Watts LFF1115 - Manual

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 with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
LEAD FREE
*
Classic Series
ES-ACV-SB-LFF115_LFF1115
LFF115 (Globe) LFF1115 (Angle)
Pressure Reducing Control Valve
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
Standard Components
(3)
(3)
(3)
(2)
(2)
(1)
(1)
Standard 3" & Smaller
Standard 4" & Larger
Optional All Sizes (3)
(2)
(1)
Schematics
• Throttles to reduce high upstream pressure to
constant lower downstream pressure
P/L
3
2
CLOSES VALVE
OPENS VALVE
FLOW
(AOS)
X
X X
1
Y/FC
(AOS)
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Fixed Orifice
• Reducing setpoint is adjustable
Operations
The Watts ACV Pressure Reducing Control Valve is designed to automatically reduce a fl uctuating higher
upstream pressure to a constant lower downstream pressure regardless of varying fl ow rates. It is con-
trolled by a normally open, pressure reducing pilot designed to: 1) Open (allowing fl uid out of the main valve
cover chamber) when downstream pressure is below the adjustable setpoint, and 2) Close (allowing fl uid to
fi 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 pres-
sure. An increase in downstream pressure causes the valve to modulate toward a closed position, lowering
downstream pressure.
○ X – Isolation Cocks
○ FC – Flo-Clean Strainer
○ Y – Y-Strainer (Replaces Flo-Clean)
○ ACS – Adjustable Closing Speed
(Replaces Fixed Orifi ce)
○ AOS – Adjustable Opening Speed
○ P – Position Indicator
○ L – Limit Switch
Options & Accessories