Watts M1115-7 - Manual (Page 7)

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
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M115-7 (Globe)
M1115-7 (Angle)
Proper Automatic Control Valve start-up requires bringing the valve into service in a controlled manner. All
adjustments to control pilots and speed controls, if so equipped, should be made slowly, allowing the valve to
respond and the system to stabilize. NOTE: Control Valves should be set‑up in a dynamic (flowing) condition
for proper start‑up. Provisions for flow must be made to insure proper settings.
For proper operation, the Surge Control Pilot is adjusted approximately 10 PSI • higher than the Pressure
Reducing Control.
Close upstream and downstream valves to isolate the valve from line pressure. Release spring tension 1.
on Pressure Reducing Control by turning adjustment screw out (counterclockwise), decreasing setpoint.
Increase spring tension on Surge Control Pilot by turning adjustment screw in (clockwise) to keep Surge
Control Pilot closed while downstream pressure adjustments are made. Open all Isolation Ball Valves, if
so equipped. If valve is fitted with adjustable speed controls, turn needle(s) in (clockwise) until seated,
and return out (counterclockwise) 1-1/2 to 2-1/2 turns. These are approximate settings, and should be
fine tuned to suit system requirements after pressure adjustments have been made.
Slowly open upstream isolation valve to allow controlled filling of the valve. Vent entrapped air by carefully 2.
loosening control tubing or pipe plug at the highest point possible. If valve is equipped with a Position
Indicator, open Air Bleed Petcock to vent air. Water will be milky in appearance and will begin to clear as
air is vented. Carefully loosen enough cover screws on control pilot(s) to vent entrapped air. Re-tighten
when water vents clearly.
Setting Reducing Control: 3. Slowly open downstream isolation valve. Gradually turn adjustment screw on
the Pressure Reducing Control in (clockwise) to raise downstream pressure. Allow valve and system to
stabilize. Observe inlet and outlet pressure gauges. Continue to adjust as needed, pausing approximately
every 1-1/2 turns, allowing valve and system to stabilize. Turning adjustment screw clockwise raises
outlet pressure. Turning adjustment screw counterclockwise lowers outlet pressure. Continue to adjust
until downstream pressure is approximately 10 PSI higher than desired outlet pressure.
Setting Surge Control: 4. While observing downstream pressure gauge (or Position Indicator), slowly
turn Surge Control Pilot adjustment screw out (counterclockwise) until downstream pressure quickly
falls. The Surge Control Pilot is set at the point when the valve begins to close. Tighten locknut on the
Surge Control Pilot. Turn adjustment screw counterclockwise on Pressure Reducing Control until desired
downstream pressure is achieved. Tighten locknut on Pressure Reducing Pilot. The Surge Control Pilot
is set approximately 10 PSI higher than the Pressure Reducing Control.
Fine tune Speed Controls to suit system requirements. Adjust Closing Speed Control (if equipped) 5.
clockwise for slower closure, and counterclockwise for faster closure. Adjust Opening Speed Control (if
equipped) clockwise for slower opening, and counterclockwise for faster opening.
Installations
Start-Up
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 install-
ing 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 con-
trol 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 protec-
tion.
910 Ops & Inst