Watts LFF1115 - Manual (Page 7)

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Specifications
LFF115 (Globe)
LFF1115 (Angle)
The Lead Free* Pressure Reducing Control Valve shall be a pilot operated diaphragm valve designed to
automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure re-
gardless of varying flow rates.
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 re-
tained 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 dia-
phragm assembly must be guided by two separate bearings, one installed in the valve cover and one con-
centrically 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 and Pressure Reducing Pilot. Pilot control systems for valves 4"
and larger shall contain an external Y-Strainer, Fixed Orifice Closing Speed, 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 reducing pilot shall be 30-300 psi.
The valve shall be Watts ACV Model LFF115 or (Globe) or LFF1115 (Angle) pattern Pressure Reducing
Control Valve.
Other Watts ACV Pressure Reducing Control Valves
LFF115-3 / LFF1115-3 Pressure Reducing Valve with Hydraulic Check Feature
LFF115-7 / LFF1115-7 Pressure Reducing Valve with Downstream Surge Control Feature
LFF115-74 / LFF1115-74 Pressure Reducing Valve with Low Flow By-Pass
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.