Watts M1115-7 User Manual

Mu s t a n g se r i e s

1

X X

X X

Y/FC

P/L

4

2

CLOSES VALVE

OPENS VALVE

FLOW

3

(AOS)

1

X X

X X

Y/FC

P/L

4

2

CLOSES VALVE

OPENS VALVE

FLOW

3

(AOS)

Schematic

Throttles to reduce high upstream pressure to •
constant lower downstream pressure
Closes quickly when downstream pressure •
exceeds reduced pressure setpoint

PRESSURE REDUCING VALVE

w i t h SURGE CONTROL FEATURE

06/08

M115-7 (Globe)

M1115-7 (Angle)

Ideal for use when high capacity on-off equipment is •
installed downstream
Reducing and Surge Control setpoints are separately •
adjustable

Standard Components

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

4 – Fixed Orice

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)

(3)

(1)

Standard 3” & Smaller

(2)

Standard 4” & Larger

(3)

Optional All Sizes

(2)

(3)

(1)

Operations

The Watts ACV Combination Pressure Reducing and Surge Control Valve is designed to automatically reduce a

uctuating higher upstream pressure to a constant lower downstream pressure, and will quickly modulate toward

a closed position if downstream pressure suddenly becomes greater than the desired regulated setpoint. The
quick closing action prevents possible damaging high inlet pressure from passing through the valve to downstream

piping. Normal regulating action 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.

If downstream pressure suddenly becomes greater than the desired regulated setpoint, the normally closed
surge control pilot opens and rapidly admits higher inlet pressure into the valve cover, increasing rate of valve

closure. Normal pressure reducing operation resumes when downstream pressure decreases below the desired
regulated setpoint.

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

Mu s t a n g se r i e s

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K

K

D

K

A

B

C

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G

H

I J

M115-7 (Globe)

M1115-7 (Angle)

Materials

Globe

Angle

Body & Cover: Ductile Iron ASTM A536

Coating: NSF Listed Fusion Bonded

Epoxy Lined and Coated

Trim: 316 Stainless Steel

Elastomers: Buna-N (standard)

EPDM

Viton

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)

30-300 psi (Standard) Stainless Steel (Optional)

0-30 psi (Optional)

Surge Control

20-200 psi (Standard)

0-30 psi (Optional)

Dimensions

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

VALVE

GLOBE

SIZE

1-1/4 7-1/4 - - 5-1/2 3-1/4 - - 1-7/8 - - 3/8 1/4 20

1-1/2 7-1/4 8-1/2 9 5-1/2 3-1/4 4 4-1/4 1-7/8 4 4-1/4 3/8 1/4 25

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

THRD.

2 9-3/8 9-3/8 10 6-1/2 4-3/4 4-3/4 5 3-1/4 3-1/4 3-1/2 3/8 1/2 40

3 12-1/2 12 13-1/4 8-1/4 6-1/4 6 6-3/8 4-1/2 4 4-3/8 1/2 1/2 95

4 - 15 15-5/8 10-5/8 - 7-1/2 7-7/8 - 5 5-5/16 3/4 3/4 190

6 - 20 21 13-3/8 - 10 10-1/2 - 6 6-1/2 3/4 3/4 320

8 - 25-3/8 26-3/8 16 - 12-3/4 13-1/4 - 8 8-1/2 1 1 650

10 - 29-3/4 31-1/8 17-1/8 - 14-7/8 15-9/16 - 8-5/8 9-5/16 1 1 940

GLOBE

150#

GLOBE

300#

COVER TO

CENTER

ANGLE

THRD.

ANGLE

150#

ANGLE

300#

ANGLE

THRD.

ANGLE

150#

ANGLE

300#

PORT

For larger sizes consult factory

SIZE

PORT

SIZE

SHIPPING

WEIGHTS*

Valve Cover Chamber Capacity

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

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

.oz. 4 4 4 10 10 22 70

- -

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

CAVITATION ZONE

INLET PRESSURE - PSI

OUTLET PRESSURE - PSI

300

280

260

240

220

200

180

160

140

120

100

80

60

40

20

0 10 20 40 50 60 70 80 90

130 14012011 0100

30

CAVITATION CHART

M115-7 (Globe)

Mu s t a n g se r i e s

Sizing

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

Maximum Continuous (GPM) 95 130 210 300 485 800 1850 3100 5000

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

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

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.

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.

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.

