Watts LFF1115 User Manual
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.
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
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
3
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