Page 4-2 Document Ref 942005-001 Rev 2
TQP-HS for Fuel Dispensers Component Technical Manual
4 TROUBLESHOOTING
4.1 Outlet Pressure
The flow of the TQP-HS is regulated with the outlet pressure. To adjust the outlet pressure:-
1) Unscrew the pressure plug (item [20] in the schematic diagram).
2) Connect the pressure gauge via the flexible pipe into the hole of the outlet-cover (refer to
section 5.3 for specific tools).
3) Lift the nozzle out of its holder. When the pump starts to run (with the nozzle still closed),
check the pressure at the pressure gauge. On top of the by-pass cover, + and - indicate
which way the by-pass screw must be turned to increase (+) or decrease (-) the pressure.
When the desired pressure is adjusted, check whether the correct flow is reached.
OUTLET PRESSURE VALUES
The exact pressure value will depend upon certain installation characteristics. However,
when adjusting the outlet pressure, the following values for the pressure are to be respected:-
•For the TQP-HS 80 l/min models, the normal working pressure in by-pass mode should be
between 2 and 2.5 bar and should always be >1.7 bar.
•For the TQP-HS 130 l/min models, the pressure should be between 2.5 and 3.5 bar.
•For dispensers delivering 160 l/min or 9.6 m
3
/h (i.e. two TQP-HS 80 pumping units in
parallel), the pressure of one pumping unit must be 0.2 bar higher than the other one.
Outlet pressure plug
Outlet valve seat
Vortex valve cover
By-pass adjustment
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