Watts S1127-31 User Manual
R
TWO-WAY FLOW ALTITUDE VALVE
with SOLENOID OVERRIDE
FEATURE
01/05
Stainless Series
Specifications
The Two Way Flow Altitude Valve with Solenoid Override Feature shall be a pilot operated diaphragm valve
designed to open, allowing flow into a reservoir or elevated storage tank (tank fill), and close drip tight when
high water level is achieved. The valve shall also open allowing return flow (tank discharge), when upstream
pressure falls below reservoir head pressure. It shall control water level by remotely sensing static tank
head pressure, and open when the level is below the adjustable setpoint and close drip tight when the level
is above the adjustable setpoint or as commanded by the Solenoid Pilot. The Solenoid shall have provisions
for manual operation in the event of power outage. Solenoid voltage shall be _________ and enclosure
shall be NEMA 4 General Purpose. The main valve shall close when the solenoid is energized.
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.
S127-31 or S6127-31 (Globe)
S1127-31 or S61127-31 (Angle)
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.
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 Altitude Pilot, 3-Way Accelerator Pilot, 3-Way Solenoid Pilot with
screw type Manual Operator, (1) Check Valve, separate Adjustable Opening and Closing Speed Controls,
Visual Position indicator with air bleed petcock, 3-Way Ball Valve, external Y-Strainer and Isolation Ball
Valves on all body connections. The pilot control system shall utilize copper tubing and brass fittings.
The valve shall be Watts ACV Model S127-31 / S6127-31 (Globe) or S1127-31 / S61127-31 (Angle) Two
Way Flow Altitude Control Valve with Solenoid Override Feature.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
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