M1115-7 (Angle)

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

Mu s t a n g se r i e s

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3

4

5

6

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8

9

10

1

11

12

13

14

15

16

17

Cross-Sectional Detail

Main Valve

M115-7 (Globe)

M1115-7 (Angle)

ITEM DESCRIPTION MATERIAL

1 Cover ASTM A536 65-45-12 Epoxy Coated Ductile Iron

2 Cover Bearing ASTM A276 304 Stainless Steel

3 Shaft / Stem ASTM A276 304 Stainless Steel

4 Stud ASTM A570 Gr.33 Zinc Plated Steel

5 Cover Nut ASTM A570 Gr.33 Zinc Plated Steel

6 Diaphragm* Buna-N (Nitrile)

7 Body ASTM A536 65-45-12 Epoxy Coated Ductile Iron

8 Seat Disc* Buna-N (Nitrile)

9 Seat Ring ASTM A743 CF8M (316) Stainless Steel

10 Spring ASTM A276 302 Stainless Steel

11 Stem Nut ASTM A276 304 Stainless Steel

12 Spring Washer ASTM A276 304 Stainless Steel

13 Diaphragm Washer ASTM A536 65-45-12 Epoxy Coated Ductile Iron

14 Disc Retainer ASTM A536 65-45-12 Epoxy Coated Ductile Iron

15 Spacer Washer* Fiber*

16 Disc Guide ASTM A743 CF8M (316) Stainless Steel

17 Seat Gasket* Buna-N (Nitrile)

* Contained in Main Valve Repair Kit

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

Mu s t a n g se r i e s

Controls and Accessories

Model CP-15

Pressure Reducing Pilot

M115-7 (Globe)

M1115-7 (Angle)

1

2

3

4

5

6

7

8

10

11

12

13

14

15

16

Front View Side View

ITEM

NUMBER

1 Adjusting Screw

2 Jam Nut

3 Spring Housing

4 Spring

5 Cap Screw

6 Body

7 Seat

8 O-Ring*

9 Bottom Cap

10 Spring Guide

DESCRIPTION

9

ITEM

NUMBER

11 Nut

12 Belleville Washer

13 Diaphragm Washer

14 Diaphragm *

15 Yoke

16 Disc and Retainer Assembly*

DESCRIPTION

* Included in Repair Kit

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

Mu s t a n g se r i e s

Controls and Accessories

Model CP-16

Downstream Surge Control

M115-7 (Globe)

M1115-7 (Angle)

1

11

2

12

13

3

4

5

14

16

15

17

ITEM

NUMBER

1 Adjusting Screw

2 Jam Nut

3 Spring Housing

4 Spring

5 Cap Screw

6 Shaft O-Ring*

7 Power Chamber

8 O-Ring *

9 Body

10 Seat

11 Spring Guide

DESCRIPTION

6

7

8

9

10

18

19

21

ITEM

NUMBER

12 Upper Stem Nut

13 Belleville Washer

14 Upper Diaphragm Washer

15 Diaphragm *

16 Lower Diaphragm Washer

17 O-Ring *

18 Stem

19 O-Ring *

20 Disc and Retainer Assembly *

21 Lower Stem Nut

DESCRIPTION

* Included in Repair Kit

20

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

M115-7 (Globe)

Mu s t a n g se r i e s

Installations

Prior to installation, ush line to remove debris.•
Install valve horizontally “in line” (cover facing UP), so ow arrow matches ow through the line. • Avoid install-

ing valves 6” and larger vertically. Consult factory prior to ordering if installation is other than described.
Install inlet and outlet isolation valves. • NOTE: When using buttery valves, insure disc does not contact con-
trol valve. Damage or improper valve seating may occur.
Provide adequate clearance for valve servicing and maintenance.•
Install pressure gauges to monitor valve inlet and outlet pressure.•

If installation is subjected to very low ow or potentially static conditions, it is recommended a pressure relief •

valve (1/2” minimum) be installed downstream of the Pressure Reducing Valve for additional system protec­tion.

Start-Up

Proper Automatic Control Valve start-up requires bringing the valve into service in a controlled manner. All

adjustments to control pilots and speed controls, if so equipped, should be made slowly, allowing the valve to

respond and the system to stabilize. NOTE: Control Valves should be set‑up in a dynamic (owing) condition
for proper start‑up. Provisions for ow must be made to insure proper settings.

For proper operation, the Surge Control Pilot is adjusted approximately 10 PSI • higher than the Pressure
Reducing Control.

M1115-7 (Angle)

Close upstream and downstream valves to isolate the valve from line pressure. Release spring tension 1.

on Pressure Reducing Control by turning adjustment screw out (counterclockwise), decreasing setpoint.

Increase spring tension on Surge Control Pilot by turning adjustment screw in (clockwise) to keep Surge

Control Pilot closed while downstream pressure adjustments are made. Open all Isolation Ball Valves, if
so equipped. If valve is tted with adjustable speed controls, turn needle(s) in (clockwise) until seated,
and return out (counterclockwise) 1-1/2 to 2-1/2 turns. These are approximate settings, and should be
ne tuned to suit system requirements after pressure adjustments have been made.

