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MECO’s patented EAS seal is available
for a variety of applications in pulp and paper mills,
particularly pulpers, stock chest agitators, and repulper
and chip screws. Water-flushed EAS seals are also used extensively on wet building products applications like stucco, gypsum and drywall mud mixers.
One of the seal’s principal attributes
is its ease of operation. The seal face pressures are
fully-adjustable; there are no internal springs to loosen
due to seal face wear, or to corrode in hostile chemical
environments. All adjustment hardware is located outside
the seal’s purge cavity, so the seal can be adjusted
with no disassembly, often while the equipment continues
to operate.
The EAS accommodates severe shaft runout
and lends itself well to applications where mechanical
packings and traditional mechanical seals fail to function.
The seals are manufactured fully-split, in most cases
permitting installation and rebuilding without removal
or modification of the existing stuffing box, bearing,
or drive.
What's Inside...
The EAS's external adjustment feature permits field calibration
of the seal without disassembly. As seal faces wear, the
EAS can be adjusted to compensate, before significant
leakage occurs. Monitoring the extent of adjustments permits
planned maintenance, without catastrophic seal failures.
The EAS is an unbalanced, double
mechanical seal. The patented design places two rotating
seal faces against a central driving elastomer. The
elastomer turns with the shaft, and the two rotors turn
with the elastomer. The elastomer provides both a static
seal against the shaft and motive force for the rotors,
and serves as the load spring for the seal.
Wide radius faces permit the seal
to accommodate anywhere from a standard 1/4" to 3/8"
or more of total shaft runout. Split stationary faces
are replaceable, making rebuilds simple and inexpensive.
A water flush trickles into the top
of the seal cavity and out a vent at the bottom, (or
side-to-side in vertical applications), providing cooling
and expelling any stray fiber which might make its way
past the primary seal face. While mechanical packing
requires water leakage across the seal interface, the
EAS does not, and flush water is confined to the area
between the two seal rotors. Since the flush runs at
zero pressure, no water leaks past the seal faces, and
stock dilution cannot occur.
Applications
The EAS is an outstanding seal for pulpers, providing
the runout tolerance necessary to resist tub deflection
from heavy bales and slabs. Rugged stainless steel housings
and rotors combine with high-performance bearing plastics
to form an exceptionally-durable seal. Unlike delicate,
hardfaced mechanical seals, EAS components can be freely
handled, and even dropped without damage.
EAS seals are effective on horizontal
stock chest agitators, on cantilevered shafts and on
older through shafts and midfeather agitator designs.
The fully-split design allows installation and rebuilding
without pulling the agitator drive. The EX-PAC variant
combines all the versatility of the EAS, while also
permitting live-loading of the seal faces, making it
perfect for the most demanding abrasive stock and coating
applications.
MECO seals were originally developed for screw conveyors,
and they still excel on stock washer repulper screws and
on TMP chip conveyors. In addition to the EAS and Ex-PAC
series, MECO's AH and MD-series seals have a variety of
applications in the pulp & paper industry, as does the
Static Seal for stock chest agitator shafts and the MECO-DR
for Moyno® brand progressing cavity pumps.
MECO EAS Seals
- tolerate shaft runout and shock
loads
- keep fiber in your process machinery,
and out of your fiber recovery system
- won’t dilute stock or coatings
- use less flush water than packed
glands
- reduced friction can reduce agitator
drive current drain
- Fully-split design speeds installation
and rebuild
- Custom tailoring eliminates equipment
modifications
Ordering Information
MECO seals are custom-designed to each application. Your
local distributor
can help you with the application process, collecting
the dimensional, product and process information needed.
When ordering any EAS-series seal,
it is essential that information be supplied concerning
the shaft diameter, RPM, operating temperature and pressure
and what material is being processed, as well as whether
the shaft is horizontal, inclined or vertical.
Should you require additional information,
or the name of the authorized MECO distributor in your
area, please don’t hesitate to call.
Product Literature
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