User 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 Orice)
○ AOS – Adjustable Opening Speed
○ P – Position Indicator
○ L – Limit Switch
05/09
Mustang series
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
1
X
X
X
Y/FC
P/L
3
4
2
CLOSES VALVE
OPENS VALVE
FLOW
(AOS)
M115-2 (Globe)
M1115-2 (Angle)
Operations
PRESSURE REDUCING CONTROL VALVE
WITH PRESSURE SUSTAINING FEATURE
• Throttles to reduce high upstream pressure to constant
lower downstream pressure
• Throttles to maintain minimum upstream pressure
• Reducing and Sustaining setpoints are separately
adjustable
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Pressure Sustaining Control
4 – Fixed Orice
The Combination Pressure Reducing and Pressure Sustaining Control Valve is designed to automatically
reduce a uctuating higher upstream pressure to a constant lower downstream pressure regardless of
varying ow rates, and will throttle to sustain a minimum upstream pressure. 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 normally closed sustaining pilot remains open when upstream pressure is above the adjustable setpoint,
and modulates toward a closed position if upstream pressure falls below the setpoint. As the sustaining pilot
closes, uid is directed into the main valve cover chamber, allowing the valve to modulate toward a closed
position, raising upstream pressure. Normal pressure reducing operation resumes when upstream pressure
is above the sustaining pilot setpoint, and downstream pressure is below the reducing pilot setpoint.