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Service Training

Section 4.9

Page 41

12.05

FUNCTIONING OF THE VACUUM-CONTROLLED SHUTOFF VALVE

When the engine is off, the shutoff valve is in closed position. No LPG can flow to the vaporisor. When the

engine is started, a vacuum is present in the intake section, which develops through the intake stroke of the

engine. This vacuum is passed through a tube connection from the mixer via connection (11) to the top of

the diaphragm (9) in the shutoff valve. The pressure difference between the top and bottom of the diaphragm

(9) creates an upward displacement of the diaphragm. The diaphragm (9) thereby activates the lever (8)

which acts on the valve shaft (7). The valve shaft (7) is displaced upwards and thereby opens the plate valve

(4) against the initial tension of the leaf spring (5). LPG can now flow through the filter plate (1) to the vaporisor.

6 LPG outlet, filtered

7 Valve shaft

8 Diaphragm lever, to open valve

9 Diaphragm

10 Vacuum space

11 Vacuum inlet from mixer

1 Filter plate

2 Supporting plate, perforated

3 LPG intake

4 Plate valve

5 Leaf spring, to shut valve

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Deutz 1012 Specifiche Pagina 267