Slowly open upstream isolation valve to allow controlled lling of the valve. Vent entrapped air by carefully 2.

loosening control tubing or pipe plug at the highest point possible. If valve is equipped with a Position

Indicator, open Air Bleed Petcock to vent air. Water will be milky in appearance and will begin to clear as

air is vented. Carefully loosen enough cover screws on control pilot(s) to vent entrapped air. Re-tighten
when water vents clearly.

Setting Reducing Control:3. Slowly open downstream isolation valve. Gradually turn adjustment screw on
the Pressure Reducing Control in (clockwise) to raise downstream pressure. Allow valve and system to

stabilize. Observe inlet and outlet pressure gauges. Continue to adjust as needed, pausing approximately
every 1-1/2 turns, allowing valve and system to stabilize. Turning adjustment screw clockwise raises

outlet pressure. Turning adjustment screw counterclockwise lowers outlet pressure. Continue to adjust
until downstream pressure is approximately 10 PSI higher than desired outlet pressure.

Setting Surge Control:4. While observing downstream pressure gauge (or Position Indicator), slowly

turn Surge Control Pilot adjustment screw out (counterclockwise) until downstream pressure quickly
falls. The Surge Control Pilot is set at the point when the valve begins to close. Tighten locknut on the
Surge Control Pilot. Turn adjustment screw counterclockwise on Pressure Reducing Control until desired
downstream pressure is achieved. Tighten locknut on Pressure Reducing Pilot. The Surge Control Pilot
is set approximately 10 PSI higher than the Pressure Reducing Control.

Fine tune Speed Controls to suit system requirements. Adjust Closing Speed Control (if equipped) 5.

clockwise for slower closure, and counterclockwise for faster closure. Adjust Opening Speed Control (if
equipped) clockwise for slower opening, and counterclockwise for faster opening.

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

M115-7 (Globe)

Mu s t a n g se r i e s

Specications

The Pressure Reducing and Downstream Surge Control Valve shall be a pilot operated diaphragm valve

designed to automatically reduce a uctuating higher upstream pressure to a constant lower downstream
pressure regardless of varying ow rate, and quickly modulate toward a closed position when a sudden high

pressure downstream condition occurs.

The main valve shall be a hydraulically operated, single diaphragm actuated, globe or angle pattern valve.

Y-pattern valves shall not be permitted. The valve shall contain a disc and diaphragm assembly that forms

a sealed chamber below the valve cover, separating operating pressure from line pressure. The diaphragm
shall be constructed of nylon reinforced Buna-N, and shall not seal directly against the valve seat and shall

be fully supported by the valve body and cover. Rolling diaphragm construction will not be allowed and there
shall be no pistons operating the main valve or any pilot controls.

The main valve body and cover shall be Ductile Iron ASTM A536, and all internal cast components shall
be Ductile Iron or CF8M (316) Stainless Steel. All Ductile Iron components, including the body and cover,
shall be lined and coated with an NSF 61 Certied Epoxy Coating applied by the electrostatic heat fusion
process. All main valve trim and throttling components (cover bearing, valve seat and disc guide) shall

be Stainless Steel. The valve body and cover must be machined with a 360-degree locating lip to assure
proper alignment.

M1115-7 (Angle)

The disc and diaphragm assembly shall contain a Buna-N synthetic rubber disc with a rectangular cross­section that is securely retained on 3-1/2 sides by a disc retainer and disc guide. Diaphragm assemblies
utilizing bolts or cap screws for component retention will not be permitted.

The exposed portion of the seat disc shall contact the valve seat and seal drip-tight. The disc and diaphragm

assembly must be guided by two separate bearings, one installed in the valve cover and one concentrically
located within the valve seat, to avoid deection and assure positive disc-to-seat contact. Center guided

valves will not be permitted. All necessary repairs shall be made from the top of the valve while the body
remains in line.

Pilot control systems for valves 3” and smaller shall contain a Flow Clean Strainer, Fixed Orice Closing
Speed, Adjustable Opening Speed Control, Downstream Surge Control Pilot and Pressure Reducing Pilot.
Pilot control systems for valves 4” and larger shall contain an external Y-Strainer, Fixed Orice Closing
Speed, Downstream Surge Control Pilot, Pressure Reducing Pilot and Isolation Ball Valves on all body
connections. All pilot control systems shall utilize copper tubing and brass ttings regardless of valve size.

The adjustment range of the surge control pilot shall be 20-200 psi and the pressure reducing pilot shall be
30-300 psi.

The valve shall be Watts ACV Model M115-7 (Globe) or M1115-7 (Angle) pattern Combination Pressure
Reducing and Surge Control Valve.

Other Watts ACV Pressure Reducing Control Valves

M115 / M1115 Pressure Reducing Valve
M115-3 / M1115-3 Pressure Reducing Valve with Hydraulic Check Feature
M115-74 / M1115-74 Pressure Reducing Valve with Low Flow By-Pass

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