Idex Liquid Controls A8180 Series Installation-Parts page 9

Bypass ports provide a pathway through the mechanical air eliminator housing to allow air or
vapor to pass from one side of the air eliminator to the other while the valve plate vent ports
are sealed.
Limited Bleed Tee Assemblies
Some Liquid Controls mechanical air eliminator models are
designed without bypass ports in their housings (for
example, bulk plant air eliminators). For those models to
retain the functions of a limited bleed valve plate, a limited
bleed tee assembly can be installed in the piping.
Dual-Head Bulk Plant Air Eliminators
By employing two air eliminators–a high-mount air eliminator and a low-mount air eliminator–
dual-head bulk plant air eliminators save the metering system from shocks incurred by
recurring small slugs of air (or vapor) and prevent large slugs of air from passing by the air
eliminator and through the meter system.
Each time a standard air eliminator removes a small slug of air, it closes the downstream
differential valve. When the differential valve closes at a high flow rate, meter systems can
incur a significant hydraulic shock. Repeated shocks of this nature can shorten the life of the
metering system.
Dual-head bulk plant air eliminators have a high-mount air eliminator that eliminate small slugs
of air without stopping the product flow through the meter system to save the system from
shock. Dual-head bulk plant air eliminators also have a low-mount air eliminator to remove
large air slugs.
Occasionally, large slugs of air can overtake a standard air eliminator, and excess air can blow
by the air eliminator and pass through the meter–which can cause inaccurate metering. With a
dual-head bulk plant air eliminator and a differential valve as part of the metering system, the
float in the low-mount air eliminator drops in the presence of a large slugs of air, the differential
valve senses the presence of air as the pressure above and below the diaphragm, and the
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Mechanical Air & Vapor Eliminators
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