Lapped Spool and Sleeve Assembly
The Numatics lapped spool and
floating sleeve assembly is a matched set, machined from
stainless steel to millionths of an inch precision. It's
patented, balanced construction relies on an air bearing
principle, eliminating troublesome dynamic o-ring seals.
The sleeve remains stationary in the valve housing,
floating on six static seals.
The sliding spool is sealed simply by virtue
of the close finish tolerances.
With
the spool floating on a film of air molecules, there is no
metal-to-metal contact. Heat-treating of spools and
sleeves gives a hardness necessary to combat pipe scale
and other air line contaminants. The spool is balanced
with respect to air pressure, and offers extreme
versatility of valve application. It supplies true
multipurpose construction. The floating sleeve insures
freedom from any
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mechanical
distortion imposed on the valve body. Lubricated or
properly filtered dry air will insure longer life;
however, the spool and sleeve’s unique design,
inherent resistance to contaminants and sticking,
will provide years and years of troublefree service,
exceeding industrial standards of design and
performance.
All these factors give the
Numatics Spool and Sleeve a reliability and long
service life which have been field proven in
maintenance-free operation, typically outlasting the
life of the machine on which it was installed.
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