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Valve systems for Off-Road Tyres

Tyre valve stem OTR Tyre

Since 1970 Haltec has been a world leader in tyre valves and tyre valve systems for all types of vehicles. The following sections break down the different valve categories that Haltec supply to the OTR industry.

Large Bore Valve System

The large bore valve is the oldest of the four off-road tyre valve systems. Here are the basic components of the large bore valving system. There are two basic spud designs

  • The standard clamp in spud H-41
  • The screw-in spud C-10

Into one of these spuds, you screw a large bore swivel valve.   While all large-bore vary in bend, length and appearance they all have a swivel feature.  An O-ring seal screws into the valve spud and is tightened down with a swivel nut.

To service the inside dual there are three types of extensions offered

  • A rigid extension (867 series)
  • A hand-bendable extension (753S series)
  • A flexible extension (810F) series 

Super Large Bore Valve

The super large bore valve system was developed in 1972. There are four parts to the valve and a unique inflator is used to maximize the airflow.

There are three spud designs:

  • The standard clamp in spud (T-81/T-82)
  • The screw-in spud (C-100/C-155)
  • The angle screw-in spud (S-85)

The next component is the swivel angle connector which threads onto the spud.  There are different angles and lengths to accommodate the requirements of the customer (R-525 series).

The next component is the flexible extension that can be made in any length (MT-3000 series).

The core housing makes up the final component. It contains a large bore valve core for servicing the tyre assembly for routine pressure checks and allows the complete core housing removal for the super large bore application. It can also be installed in any of the previous components for a shorter valve (R-520)

To maximize air flow, an IN-100L or IN-95L inflator is used to remove the core housing during inflation and deflation. A kit to allow extension assembly in the field is available. Rigid valves are also available. Super large bore valves are FOUR times faster than a large bore valve.

Z-Bore valve system

The z-bore valve system is very similar to the super large bore valve system.  By using an o-ring seal to clamp the spud to the rim, a greater flow diameter is created without sacrificing strength or performance.   

There are three basic spud designs:

  • The standard clamp in spud (Z2)
  • The screw-in spud (Z1)
  • The angle screw-in spud (Z4)

The second component is the swivel angle connector which threads onto the spud.  As with the super large bore valves, you can install a core housing into the spuds to make a valve (Z3-90 series).

The Z-bore flexible extension can be made into various lengths. 

The Z10 core housing is the final component. It contains a large bore valve core for servicing the tyre assembly for routine pressure checks and allows the complete core housing removal for the z-bore application.

To maximize air flow, a Z12L or IN-95L inflator is used to remove the core housing during inflation and deflation.  The inflator operates like the super large bore inflator. Like super large bore extensions, you can use a kit to allow extension assembly in the field.   Rigid extensions are also available. Z bore flows 370 CFM compared to 240 CFM for super large bore.

Mega Bore Valve

The mega bore valve system is unique because it uses a 15/16” valve hole versus the 13/16” hole in all three previous systems.  Here are the components

There are three types of spuds:

  • The 15/16” clamp in spud (MB-20)
  • The angled screw in spud for ¾ NPT (MB-12-85 series)
  • Screw-in spud (MB-26)

The second component is the angle connector which screws onto the clamp in or screw in spud. The rigid mega bore valve can be screwed into the angle adapters and angle screw in spuds.

The next component is either the rigid mega bore valve or the mega bore flexible valve which has the retractable core housing permanently assembled to the extension. The original mega bore valves have a retractable, but not removable housing. The mega bore uses a removable housing similar to super large bore and Z bore.

There is a unique cap to the mega bore system to protect the side vent holes (MB-13).

To maximize airflow an MB-8 is used on the old style mega bore to retract the core housing during inflation and deflation. The new style uses IN-95L inflator. Mega Bore flows 550 CFM

Estry Trading | Australia’s leading distributor of Haltec Products

Estry Trading Company Pty Ltd is proud to be associated with high-quality Haltec products since 1977.

The organisation stocks a range of quality Haltec products at its warehouse facilities in Sumner Park, Brisbane, Australia. Estry supplies the mining industry, resellers and its distribution network throughout Australia, Asia Pacific and the Middle East.

A complete range of tyre valves and tyre-related accessory products for:

  • Off-Highway Vehicles;
  • Mining / Construction / Forestry Equipment;
  • Heavy-Duty Trucks;
  • Light Trucks;
  • Buses;
  • Passenger Cars;
  • Tractors / Farm Implements;
  • Motorcycles.

For more information call Estry 07 3376 4155 or visit Haltec.com.au

Estry Trading Haltec

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