 4 4 10 10 22 70

U.S. Gal - - - - - - -

- -

1-1/4 2-1/2

Valve Travel

Valve Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10

Travel (in) 3/8 3/8 1/2 5/8 3/4 1 1-1/2 2 2-1/2

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com

Cl a s s i C se r i e s

CAVITATION ZONE

INLET PRESSURE - PSI

OUTLET PRESSURE - PSI

300

280

260

240

220

200

180

160

140

120

100

0 10 20 40 50 60 70 80 90

130 14012011 0100

CAVITATION CHART

Pressure Drop

Flow

3/4”

1/2”

15105

Sizing

F115-74 (Globe)

F1115-74 (Angle)

Size (in)

Maximum Continuous (GPM) 100 150 200 300 460 800 1800 3100 4900

Maximum Intermittent (GPM) 119 161 265 390 590 1000 2300 4000 6250

Minimum Continuous (GPM) 1 1 1 20 30 50 115 200 300

NOTE: The above chart is a suggested guide. Inlet pressure, outlet pressure, minumum, normal and maximum ow rates should be considered for specic valve sizing. Contact Watts ACV for details.

1-1/4 1-1/2 2 2-1/2 3 4 6 8 10

Maximum continuous ow based on velocity of 20 ft. per second.

Maximum intermittent ow based on velocity of 25 ft. per second.

Minimum continuous ow based on velocity of 1 ft. per second.

Low-Flow By-Pass

Valve Size (in) By-Pass (in) Adjustment

Range

2-1/2 &

Smaller

3 & Larger 3/4

1/2 20-200 psi

Cavitation Chart

After selecting the valve size, locate

inlet and outlet pressures on this

chart. If the intersection point falls

in the shaded area, cavitation can occur. Operation of valves continually in the cavitation zone should be avoided. Consult Watts ACV for alternatives.

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com

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