Throttles to reduce high upstream pressure to •
constant lower downstream pressure
Closes quickly when downstream pressure •
exceeds reduced pressure setpoint
Ideal for use when high capacity on-off equipment is •
installed downstream
Reducing and Surge Control setpoints are separately •
adjustable
Standard Components
1 – Main Valve (Single Chamber)
2 – Pressure Reducing Control
3 – Downstream Surge Control
4 – Fixed Orice
Options & Accessories
X – Isolation Cocks ○
FC – Flo-Clean Strainer ○
Y – Y-Strainer (Replaces Flo-Clean) ○
ACS – Adjustable Closing Speed ○
(Replaces Fixed Orice)
AOS – Adjustable Opening Speed ○
P – Position Indicator ○
L – Limit Switch ○
(2)
(1)
(3)
(3)
(1)
Standard 3” & Smaller
(2)
Standard 4” & Larger
(3)
Optional All Sizes
(2)
(3)
(1)
Operations
The Watts ACV Combination Pressure Reducing and Surge Control Valve is designed to automatically
reduce a uctuating higher upstream pressure to a constant lower downstream pressure, and will quickly
modulate toward a closed position if downstream pressure suddenly becomes greater than the desired
regulated setpoint. The quick closing action prevents possible damaging high inlet pressure from passing
through the valve to downstream piping. Normal regulating action is controlled by a normally open, pressure
reducing pilot designed to: 1) Open (allowing uid out of the main valve cover chamber) when downstream
pressure is below the adjustable setpoint, and 2) Close (allowing uid to ll 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.
If downstream pressure suddenly becomes greater than the desired regulated setpoint, the normally closed
surge control pilot opens and rapidly admits higher inlet pressure into the valve cover, increasing rate of
valve closure. Normal pressure reducing operation resumes when downstream pressure decreases below
the desired regulated setpoint.
Maximum Continuous (GPM)95130210300485800185031005000
Maximum Intermittent (GPM)1191612653905901000230040006250
Minimum Continuous (GPM)111203050115200300
NOTE: The above chart is a suggested guide. Inlet pressure, outlet pressure, minumum, normal and maximum ow rates should
be considered for specic valve sizing. Contact Watts ACV for details.
1-1/41-1/222-1/2346810
Maximum continuous ow based on velocity of 20 ft. per second.
Maximum intermittent ow based on velocity of 25 ft. per second.
Minimum continuous ow based on velocity of 1 ft. per second.
Cavitation Chart
After selecting the valve size, locate inlet and outlet pressures on this chart. If the intersection point falls
in the shaded area, cavitation can occur. Operation of valves continually in the cavitation zone should be
Prior to installation, ush line to remove debris.•
Install valve horizontally “in line” (cover facing UP), so ow arrow matches ow 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 buttery 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 ow 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.
Start-Up
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 (owing) condition
for proper start‑up. Provisions for ow 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.
F1115-7 (Angle)
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 tted 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
ne tuned to suit system requirements after pressure adjustments have been made.
Slowly open upstream isolation valve to allow controlled lling 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.
The Pressure Reducing and Downstream Surge Control Valve shall be a pilot operated diaphragm valve
designed to automatically reduce a uctuating higher upstream pressure to a constant lower downstream
pressure regardless of varying ow rate, and quickly modulate toward a closed position when a sudden high
pressure downstream condition occurs.
The main valve shall be a hydraulically operated, single diaphragm actuated, globe or angle pattern valve.
Y-pattern valves shall not be permitted. The valve shall contain a disc and diaphragm assembly that forms a
sealed chamber below the valve cover, separating operating pressure from line pressure. The diaphragm shall
be constructed of nylon reinforced Buna-N, and shall not seal directly against the valve seat and shall be fully
supported by the valve body and cover. Rolling diaphragm construction will not be allowed and there shall be
no pistons operating the main valve or any pilot controls.
The main valve shall be a hydraulically operated, single diaphragm actuated, globe or angle pattern valve.
Y-pattern valves shall not be permitted. The valve shall contain a disc and diaphragm assembly that forms a
sealed chamber below the valve cover, separating operating pressure from line pressure. The diaphragm shall
be constructed of nylon reinforced Buna-N, and shall not seal directly against the valve seat and shall be fully
supported by the valve body and cover. Rolling diaphragm construction will not be allowed and there shall be
no pistons operating the main valve or any pilot controls.
F1115-7 (Angle)
The main valve body and cover shall be Ductile Iron ASTM A536, and all internal cast components shall be
Ductile Iron or CF8M (316) Stainless Steel. All Ductile Iron components, including the body and cover, shall
be lined and coated with an NSF 61 Certied Epoxy Coating applied by the electrostatic heat fusion process.
All main valve throttling components (valve seat and disc guide) shall be Stainless Steel. The valve body and
cover must be machined with a 360-degree locating lip to assure proper alignment.
The disc and diaphragm assembly shall contain a Buna-N synthetic rubber “Quad Seal” that is securely
retained on 3-1/2 sides by a disc retainer and disc guide. Diaphragm assemblies utilizing bolts or cap screws
for component retention will not be permitted.
The exposed portion of the Quad Seal shall contact the valve seat and seal drip-tight. The disc and diaphragm
assembly must be guided by two separate bearings, one installed in the valve cover and one concentrically
located within the valve seat, to avoid deection and assure positive disc-to-seat contact. Center guided
valves will not be permitted. All necessary repairs shall be made from the top of the valve while the body
remains in line.
Pilot control systems for valves 3” and smaller shall contain a Flow Clean Strainer, Fixed Orice Closing
Speed, Adjustable Opening Speed Control, Downstream Surge Control Pilot and Pressure Reducing Pilot.
Pilot control systems for valves 4” and larger shall contain an external Y-Strainer, Fixed Orice Closing Speed,
Downstream Surge Control Pilot, Pressure Reducing Pilot and Isolation Ball Valves on all body connections.
All pilot control systems shall utilize copper tubing and brass ttings regardless of valve size. The adjustment
range of the surge control pilot shall be 20-200 psi and the pressure reducing pilot shall be 30-300 psi.
The valve shall be Watts ACV Model F115-7 (Globe) or F1115-7 (Angle) pattern Combination Pressure
Reducing and Surge Control Valve.