Putting Into Service; In Case Of Trouble - Elaflex ZVA 32 Instrucciones De Montaje Y De Uso

PUTTING INTO SERVICE

The ZVA 32 is a fuel-dispensing nozzle for gasoline and diesel with an automatic safety shut off
for wet-hose use with electrically operated petrol dispensing pumps for a maximum of 200
litres/minute, pressure range 1,5 - 6 bar.
The ZVA 32 fulfils the conditions of the European Weights and Measures as well as EN 13012.
TÜV approval see page 14.
Each nozzle has been subjected to stringent tests before leaving the factory and validated by the
applied markings and date code.
The ZVA 32 is supplied ready for connection to the hose. After assembling and switching on the
pump operate the lever (9) several times to vent air from the hose. Then check :
Is the nozzle, hose connection and swivel tight under pressure?
Does the pump switch off when putting the nozzle back into the nozzle booth?
MAINTENANCE
The nozzle does not require any lubrication.
Safety checks: Regularly inspect the nozzle visually for damage. Pay attention that the spout
serration secures the nozzle in the filler neck. Test the 'minimum' shut off and the safety cut off
function (3) during the annual pump maintenance and instantly in case of damages which may
effect the vacuum.

IN CASE OF TROUBLE

IF THE NOZZLE DOES NOT CLOSE AUTOMATICALLY usually the vacuum required to operate
the automatic action is too low. With the pump running, fully pull the lever (9) to check that full
flow can be obtained. Also check, if a loose spout, damaged vacuum cap (5) or clogged strainer (8)
have caused the pressure drop.
IF THE ZVA KEEPS TRIPPING OFF PERMANENTLY usually the air passage (2) is blocked.
First check if it is caused by the ball of the safety cut off, by shaking the nozzle. If the ball is free
to move, it will rattle. To clear the air passage, blow compressed air up the spout until air comes
out of the sensing port (1).
IF YOU CANNOT MAKE IT WORK please call your service contractor. They have the skills and
parts needed to restore working order.
HOW THE ZVA AUTOMATIC WORKS
The flow through the nozzle creates a vacuum at the valve seat (6). Air is drawn in through the
sensing port (1) 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 freely. When fuel reaches the sensing
port, suction builds up rapidly until it lifts the diaphragm (4) and trips the automatic action which
shuts the valve. The mechanism also trips if the ball of the safety cut-out (3) rolls back to
obstruct the free air flow. This will occur if the spout is pointed upwards or if the nozzle is
dropped onto the ground.
The valve opens with the flow, allowing smooth flow control for 'to-the-penny dispensing'.
It closes against the flow for a 'soft' shockless closure.
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Description see page 16
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