Treloar Products

We specialise in engineering and supplying reliable critical fluid transfer equipment for tank trucks, service stations, terminals, depots, gas production plants and more.

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Order codes Spares










The OPW 99ASV contains no adjustable, replaceable, or repairable parts.









The OPW 99ASV anti-siphon valve is designed to automatically shut off flow of product in the event the line is broken. This feature helps prevent fuel spillage and fire hazards.

All 99ASV anti-siphon valves are equipped with a pressure relief valve, to relieve thermal expansion. They are available in 40mm and 50mm NPT sizes, smaller sizes available on request. Two different hydrostatic head pressure settings are stocked: 3m and 4.5m - other settings also available on request.

Complies with AS 1940-1993.


The 99ASV is recommended to be installed on the top of the Above Ground Tank. See the attached recommended installation, the A measurement from the top of the tank to the lowest point of the fuel supply line is critical for the correct selection of the anti-siphon valve. We recommend the combination of the 99ASV with a 10BM under pump shear valve for maximum protection from fuel spillage


99ASV-2150: Anti-siphon Valve 40mm x 3m
99ASV-2200: Anti-siphon Valve 50mm x 3m
99ASV-3150: Anti-siphon Valve 40mm x 4.5m
99ASV-3200: Anti-siphon Valve 50mm x 4.5m

Latest news

Jun 20, 2022
A nitric acid transfer solution for Malindra Group
We often get called in by customers who are using a product that hasn’t been working for them. There’s nothing more we love than problem-solving and finding a solution that works!  

Jun 02, 2022
Problem-solving for the Koppers Australia - Newcastle Plant
The team at the Koppers Australia - Newcastle Plant recently approached us with a tricky challenge. They advised they have a need to load and unload ships with products that are quite difficult to deal with without damaging the ship loading hoses and spilling product. 

May 04, 2022
Unique design solution to onsite mining challenge
Treloar was recently approached by engineering firm, Aspec, to come up with a structural solution for BHP for an onsite mining challenge.

Apr 04, 2022
Progress Update: Wesfarmers-CSBP liquid ammonia loading arms
In December 2021 we shared our initial case study on our project for Wesfarmers-CSBP who had successfully been using a Treloar solution for their liquid ammonia transfer system since 1998. In 2021 Wesfarmers approached Treloar with a need for emergency breakaways, which led to a plan to address ...

Dec 08, 2021
Case Study: Wesfarmers-CSBP liquid ammonia loading arms
Wesfarmers-CSBP has been using a Treloar solution for their liquid ammonia transfer system since it was originally installed in 1998 when Treloar worked with an international supplier to deliver many cutting edge projects and introduce new technologies to Australia. In this case, it was for Ammonia ...