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Great Wall ZVA automatic Nozzle
The ZVA is a fuel-dispensing nozzle with an automatic
safety shut off for wet-hose use with electrical
operated petrol dispensing pumps.
How the ZVA automatic works:
The flow through the nozzle creates
a vacuum at the valve seat. Air is drawn in through
the sensing port at the tip of the spout, through
the safety cut-out, past the diaphragm, and into
the fuel. The valve will remain open while the
air flows reely.When fuel reaches the sensing
port, suction builds up rapidly until it lifts
the diaphragm and trips the automatic action which
shuts the valve. The mechanic also trips if the
ball of the safety cut-off rolls back to obstruct
the free air flow. It will also occur if the spout
is pointed upwards or if the nozzle is dropped
onto the ground. The valve opens with the flow,
allowing smooth low control for to-the-penny dispensing.It
closes against the flow for a soft shock-less
closure
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