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Verfügbare Sprachen
Verfügbare Sprachen
PUTTING INTO SERVICE
The ZVA 25 is a fuel-dispensing nozzle with an automatic safety shut off for wet-hose use with
electrical operated petrol dispensing pumps. Working pressure 0,5 up to 3,5 bar, temperature
range -20° C up to +55° C ( LT type -40° C up to +55° C ).
The ZVA 25 fulfils the conditions of the European Weights and Measures as well as EN 13012.
TÜV approval and ATEX certificate ( category Ex II 1G ) see pages 14-15. Each nozzle has been
subjected to stringent tests before leaving the factory and validated by the applied markings and
date code.
The ZVA 25 is supplied ready for connection to the hose. After assembling and switching on the
pump, point the spout vertically towards the ground and operate the lever (9) several times to vent
air from hose and nozzle. Carry out a complete functional testing of the nozzle. 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 boot?
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 FAILS TO OPEN : The pump pressure may be too low to push the valve poppet
open. If the pump pressure cannot be increased, disconnect the ZVA, remove the swivel, pull the
lever to the open position and push the valve stem to free the poppet ( 7 ).
IF THE NOZZLE DOES NOT CLOSE AUTOMATICALLY : 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 : The air passage is blocked ( 2 ). 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 through the spout until air
comes out of the sensing port ( 1 ).
IF YOU CANNOT MAKE IT WORK : 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,
a vacuum 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 obs-
truct the free air flow. It will also occur if the spout is pointed upwards or if the nozzle is dropped
onto the ground.
4
Description see page 16
HINTS FOR PROPER HANDLING
INSERT THE SPOUT FULLY INTO THE TANK. The ball of the safety valve rolls forward
to open the safety cut out. This is the best way to fuel.
A
Make sure that the ZVA is hooked firmly into the fill pipe so that it cannot slip out
during refuelling.
With some near horizontal fill pipes version A is not possible. The safety cut-out attitude
B
valve prevents the valve from opening. The ball rolls backwards blocking the sensing path
and the nozzle trips off continuously.
With situation B lift and hold the nozzle so that the ball now rolls forward opening up the
C
sense path. Refuelling is now possible provided the nozzle is kept in this position.
DO NOT FILL TOO FAST : Splashing fuel can trip the nozzle before the tank is full. Some
D
filler necks are difficult to refuel. Fuel at lower speeds to avoid fuel blow backs. The
flowrate can be adapted to the capacity of the filler neck by the three - speed lever latch.
First position
3/3 = Fully opened for straight and near vertical fill pipes
Middle setting
2/3 = Reduced output for narrower fill pipes.
Lower position 1/3 = Slow position for poorly vented pipes.
THE AUTOMATIC SHUT OFF WILL ALSO WORK IF THE LEVER IS HELD OPEN MANUALLY,
according to EN 13012. Once the fuel touches the sensing port (1) the automatic cuts off. Topping
up is possible.
A FEW DROPS OF FUEL WILL REMAIN IN THE NOZZLE SENSING PORT ( 1 ). Always tilt the
nozzle forward into the tank to drain for a few moments before returning it to the nozzle boot.
Then the next user will not be surprised by drips.
PLEASE NOTE
The ZVA 25 is approved for all gasoline and diesel fuels in a pressure range of 0,5 – 3,5 bar
( special type with stronger main valve spring: up to 5 bar ) and flowrate up to 140 litre /minute .
The ZVA opens automatically when the pressure exceeds 6 bar ( special type: 7,5 bar ). If it is
intended to use it for other applications you should consult your supplier who will be pleased to
advise its suitability on receipt of full details, including fluid, and operating conditions.
GUARANTEE
We guarantee against defective materials and manufacturing up to 18 months from date
of supply. If the supply date cannot be established, the date code on the nozzle applies
( e.g. • 23 = 1
st
quarter 2023).
Excluded are nozzles and parts subjected to wear and tear, abuse and to contamination.
Furthermore excluded are damages by misuse, indirect damages and costs, travelling
related to exchange and repair work. We refuse any liability for consequential loss or
damage resulting from the use of our nozzle.
Description see page 16
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