Watts M1115 - Manual

12541 Gulf Freeway • Houston, Texas 77034 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
○ X – Isolation Cocks
○ FC – Flo-Clean Strainer
○ Y – Y-Strainer (Replaces Flo-Clean)
○ ACS – Adjustable Closing Speed
(Replaces Fixed Orifice)
○ AOS – Adjustable Opening Speed
○ P – Position Indicator
○ L – Limit Switch
02/09
M
ustang
s
eries
Standard Components
Options & Accessories
(3)
(3)
(3)
(2)
(2)
(1)
(1)
Standard 3” & Smaller
Standard 4” & Larger
Optional All Sizes (3)
(2)
(1)
Schematic
910 link
• Throttles to reduce high upstream pressure to
constant lower downstream pressure
1
X
X X
Y/FC
P/L
3
2
CLOSES VALVE
OPENS VALVE
FLOW
(AOS)
M115 (Globe)
M1115 (Angle)
PRESSURE REDUCING
CONTROL VALVE
The Watts ACV Pressure Reducing Control Valve is designed to automatically reduce a fluctuating higher
upstream pressure to a constant lower downstream pressure regardless of varying flow rates. It is con-
trolled by a normally open, pressure reducing pilot designed to: 1) Open (allowing fluid out of the main valve
cover chamber) when downstream pressure is below the adjustable setpoint, and 2) Close (allowing fluid to
fill 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.
Operations
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Fixed Orifice
• Reducing setpoint is adjustable