Watts S1114-3 User Manual

R

RATE-OF-FLOW VALVE with
HYDRAULIC CHECK FEATURE

01/05

Stainless Series

S1114-3 or S61114-3 (Angle)

Operation

The Watts ACV Rate-of-Flow Control Valve is designed to automatically limit flow rate to a constant,
adjustable, maximum, and close drip-tight when downstream pressure becomes greater than upstream
pressure. It 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.

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 flow control operation
resumes when upstream pressure exceeds downstream pressure.

The Orifice Plate Assembly should be installed three to five pipe diameters downstream of the Rate­of-Flow Valve, and field connected with 3/8” minimum copper tubing in accordance with factory
piping schematic. Please specify desired flow rate prior to ordering.

S114-3 or S6114-3 (Globe)

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 Rate-of-Flow Valve

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 Watts ACV Rate-of-Flow Control Valves

S114 / S6114 Rate-of-Flow Control Valve
S114-1 / S6114-1 Rate-of-Flow Control Valve with Solenoid (On-Off) Feature
S114-2 / S6114-2 Rate-of-Flow Control Valve with Pressure Reducing Feature
S114-8 / S6114-8 Rate-of-Flow Control Valve with Pressure Sustaining Feature

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