Watts F1116 User Manual
R
PRESSURE RELIEF, SUSTAINING,
or BACKPRESSURE CONTROL VALVE
01/05
F116 (Globe)
Classic Series
Specifications
The Pressure Relief, Sustaining or Backpressure Control Valve shall be a pilot operated diaphragm valve
designed to permit flow when upstream pressure is above the adjustable setpoint of the control pilot, and
throttle toward closed when upstream pressure falls below the adjustable setpoint.
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.
F1116 (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 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, Adjustable Closing Speed
and Pressure Relief / Sustaining Pilot. Pilot control systems for valves 4” and larger shall contain an external
Y-Strainer, Adjustable Closing Speed, Pressure Relief / Sustaining 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 relief / sustaining pilot shall be 20-200 psi.
The valve shall be Watts ACV Model F116 (globe) or F1116 (angle) pattern Pressure Relief / Sustaining or
Backpressure Control Valve.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
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