3
2.2.1 Combined pump and air separator
The pumping unit is belt driven from an electric motor and has an integral air separator. The
pumping unit is manufactured by Tatsuno, and is designated the PGS-0257-H. This high speed
pumping unit is connected to two meters. The delivery rate is 45 L/min at each nozzle.
Fuel is drawn in via the inlet and passes through the strainer into the rotary pump. A by-pass
valve circulates liquid returning at a predetermined pressure to the pump inlet. Fuel passes
through the air separator where any air present is allowed to pass to the float chamber. The
float chamber houses a float operated valve that permits excess liquid to be returned to the
suction side of the pump. air is vented from the float chamber to the atmosphere via an
overflow protection valve. Liquid in the outlet chamber leaves the pumping unit via a check
valve.
2.2.2 Meter
The meter, designated type 02515-J, is a four-piston positive displacement type. The body of
the meter is made from aluminium alloy and the cylinders have stainless steel liners.
Calibration is by adjusting the stroke using an adjusting handle. This handle has a through hole
to accept sealing wire. The meter shaft rotates twice for every litre of fuel delivered.
2.2.3 Pipework
A pipe from each meter is routed via a solenoid valve to the hose retractor assembly. Each pipe
is then fixed to its respective hose, the hose terminating in a nozzle. Nozzles are stowed in
holsters along the sides of the hydraulics module.
2.2.4 Solenoid valve
A single-stage solenoid valve is fitted on the discharge side of each meter. When energised the
valve allows full flow of the liquid to the selected nozzle.
2.2.5 Nozzles
The following nozzles may be used:
ZVA 4.4R for use with unleaded petrol
ZVA 4.4 for use with leaded petrol and diesel
ZVA 25.41 high flow nozzle for diesel
ZVA Slimline Drip Stop nozzle Minimum
Delivery 5 litres. (A legend indicating a 5 litre
minimum delivery will be marked on the spout
of the nozzle, this marking overrides that marked
on the dispenser).
ZVA X204 GRV3G for use with unleaded petrol
ZVA X204 GRV3R-BL for use with leaded
petrol
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