Watts M1115-3 - Manual

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 ○
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
06/08
M
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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 X
Y/FC
P/L
2
CLOSES VALVE
OPENS VALVE
FLOW
3
4
3
(AOS)
M115-3 (Globe)
M1115-3 (Angle)
Operations
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Check Valve
4 – Fixed Orifice
Hydraulic Check Feature prevents flow reversal •
Reducing set-point is adjustable •
PRESSURE REDUCING VALVE
with
HYDRAULIC CHECK FEATURE
The Watts ACV Combination Pressure Reducing and Check Valve is designed to automatically reduce a
fluctuating higher upstream pressure to a constant lower downstream pressure, and close drip-tight when
downstream pressure becomes greater than upstream pressure.
It is controlled 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 (al-
lowing fluid to fill the main valve cover chamber) when downstream pressure is above the adjustable set-
point. 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.
If downstream pressure becomes greater than upstream pressure, downstream pressure is admitted to the
main valve cover chamber, closing the valve and preventing reversal of flow. Normal pressure reducing
operation resumes when upstream pressure exceeds downstream pressure.