Page 1
Classic Series
ES-ACV-SB-LFF115_LFF1115
LEAD FREE
*
LFF115 (Globe) LFF1115 (Angle)
Pressure Reducing Control Valve
Schematics
• Throttles to reduce high upstream pressure to
constant lower downstream pressure
P/L
(AOS)
(AOS)
3
X
2
• Reducing setpoint is adjustable
Standard Components
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Fixed Orifice
X X
Y/FC
1
FLOW
CLOSES VALVE
OPENS VALVE
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
(3)
(2)
(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 downstream 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.
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ClassiC series
LFF115 (Globe)
LFF1115 (Angle)
Materials
Body & Cover: Ductile Iron ASTM A536
Coating: NSF Listed Fusion
D
Globe
Angle
L
M
Bonded Epoxy Lined
and Coated
Trim: 316 Stainless Steel
Elastomers: Buna-N (standard)
EPDM (optional)
K
I
H
Viton (optional)
Stem, Nut & Stainless Steel
Spring:
A
B
C
E
F
G
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)
Dimensions
A B C D E F G H I J K L M
VALVE
GLOBE
SIZE
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
2-1/2 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
THRD.
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
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
12 34 35-1/2 20-5/8 17 17-3/4 17 17-3/4 1 1 1 1500
14 39 40-1/2 22-1/4 1 1 1 1675
16 41-3/8 43-1/2 26-1/4 1 1 1 3100
GLOBE
150#
GLOBE
300#
COVER TO
CENTER
ANGLE
THRD.
ANGLE
150#
ANGLE
300#
ANGLE
THRD.
ANGLE
150#
ANGLE
300#
PORT
SIZE
PORT
SIZE
PORT
SHIPPING
SIZE
WEIGHTS*
1
*Estimated in lbs.
J
940
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
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ClassiC series
CAVITATION CHART
Sizing
LFF115 (Globe)
LFF1115 (Angle)
Size (in)
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
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.
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.
INLET PRESSURE - PSI
300
CAVITATION ZONE
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0 10 20 40 50 60 70 80 90
30
OUTLET PRESSURE - PSI
130 140120110100
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Page 4
ClassiC series
Cross-Sectional Detail
Main Valve
LFF115 (Globe)
LFF1115 (Angle)
1
2
10
11
3
12
4
13
5
14
6
7
8
9
15
16
17
ITEM DESCRIPTION MATERIAL
1 Cover ASTM A536 65-45-12 Epoxy Coated Ductile Iron
2 Cover Bearing SAE 841 Bronze
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 Quad Seal* 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 Diaphragm Washer ASTM A536 65-45-12 Epoxy Coated Ductile Iron
13 Spacer ASTM A276 304 Stainless Steel
14
15 O-Ring* Buna-N (Nitrile)
16 Quad Seal Plate ASTM A743 CF8M (316) Stainless Steel
17 Seat Gasket* Buna-N (Nitrile)
4
Quad Seal Retainer
ASTM A536 65-45-12 Epoxy Coated Ductile Iron
* Contained in Main Valve Repair Kit
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ClassiC series
Cross Sectional Detail
Model LF263AP
Pressure Reducing Pilot
LFF115 (Globe)
LFF1115 (Angle)
6
1
7
2
3
Inlet
ITEM
NUMBER
1 Adjusting Screw
2 Jam Nut
3 Spring Housing
4 Cap Screw
5 Body
6 Spring Guide
7 Spring
8 Diaphragm Assembly*
DESCRIPTION
Outlet
4
5
ITEM
NUMBER
9 Stem Assembly*
10 Spring
11 O-Ring*
12 Bottom Cap
8
9
10
11
Gauge
12
DESCRIPTION
*Included in Repair Kit
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Page 6
LFF115 (Globe)
ClassiC 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 buttery 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.
LFF1115 (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), decreasing 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.
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Page 7
LFF115 (Globe)
ClassiC series
Specications
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 Certied Epoxy Coating applied by the electrostatic heat fusion process.
All main valve throttling components (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.
The disc and diaphragm assembly shall contain a Buna-N synthetic rubber “Quad Seal” 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.
LFF1115 (Angle)
The exposed portion of the Quad Seal 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 deection 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 Orice 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 Orice 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 LFF115 or (Globe) or LFF1115 (Angle) pattern Pressure Reducing
Control Valve.
Other Watts ACV Pressure Reducing Control Valves
LFF115-3 / LFF1115-3 Pressure Reducing Valve with Hydraulic Check Feature
LFF115-7 / LFF1115-7 Pressure Reducing Valve with Downstream Surge Control Feature
LFF115-74 / LFF1115-74 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.
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Page 8
A Watts Water Technologies Company
USA: Tel: (713) 943-0688 • Fax: (713) 944-9445 • www.watts.com
ES-ACV-SB-LFF115_LFF1115 1410 © 2014 Watts
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