6-2-6
FUNCTION
OF
THE DAMPING
VALVE
The damping valve
is
assembled in the
end
of
injection pum-p and
it
reaches the
seat before arrival
of
delivery valve at
the seat. The small orifice in the valve
is the passage
of
fuel to the chamber
in the delivery valve holder. Accordingly,
descending velocity
of
the delivery valve
is decreased, which prevents the negative
pressure being produced suddenly.
As
a result, proper injection
is
conducted
and the engine noise is decreased.
(See Fig.
67.)
DAMPING
VALVE
DELIVERY
VALVE
FIG.
67
FUEL
INJECTION PUMP
PUMP
DELIVERY VALVE DAMPING VALVE
HOLDER
HOUSIN
DAMPING VALVE
DELIVERY VALVE
DELIVERY VALVE
PLUNGER ASSEMBLY
CONTROL RACK
CONTROL SLEEVE
SPRING SEAT
PLUNGER SPRING
SPRING SEAT
PIN TAPPET
FIG.
68
0
SPECIFICATIONS
OF
FUEL INJECTION PUMP FOR THIS DIESEL
ENGINE
Model
Right
hand
twist Lead
6
mm
Lift
5.5
mm
Plunger diameter
ZEXEL
Maker
PFRIMD55/ 2NP1
I
Plunger spring arbitrary~
I
2.21
kg/rnm
I
~~ ~ ~
Delivery valve opening pressure
1.1 kg/mm
Delivery valve spring constant
Approx
1
5
kg/ cm*
~~ ~~ ~~~~ ~~~ ~
I
Rack stroke
I
10mm
I
-
43
-
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