Hydrau-Flo® valve system is a safer,
cleaner and more reliable fuel filling valve arrangement which
removes the risk of overfilling, spillage and tank rupture while
minimising safety and environmental hazards associated with fuel
Using conventional systems,
overfilling, spillage and tank rupture can be common occurrences.
At 1,000 litres per minute, every second of spillage equates to
more than 15 litres of diesel wasted and released into the
environment while the cost to repair or replace ruptured fuel tanks
is significant in terms of materials, labour and equipment down
- Flows up to 1,000 L/min
- Fully mechanical design integrated with hydraulic
- Eliminates blockage and electronics failure
- Cannot be over-ridden
- Reduces costs associated with fuel wastage
fuel spillage and wastage
- removes the
risk of tank rupture due to pressure build up during and after
the risk of fire as a result of fuel spillage
costs associated with fuel wastage and equipment damage
- significantly improves safety and environmental
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Hydrau-Flo® fuel filling valve range
The Hydrau-Flo® fuel filler
safety valve range is available in three configurations to
suit the majority of equipment types and applications.
The standard Hydrau-Flo® fuel filling (black)
valve is ideal for all new equipment applications and existing
equipment that has suitable fittings. The compact design delivers
the highest flow rate capacity in the range.
The most commonly used retro fit Hydrau-Flo®
fuel filling (blue) valve fits directly into truck and loader fuel
tanks using the same thread (2” NPT) as the conventionally used dry
break fittings (which are screwed back into the Hydrau-Flo fuel
filler valve). These valves fit into typical CAT and Komatsu
fuel tank recesses.
This retro fit Hydrau-Flo® fuel filling
(red) valve is designed to fit into tanks using
the “Wiggins” ZNC3 recess. These are typically used on 776 and 773
Hydrau-Flo® float control valve range
Also Available in different configuration, designed to
suit varying applications and filling requirements
The Hydrau-Flo® float control valve has a
robust design for use on mobile equipment which ensures reliable
pilot operation of the Hydrau-Flo®
fuel filling valve. It also incorporates unique,
patented roll over shut off protection and an anti fuel surge
breather vent to prevent spillage that can occur as a result of
vehicle motion when using “conventional” valves.
This valve is available with two stem lengths (according to fill
level requirements) and must be used on all mobile equipment
The type of control valve illustrated below is typically
used on stationary equipment including skid mounted pump sets,
generators and lighting plants. The simple and robust design
provides a lower cost option for stationary equipment and is
available in two different lengths.
Hydrau-Flo® valves - operation
Fuel enters the system through a conventional “fast fill”
receiver and then flows into the Hydrau-Flo®
valve. Fuel pressure forces the shut off piston open against spring
pressure and then flows through porting into the tank.
An orifice in the piston directs fuel through a capillary line
to the float valve which allows a constant bleed into the tank
until filling is complete.
This ensures that the pressure under the piston remains lower
than that above.
Click the image below to enlarge
When fuel reaches the required level the Float Valve is closed
and the bleed into the tank is shut off. This equalises the
pressure on both sides of the piston in the
With the pressure balanced the spring will then close the piston
and stop fuel flow.
Click on image below to enlarge