Treloar Products

Specialty fluid handling products to support your chemical, petroleum and process solution requirements. 

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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

Sep 29, 2020
Welcome to our new digital home
As you may have noticed, things have changed a little bit around here.  

Sep 28, 2020
Project: Loading Arm for Propylene Glycol (PGI)
This was a loading arm for Propylene Glycol (PGI), the customer needed it in a very short lead-time and we were able to deliver. Typically, this type of arm would take us 8-10 weeks as they are manufactured to order in our workshop, but we were able to deliver in just 6 weeks including painting and ...

Sep 27, 2020
Industry coupling offers LNG innovations
Treloar Trading and its international partner ARTA are offering the global market new LNG products, including gas dry break and breakaway coupling technology as well as cryogenic equipment for loading and unloading. LNG is a global commodity accounting for a significant percentage of worldwide gas ...