Page 2-8 Document Ref 942005-001 Rev 2.2
TQP-HS for Fuel Dispensers Component Technical Manual
The vortex body exists of two valves in parallel:-
• The vortex regulating valve [12]
A piston spring loaded valve which gives a constant headloss between the air
separation channel and the recovery chamber. This valve stays open to keep
the air separation system working at any pressure or flow.
• Low-pressure vortex valve [14]
A piston spring loaded valve which opens when the pressure is less than 1 bar.
2.6.4 OUTLET VALVE
Once the liquid has had the air/vapour extracted, it enters the high-pressure
chamber located on the down-stream circuit after the vortex. In this chamber, a
spring loaded non-return outlet valve [22] performs the dual function of:-
• An authorisation valve (opening when the pressure is sufficient) and
• A non-return valve which will keep pressure on the measuring system. This is
necessary to avoid start up errors at the next pumping cycle. Within the valve,
a pressure overload vent limits this pressure.
An aeration valve is placed on the other side of the outlet channel. This valve
performs air separation in two stages:-
• at high level presence of air, the aeration valve opens to keep the pump at low
pressure (up to 0.7 bar) and the outlet valve is closed. The air is then removed
from the pump via the vent [8].
• as the air proportion reduces, the pressure in the pump increases and the aeration
valve closes. Fuel and air pass through the vortex separation system and the
pump is then ready to distribute fuel when the nozzle is opened.
2.6.5 RECOVERY CHAMBER
In the recovery chamber [10] the following flows are collected back:-
• The vapour/liquid flow from the central canal of the vortex [18]
• The flow through the aeration valve in the outlet channel [24] (only when the
pressure is < 0.7 bar)
These flows are necessary for the functioning of the system and together they
amount to approximately 8 l/min. These flows are brought back to the pump
inlet by the recovery float valve [6].The specially designed recovery float valve
maintains the liquid at a constant level.
2.6.6 VENT TO ATMOSPHERE
A vent [8], located at the highest point on the cover, maintains the recovery
chamber at atmospheric pressure.
The gas that is extracted from the central channel of the vortex is released into
the atmosphere by this vent. According to certain local regulations, a pipe or
hose must be connected to this vent.A non-overflow device [7], made by a float
operated valve, is put in the vent channel.
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