Watts F1115-2 User Manual

PRESSURE REDUCING VALVE with PRESSURE SUSTAINING FEATURE

01/05

Classic Series

F115-2 (Globe)

F1115-2 (Angle)

Speciﬁcations

The Pressure Reducing and Sustaining Control Valve 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, and sustain a minimum upstream pressure.

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, Pressure Sustaining Pilot and Pressure Reducing Pilot. Pilot control systems for valves 4” and larger shall contain an external Y-Strainer, Fixed Oriﬁce Closing Speed, Pressure Sustaining Pilot, Pressure Reducing Pilot and Isolation Ball Valves on all body connections. All pilot control systems shall utilize copper tubing and brass ﬁttings regardless of valve size. The adjustment range of the pressure sustaining pilot shall be 20-200 psi and the pressure reducing pilot shall be 30-300 psi.

The valve shall be Watts ACV Model F115-2 (globe) or F1115-2 (angle) pattern Pressure Reducing and Sustaining Control Valve.

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com