When scale formation occurs on the moving elements of ball, butterfly, plug, or gate valves the consequence is either locking of the valve movement or damage to the valve seats, guides and packing along with the consequent leaking through or out of the valve. Locking up of the valve actuation can potentially raise safety concerns if work needs to be done on lines or equipment around the valve.

Since its development in 1995 the Stargate-O-Port-Valve^® AS™ anti-scale valve has eliminated scale formation concerns and related issues in a variety of industrial settings. Using a combination of coatings, seat design, and valve internal features, the negative aspects of scale formation or sticky flow media are mitigated. Experience tells us that no two scale forming process applications are the same and SVC applies this experience to the valve design specific to each application. Variables such as temperature, pressure, precipitating materials, flow characteristics, and process chemicals will dictate different configurations of design features.

The Stargate-O-Port-Valve^® AS™ anti-scale valve is installed in a variety of applications including mine dewatering isolation, food processing, black liquor heaters, green liquor line sand clarifiers, lime storage, and fly ash bins with great success. One application in a hydrometallurgy autoclave for a gold mine 12” knife gate valves were used that had to be replaced every six weeks. The customer has installed Stargate-O-Port-Valve^® AS™ anti-scale that provided 6 years of reliable service before the first refurbishment. One should note that the first refurbishment was done on a preventative basis and the other five valves have been in continuous service for over 15 years. The Stargate-O-Port-Valve^® AS™ anti-scale valve has exhibited similar results in other applications involving sticky or scaling materials that tend to seize or damage other valve designs and configurations.

As the Stargate-O-Port-Valve^® AS™ anti-scale is applied to more unique, critical, and demanding applications where scale formation is the cause of many valve failures with standard valves, the Stargate-O-Port-Valve^® AS™ anti-scale has evolved even further. The older versions of the AS valve feature inserted body and blade assemblies that eliminate material contact with the metal component of the valve body. FEP and PFA coatings were also used in older designs. SVC has moved beyond the commodity coatings solutions offered under a variety of fancy monikers. The modern Stargate-O-Port-Valve^® AS™ anti-scale uses not only the latest in coating and plating technology, and knowledge, but also unique seat designs/materials, along with a variety of internal configurations to combat the negative effects of scale formation. The Stargate-O-Port-Valve^® AS™ anti-scale does not rely on mechanical scrapers, secondary processes, or constant maintenance to provide reliable, safe, and long-term performance.