Watts F1115-43 User Manual
PRESSURE REDUCING a N D SUSTaINING
VaLVE w I T h SURGE CONTROL FEaTURE
Classic Series
Specications
The Pressure Reducing and Sustaining Control Valve with Downstream Surge Control Feature 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 rates, sustain a minimum upstream
pressure, 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 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.
F1115-43 (Angle)
09/08
F115-43 (Globe)
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.
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, Pressure Sustaining 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 Sustaining 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 pressure sustaining pilot and the
downstream 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 F115-43 (Globe) or F1115-43 (Angle) pattern Pressure Reducing and
Sustaining Control Valve with Downstream Surge Control Feature.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.watts.com
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