Watts S1110-18 User Manual
R
ON-OFF FLOAT VALVE with
PRESSURE SUSTAINING FEATURE
01/05
Stainless Series
S1110-18 or S61110-18 (Angle)
Specifications
The On-Off Float Control Valve with Pressure Sustaining Feature shall be a pilot operated diaphragm valve
designed to open fully or close drip-tight as commanded by the Float Control Pilot. The Float Pilot may be
either valve or remote mounted. The valve shall close drip tight when water level reaches the adjustable highlevel setpoint, and open when water level is below the adjustable low-level setpoint, allowing a calculated
“draw-down” of water level to increase tank circulation. The valve shall also throttle to sustain a minimum
upstream pressure during tank filling operations.
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 shall be fabricated 304L with Class D zinc plated steel flanges, utilizing stainless
steel seal welds allowing the entire flow path to be stainless steel. External steel components shall be fully
primed and painted with a stainless steel paint to prevent surface corrosion. The valve cover and all internal
components shall be fabricated 304L Stainless Steel, and the main valve trim and throttling components
(cover bearing, valve seat and disc guide) shall be Stainless Steel.
S110-18 or S6110-18 (Globe)
The disc and diaphragm assembly shall contain a Buna-N synthetic rubber disc with a rectangular crosssection 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 seat disc 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.
The pilot control system shall contain an On-Off Float Pilot, 3-Way Accelerator Pilot with integral orifice,
Pressure Sustaining Pilot, separate Adjustable Opening and Closing Speed Controls, (2) 12” Float Rods,
Float Ball, an external Y-Strainer and Isolation Ball Valves on all body connections. The pilot control system
shall utilize copper tubing and brass fittings. The adjustment range of the pressure sustaining pilot shall be
20-200 psi.
The valve shall be Watts ACV Model S110-18 / S6110-18 (Globe) or S1110-18 / S61110-18 (Angle) On-Off
Float Control Valve with Pressure Sustaining Feature.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
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