User's Manual

L12100
VALVE
PORT
PISTON A
CHAMBER B1
CHAMBER B2
PISTON B
FLOW
INJECTOR OPERATION
Lubricant from the pump is supplied either to the manifold which,
in turn, provides lubricant to the manifold injectors, or directly
to the bearing point injector. Figure 12 represents a typical
manifold injector. When pressurized lubricant enters the injector
inlet, piston A shifts until the valve port is exposed. Lubricant
fl ows through the valve port and is directed behind piston B to
chamber B1. This forces piston B towards the outlet, dispensing a
measured amount of lubricant from chamber B2 to the bearing.
When the pump has completed its dispense cycle it allows the
pressure in the feed lines to vent. This allows piston A to shift
back towards the inlet, opening the valve port to piston B. Piston
B shifts, transferring the volume of lubricant in chamber B1
to chamber B2. This primes the injector in preparation for the
next dispense cycle. This operation is identical in both types of
injectors.
Figure 12. Injector Operation
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Note: Although oil and grease injectors operate in the same
manner, each design has been optimized for use with its type
of lubricant and system operating conditions. Oil injectors are
designed for lower viscosity lubricants, higher cycle rates and
lower operating pressure. They will not function properly with
grease. Grease injectors are designed for grease consistency
lubricants, low cycle rates and higher operating pressure. Their
output accuracy will decrease with lighter lubricants and their life
will be considerable reduced if used on high cycle rate systems.