Watts S1115 User Manual

R

PRESSURE REDUCING VALVE

01/05

Stainless Series

S1115 or S61115 (Angle)

Operation

S115 or S6115 (Globe)

The Watts ACV Pressure Reducing Control Valve is designed to automatically reduce a fluctuating higher
upstream pressure to a constant lower downstream pressure regardless of varying flow rates. 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.

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. 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.

• If installation is subjected to very low flow or potentially static conditions, it is recommended a pressure

relief valve (1/2” minimum) be installed downstream of the Pressure Reducing Valve for additional system
protection.

Other Watts ACV Pressure Reducing Control Valves

S115-2 / S6115-2 Pressure Reducing and Sustaining Valve
S115-3 / S6115-3 Pressure Reducing Valve with Hydraulic Check Feature
S115-4 / S6115-4 Pressure Reducing Valve with Solenoid (On-Off) Feature
S115-7 / S6115-7 Pressure Reducing Valve with Downstream Surge Control Feature
S115-11 / S6115-11 Pressure Reducing and Sustaining Valve with Hydraulic Check Feature
S115-43 / S1115-43 Pressure Reducing and Sustaining Valve with Surge Control Feature
S115-58 / S6115-58 Pressure Reducing Valve with Return Flow Feature
S115-74 / S6115-74 Pressure Reducing Valve with Low Flow By-Pass

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