Watts F1115-74 - Manual (Page 7)

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Specifications
F115-74 (Globe)
F1115-74 (Angle)
The Pressure Reducing Control Valve with Low Flow By-Pass shall be a pilot operated diaphragm valve
designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream
pressure regardless of varying flow rates. Flow requirements below the normal range of the main line Pressure
Reducing Control Valve shall be handled by a valve mounted, direct acting, Low Flow By-Pass valve.
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.
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 Certified 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 deflection 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 Orifice Closing Speed,
Adjustable Opening Speed Control, Low Flow By-Pass and Pressure Reducing Pilot. Pilot control systems for
valves 4” and larger shall contain an external Y-Strainer, Fixed Orifice Closing Speed, Low Flow By-Pass and
Pressure Reducing Pilot. All pilot control systems shall utilize copper tubing and brass fittings and must be
equipped with Isolation Ball Valves on all body connections regardless of valve size. The adjustment range of
the Low Flow By-Pass shall be 20-200 psi and the pressure-reducing pilot shall be 30-300 psi.
The valve shall be Watts ACV Model F115-74 (Globe) or F1115-74 (Angle) pattern Pressure Reducing Control
Valve with Low Flow By-Pass.
F115 / F1115 Pressure Reducing Valve
F115-3 / F1115-3 Pressure Reducing Valve with Hydraulic Check Feature
F115-7 / F1115-7 Pressure Reducing Valve with Surge Control Feature
Other Watts ACV Pressure Reducing Control Valves
910 Ops & Inst