M-18
WG972-E2, DF972-E2, WSM
GASOLINE / LPG ENGINE
■ Secondary Chamber
The fuel adjusted with primary chamber to the
specified pressure enters secondary chamber (5)
between secondary valve (1) and the valve seat (2) and
is decompressed to the vicinity of the atmospheric
pressure almost.
A secondary valve is assembled to a part of the
secondary valve lever (3) supported to body and is shut
by the tension of the spring of a secondary valve spring
(4).
A secondary diaphragm pin (6) touches the edge
besides this lever (3).
The one side of secondary diaphragm (8) is faced in
secondary chamber and the other side faces
atmosphere chamber (10).
When the engine stops, the atmospheric pressure is
led in secondary chamber and a secondary valve is shut
by the tension of a secondary valve spring.
When the engine rotates, the negative pressure is
generated in the venturi tube of the mixer.
As for this negative pressure, working secondary
diaphragm (8) is pulled to the second chamber side by
the difference pressure with atmosphere chamber by
second chamber.
Do the push up of the secondary valve lever (3) by
this working, secondary valve is opened, and the fuel
flows in.
When pressure in chamber rises by the fuel which
flows in, the diaphragm is pushed to the atmosphere
chamber side and narrows the opening of the valve and
decreases the supply of the fuel.
Secondary chamber is almost maintained in the
atmospheric pressure by the thing to repeat such
working.
W1014568
(1) Secondary Valve
(2) Valve Seat
(3) Secondary Valve Lever
(4) Secondary Valve Lever
Spring
(5) Secondary Chamber
(6) Diaphragm Pin
(7) Balance Spring
(8) Secondary Diaphragm
(9) Balance Lever Spring
(10) Atmosphere Chamber
(11) Idle Adjust Screw
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