195
Mode of operation
When the pump is inoperative, cylin-
der(6) communicates via the feed ho-
les(5) with reservoir(2) containing the
antifreeze. When plunger rod(1) is
depressed, piston(4) moves down-
wards, closeing feed holes(5) and
causing approx. 1cm
3
of antifreeze to
be injected into the air stream, via
check valve(7). As long as plunger
rod(1) is in the operating position, the
further flow of fluid of from reser-
voir(2) is interrupted. When plunger
rod(1) and piston(4) are released,
they are moved back to their original
positions, due to the action of return
spring(3). Compression spring(8) clos-
es check valve(7), and cylinder(6) is
again filled with antifreeze through
feed holes(5). At any further stroke,
prior to setting off and with the com-
pressor in operation, appr. 1 cm
3
of
antifreeze per stroke is fed into the
air stream. Following any pump oper-
ation, several brake applications must
be made.
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