Watts M1115 User Manual
Page 6
Size (in)
1-1/4
1-1/2
2
2-1/2
3
4
6
8
10
12
14
16
Maximum Continuous
(GPM)
95
130
210
300
485
800
1850
3100
5000
7000
8400
11100
Maximum Intermittent
(GPM)
119
161
265
390
590
1000
2300
4000
6250
8725
10500 13300
Minimum Continuous
(GPM)
1
1
1
20
30
50
115
200
300
400
500
650
12541 Gulf Freeway
•
Houston, Texas 77034
•
(Ph) 713.943.0688
•
(Fx) 713.944.9445
•
www.watts.com
M
ustang
s
eries
M115 (Globe)
M1115 (Angle)
• 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.
Proper Automatic Control Valve startup requires bringing the valve into service in a controlled manner. All
adjustments to control pilots and speed controls 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.
1. Close upstream and downstream valves to isolate the valve from line pressure. Release spring
tension on Pressure Reducing Control by turning adjustment screw out (counterclockwise),
decreasing setpoint. 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) 11/2 to
21/2 turns. These are approximate settings, and should be fine tuned to suit system requirements
after pressure adjustments have been made.
2. Slowly open upstream isolation valve to allow controlled filling of the valve. Vent entrapped air by
carefully 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. Retighten when water vents clearly.
3. Setting Reducing Control: 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 11/2 turns, allowing valve and system to stabilize. Turning adjustment
screw clockwise raises outlet pressure. Turning adjustment screw counterclockwise lowers outlet
pressure. When desired downstream pressure is reached, tighten locknut on adjustment screw.
4. Fine tune Speed Controls to suit system requirements. Adjust Closing Speed Control (if equipped)
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
910 Ops & Inst