Watts LFM1115 User Manual

Mustang Series

ES-ACV-SB-LFM115_LFM1115

LEAD FREE

*

LFM115 (Globe) LFM1115 (Angle)

Pressure Reducing Control Valve

Schematic

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

P/L

(AOS)

3

X

• Reducing setpoint is adjustable

2

Standard Components

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

Options & Accessories

Y/FC

FLOW

CLOSES VALVE

OPENS VALVE

XX

1

○ 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 Pressure Reducing Control Valve 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 down-

stream pressure. An increase in downstream pressure causes the valve to modulate toward a closed
position, lowering downstream pressure.

*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.

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.

Mustang series

LFM115 (Globe)

LFM1115 (Angle)

Materials

Body & Cover: Ductile Iron ASTM A536

D

Coating: NSF Listed Fusion Bonded

Globe

K

Angle

L

K

Epoxy Lined and Coated

Trim: 316 Stainless Steel

K

Elastomers: Buna-N (standard)

H

EPDM
Viton

Stem, Nut & Stainless Steel
Spring:

A

B

C

E

F

G

I J

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

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

0-30 psi (Optional)

Copper / Brass (Standard)

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

12 - 34 35-1/2 20-7/8 - 17 17-3/4 - 13-3/4 14-1/2 1 1-1/4 1500

14 - 39 40-1/2 24-1/4 - 19-1/2 20-1/4 - 14-7/8 15-5/8 1 1-1/2 1675

16 - 41-3/8 43-1/2 25 - 20-13/16 21-5/8 - 15-11/16 16-1/2 1 2 3100

GLOBE

150#

GLOBE

300#

COVER TO

CENTER

ANGLE

THRD.

ANGLE

150#

ANGLE

300#

ANGLE

THRD.

ANGLE

150#

ANGLE

300#

PORT

SIZE

PORT

SIZE

SHIPPING

WEIGHTS*

*Estimated in lbs.

Valve Cover Chamber Capacity

Valve Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10 12 14 16

fl.oz. 4 4 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 (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10 12 14 16

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

2

CAVITATION CHART

LFM115 (Globe)

Mustang series

Sizing

Size (in) 1-1/4 1-1/2 2 2-1/2 3 4 6 8 10 12 14 16

Maximum Continuous (GPM) 95 130 210 300 485 800 1850 3100 5000 7000 8500 111 0 0

Maximum Intermittent (GPM) 11 9 161 265 390 590 1000 2300 4000 6250 8900 10800 14100

Minimum Continuous (GPM)

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.

LFM1115 (Angle)

INLET PRESSURE - PSI

300

280

260

240

220

200

180

160

140

120

100

80

60

CAVITATION ZONE

40

20

0 10 20 40 50 60 70 80 90

30

OUTLET PRESSURE - PSI

130 140120110100

3

Mustang series

Cross-Sectional Detail

Main Valve

LFM115 (Globe)

LFM1115 (Angle)

1

2

3

4

5

6

7

10

11

12

13

14

15

16

8

9

17

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

4

Mustang series

Controls and Accessories

Model LFCP-15

Pressure Reducing Pilot

LFM115 (Globe)

LFM1115 (Angle)

1

2

3

4

5

6

7

8

10

11

12

13

14

15

v

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

5

LFM115 (Globe)

Mustang series

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
installing valves 6" and larger vertically. Consult factory prior to ordering if installation is other than

described.

• Install inlet and outlet isolation valves.

NOTICE

When using buttery valves, insure disc does not contact control 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 startup requires bringing the valve into service in a controlled manner. All

adjustments to control pilots and speed controls should be made slowly, allowing the valve to respond and

the system to stabilize.

NOTICE

Control Valves should be set-up in a dynamic (flowing) condition for proper start-up. Provisions for
flow must be made to insure proper settings.

LFM1115 (Angle)

1. Close upstream and downstream valves to isolate the valve from line pressure. Release spring ten­sion on Pressure Reducing Control by turning adjustment screw out (counterclockwise), decreas-

ing setpoint. Open all Isolation Ball Valves, if so equipped. If valve is fitted with adjustable speed

controls, turn needle(s) in (clockwise) until seated, and return out (counterclockwise) 11/2 to 21/2

turns. These are approximate settings, and should be fine tuned to suit system requirements after
pressure adjustments have been made.

2. Slowly open upstream isolation valve to allow controlled filling of the valve. Vent entrapped air by
carefully 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. Retighten when water vents clearly.

3. Setting Reducing Control: 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 11/2 turns, allowing valve and system to stabilize. Turning adjustment
screw clockwise raises outlet pressure. Turning adjustment screw counterclockwise lowers outlet
pressure. When desired downstream pressure is reached, tighten locknut on adjustment screw.

4. Fine tune Speed Controls to suit system requirements. Adjust Closing Speed Control (if equipped)
clockwise for slower closure, and counterclockwise for faster closure. Adjust Opening Speed Control
(if equipped) clockwise for slower opening, and counterclockwise for faster opening.

6

LFM115 (Globe)

Mustang series

Specications

The Lead Free* Pressure Reducing 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 rates.

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.

LFM1115 (Angle)

The disc and diaphragm assembly shall contain a Buna-N synthetic rubber disc with a rectangular cross-

section 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 and Pressure Reducing Pilot. Pilot control systems for valves 4"
and larger shall contain an external Y-Strainer, Fixed Orice Closing Speed, 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 pressure reducing pilot shall be 30-300 psi.

The valve shall be Watts ACV Model LFM115 (Globe) or LFM1115 (Angle) pattern Pressure Reducing Con-

trol Valve.

Other Watts ACV Pressure Reducing Control Valves

LFM115-3 / LFM1115-3 Pressure Reducing Valve with Hydraulic Check Feature
LFM115-7 / LFM1115-7 Pressure Reducing Valve with Downstream Surge Control Feature
LFM115-74 / LFM1115-74 Pressure Reducing Valve with Low Flow By-Pass

*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.

7

A Watts Water Technologies Company

USA: Tel: [phone] • Fax: [phone] • www.watts.com

ES-ACV-SB-LFM115_LFM1115 1410 © 2014 Watts