Hale MG - Manual (Page 18)

Muscle Pumps
1-11
Mechanical Seal
The mechanical seal is standard on the Qpak and
Qflo pumps and is available as an option on the
Qmax and Qtwo pumps. As shown in figure 1-10,
a stationary seal seat is in constant contact with a
rotating carbon face to prevent leakage. The sealing
boot is made of a rubber elastomer that is specifically
designed for high temperature operations.
Auto Lube ®
A miniature centrifugal pump is built into the shaft
of Hale Qmax and Qtwo model pumps (see figure
1-11). This miniature pump continuously forces oil
from the reservoir, through the bearing, and back
again. A balancing chamber behind the oil reservoir
is connected by a passage to the inlet side of the
pump. This chamber always keeps the pressure in
the oil reservoir equal to water pressure – whether
you are pumping at high inlet pressure or pulling
vacuum.
The miniature pump adds enough extra pressure to
constantly keep the flowing oil a few PSI higher
than water pressure. Thus, oil pressure inside the
double lip-type seal is always slightly higher than
water pressure outside. Dirt and water are repelled
by this higher pressure.
Auto-Lube
® does more than just fight off dirt. It
ensures continuous lubrication, even when you are
pumping dry. It permits the use of a compact,
double lip-type oil seal, and maintains a constant
film of oil under this seal to prevent shaft wear.
Because it is built into the main pump body, it
completely eliminates the need for a second set of
packing, or a second mechanical seal.
Figure 1-11. AutoLube
DOUBLE LIP
OIL SEAL
BEARING
OIL
RESERVOIR
BALANCING
CHAMBER
MINIATURE
CENTRIFUGAL
PUMP