Ames Fire & Waterworks 952GS Stainless Steel Rate-of-Flow Control Valve with Pressure Sustaining Feature - Manual

01/06
950 Series Model
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.amesfirewater.com
RATE-OF-FLOW VALVE with
PRESSURE SUSTAINING FEATURE
952
652
Operation
The AMES Model 952 / 652 Rate of Flow Control Valve with Pressure Sustaining Feature is designed to
automatically limit flow rate to a constant, adjustable, maximum, and sustain a minimum upstream pressure.
The flow control action of the valve is controlled by a normally open, differential control pilot designed to: 1)
Open (allowing fluid out of the main valve cover chamber) when the differential pressure across the orifice
plate is below it’s adjustable set point, and, 2) Close (allowing fluid to fill the main valve cover chamber) when
the differential pressure across the orifice plate is above it’s adjustable set point. A decrease in differential
pressure causes the valve to modulate towards an open position, increasing flow rate. An increase in
differential pressure causes the valve to modulate towards a closed position, decreasing flow rate.
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 flow control operation resumes when upstream pressure is
above the sustaining pilot setpoint.
The Orifice Plate Assembly should be installed three to five pipe diameters downstream of the Model
952 / 652, and field connected with 3/8” minimum copper tubing in accordance with factory piping
schematic. Please specify desired flow rate prior to ordering.
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” or large vertically. Consult factory prior to ordering if installation is other than
described.
• Install inlet and outlet isolation valves. NOTE: When using butterfly valves, insure disc does not contact
control valve. Damage or improper valve seating may occur.
• Provide adequate clearance for valve servicing and maintenance.
• Install pressure gauges to monitor valve inlet and outlet pressure.
• Install Orifice Plate Assembly (provided) 3 to 5 pipe diameters downstream of the 950 / 650 with the
sensing connections offset from top of pipeline to avoid air accumulation. The Orifice Plate Assembly
should not be installed next to a butterfly valve.
• Connect Orifice Plate Assembly to Rate-of-Flow Pilot using 3/8” diameter minimum copper tubing (field
installed) in accordance with factory piping schematic.
Other AMES Rate-of-Flow Control Valves
950 / 650 Rate-of-Flow Control Valve
950-01 / 650-01 Rate-of-Flow Control Valve with Hydraulic Check Feature
950-15 / 650-15 Rate-of-Flow Control Valve with Solenoid (On-Off) Feature
951 / 651 Rate-of-Flow Control Valve with Pressure Reducing Feature