Product finder


The 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 transfer.

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 time.


  • Flows up to 1,000 L/min
  • Fully mechanical design integrated with hydraulic principles 
  • Eliminates blockage and electronics failure
  • Cannot be over-ridden
  • Reduces costs associated with fuel wastage


Hydrau-Flo® valve system:

  • prevents overfilling
  • prevents fuel spillage and wastage
  • removes the risk of tank rupture due to pressure build up during and after filling
  • minimises the risk of fire as a result of fuel spillage
  • reduces costs associated with fuel wastage and equipment damage
  • significantly improves safety and environmental outcomes


hflo video link


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 trucks.

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 applications.

Float control valve

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.

Flaot control 2

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

Hydrau-Flo® Valves Operation - filling a tank

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 Hydrau-Flo® valve.

With the pressure balanced the spring will then close the piston and stop fuel flow.

Click on image below to enlarge

Hydrau-Flo® Valves Operation - full tank

Tell us about you

Tell us how we can help

Enter the text shown below

* required field

Tell us about you

Tell us about your requirements

Enter the text shown below

* required field
File title File size Type

Hydrau-flo valve brochure

4965 KB PDF
Get Adobe® reader

Help To prevent files from opening in your web browser rather than downloading to your hard disk, please follow these instructions:

PC users Right click the desired link and select "Save target as..." or "Save link as..."

Mac users Right click or press Ctrl and click the desired link and select "Download linked file as..." or "Save link as..."

RSS Feed

News headlines