Watts S1127-11 - Manual

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
01/05
R
Stainless Series
ONE-WAY FLOW ALTITUDE VALVE
with DELAYED OPENING FEATURE
S127-11 or S6127-11 (Globe)
S1127-11 or S61127-11 (Angle)
Operation
The Watts ACV One Way Flow Altitude Valve with Delayed Opening Feature is 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 also has an adjustable delayed opening feature, allowing a calculated “draw-down” of water level,
before opening for tank fill operation. The Altitude Pilot remotely senses static tank head pressure (water
level) through a field installed sensing line, and directs pressure into and out of the cover chamber of the 3-
way Accelerator Pilot. When the cover of the Accelerator Pilot is pressurized, the main valve cover chamber
is vented downstream (dry drain) or to atmosphere (wet drain), causing the valve to open fully. When the
cover of the Accelerator Pilot is de-pressurized, the main valve cover chamber is connected to upstream
pressure, causing the valve to close drip tight.
As water level decreases, static tank head pressure falls below the adjustable setpoint of the Altitude Pilot,
causing it to pressurize the cover of the Accelerator Pilot, opening the valve. As water level increases, static
tank head exceeds the adjustable setpoint of the Altitude Pilot, causing it to depressurize the cover of the
Accelerator Pilot, closing the valve drip tight. Valve opening and closing speeds are separately adjustable.
The Position Indicator with Air Bleed Petcock allows for visual indication of valve position, and easy venting
of air entrapped in the main valve cover chamber.
The adjustable Delayed Opening Feature “holds” high level static tank head pressure in the Altitude Pilot,
causing the main valve to remain closed as water level decreases. When static tank head pressure falls
below the setpoint of the Delayed Opening Pilot, the Altitude Pilot commands the main valve to open for tank
fill operation. Reservoir filling can be “delayed” until water level falls 3-15 feet (adjustable) below desired
shut-off point to increase water circulation through the tank.
Specify Tank height PRIOR to ordering.