Watts 6115-74JM - Manual (Page 2)

TB6115-74JM Rev. A Page 2 of 2
Model 6115-74JM Installation
Prior to installation, flush line to remove debris.
1. Install valve horizontally “in line” (cover facing up), so flow arrow matches flow through the line. Consult
factory prior to ordering if installation is other than described.
2. Install inlet and outlet isolation valves.
Note: When using butterfly valves, ensure disc does not contact control valve. Damage or improper valve
seating can occur.
3. Provide adequate clearance for valve servicing and maintenance.
4. Install pressure gauges to monitor valve inlet and outlet pressure.
Note: If installation is subjected to very low flow or potentially static conditions, it is recommended that a
pressure relief valve (1/2" minimum) be installed downstream of the Pressure Reducing Valve for additional
system protection. See Watts Model PV20-CB.
Start-Up Instructions
Note: Set-up the control valve in a flowing condition for proper start-up. Proper Automatic Control Valve start-up
requires bringing the valve into service in a controlled manner. All adjustments to control pilot and speed
controls, if equipped, should be made slowly, allowing the valve to respond and the system to stabilize. For
proper operation, the Low Flow By-Pass Pilot is set 10 psi higher than the Main Pressure Reducing Valve.
1. Close upstream and downstream isolation valves.
2. Turn the Pilot (item 2) and Low Flow By-Pass (item 8) adjustment screws counterclockwise, releasing the
spring tension. Open all Isolation Ball Valves.
3. Turn Adjustable Opening Speed Control (item 4) clockwise until seated, and then counterclockwise 2-1/2
turns. This is an approximate setting and should be fine tuned to suit system requirements once pressure
adjustments have been made.
4. Slowly open the upstream isolation valve. Loosen air bleed petcock on Position Indicator (item 5) allowing air
to vent. Close the air bleed petcock when all air is vented.
5. Slowly open the downstream isolation valve. Gradually turn the Reducing Pilot adjustment screw clockwise
to raise the downstream pressure.
There must be a demand for flow for proper start-up .
6. Gradually turn the adjustment screw on Reducing Pilot clockwise raising downstream pressure to the
desired setpoint. Allow valve and system to stabilize. Observe inlet and outlet pressure gauges. Continue to
adjust Reducing Pilot as needed, pausing approximately every 1-1/2 turns, allowing valve and system to
stabilize. Turning the adjustment screw clockwise raises the downstream pressure. Turning the adjustment
screw counterclockwise lowers the downstream pressure.
Set Reducing Pilot approximately 10 psi lower
than the desired downstream pressure . Tighten the locknut on the Reducing Pilot.
7. Gradually turn the adjustment screw on Low Flow By-Pass clockwise raising downstream pressure to the
desired setpoint. Allow valve and system to stabilize. Observe inlet and outlet pressure gauges. Continue to
adjust Low Flow By-Pass pausing approximately every 1-1/2 turns to allow the valve and system to
stabilize. Turning the adjustment screw clockwise raises the downstream pressure. Turning the adjustment
screw counterclockwise lowers the downstream pressure. When desired downstream pressure is reached,
tighten the locknut on Low Flow By-Pass.
8. Fine tune Opening Speed Control to suit system requirements. Adjust Opening Speed Control clockwise for
slower opening, and counterclockwise for faster opening.