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 The
Model 750-66 Bi-Level, Non-Modulating Float-Control Valve
is an automatic control valve designed for low-level and high-level
control of water in reservoirs and storage tanks.
It is a pilot-controlled, hydraulically operated, diaphragm-actuated
globe valve in either the oblique (Y) or angle pattern design.
The Model 750-66 Bi-Level, Non-Modulating Float-Control Valve
operates independently of valve differential pressure. The double-chambered
diaphragm actuator always has full differential pressure to
develop maximum power and immediate reaction.
The lower control chamber is vented to atmosphere and the upper
control chamber is alternately pressurized or vented by the
opening and closing of a 4-way float pilot which senses the
preset low- and high-water levels. The 4-way operation allows
the main valve to be fully opened even at very low system pressures
which provides minimum head loss across the valve.
 The
float pilot senses a low- and high-water level in the tank or
reservoir and will alternately pressurize and vent the upper
control chamber of the main valve.
The pilot can be connected to provide either main-valve closing
at high level or low level. For high-level closing the adjustable
float ball rises to the high-float stop and causes the float
pilot to switch position.
This pressurizes the upper control chamber causing the main
valve to close and stop flow filling the tank. As tank level
drops the main valve remains closed until the float ball drops
to the low-float stop pilot and causes the float pilot to switch
position.
This vents the upper control chamber causing the main valve
to open and start flow filling the tank. The sequence of pressurizing
and venting the upper control chamber is reversed for low-level
closing.
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Valve Line Up
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