User Manual

01/06

910 Series

Model

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.amesﬁrewater.com

PRESSURE REDUCING and

SUSTAINING VALVE with

HYDRAULIC CHECK FEATURE

912-01

612-01

912-01 link

Operation

The AMES Model 912-01 / 612-01 Combination Pressure Reducing and Sustaining Control Valve with

Hydraulic Check Feature is designed to automatically reduce a ﬂuctuating higher upstream pressure to a

constant lower downstream pressure regardless of varying ﬂow 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 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 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, ﬂuid 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.

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 backpressure or

sustaining operation resumes when upstream pressure exceeds downstream pressure.

PAGE 1
PRESSURE REDUCING and SUSTAINING VALVE with HYDRAULIC CHECK FEATURE 01/06 910 Series Model 912-01 612-01 Operation The AMES Model 912-01 / 612-01 Combination Pressure Reducing and Sustaining Control Valve with Hydraulic Check Feature is designed to automatically reduce a ﬂuctuating higher upstream pressure to a constant lower downstream pressure regardless of varying ﬂow rates, and will throttle to sustain a minimum upstream pressure.
PAGE 2
PRESSURE REDUCING and SUSTAINING VALVE with HYDRAULIC CHECK FEATURE 01/06 910 Series Model 912-01 612-01 Installation Guidelines • • • • • • Prior to installation, ﬂush line to remove debris. Install valve horizontally “in line” (cover facing up), so ﬂow arrow matches ﬂow through the line. Avoid installing valves 6” and larger vertically. Consult factory prior to ordering if installation is other than described. Install inlet and outlet isolation valves.