Severn’s Triple Offset Butterfly Valve Solves the Issue of Galvanic Corrosion

Discover how engineering excellence and heritage has driven Severn’s OCT TOV Butterfly Valve to deliver unmatched reliability in Seawater environments.

Severn’s research & development team has designed a Butterfly Valve that solves the problem of galvanic corrosion and meets strict fire test standards.

What is galvanic corrosion and its costly effects?

The impact of galvanic corrosion on critical assets is a costly problem which harms efficiency, putting additional pressure on plant operating costs. Severn have utilised their engineering heritage, research and development & repair intelligence knowledge to develop a valve that deals with the issue of galvanic corrosion head on.

Seawater service valves play an integral role in the process and their ability to either supply or isolate sections of the water line is a vital safety feature. Therefore, eliminating galvanic corrosion while maintaining firesafe credentials has been an enduring challenge for the industry.

In recent years, the use of graphite sealing technology has surged. It is soft, flexible, and easy to cut, but it has high heat resistance and is almost inert. However, it is also the only non-metal that can conduct electricity. Furthermore, its nobility exceeds that of noble metals including stainless steel, bronze, and titanium. From a galvanic corrosion perspective, graphite has become not only the solution to problems but can often be the cause of the issues.

By working closely with end users and operators, Severn has designed a long-term solution. The Severn team of engineering experts designed a valve that either replaces the graphite components completely or stops them from contacting the line media. This significantly reduces the risk of galvanic corrosion in day-to-day operations and ensures the highest level of safety. Ensuring you achieve safe operations and minimal downtime.

Severn has developed a hybrid polymer metallic seal that moves away from the use of graphite laminates. By utilising a primary metallic seal with a secondary polymer seal, not only have Seven removed the graphite from the seal but have additionally increased the valves isolation sealing capabilities and maintained the firesafe performance crucial for such critical applications.

In addition to addressing the corrosion problem, Severn’s Butterfly Valves also meet important fire test standards such as API 6FA, API 607, and ISO 10497 accreditations.

The OCT-SW can be manufactured from corrosion-resistant materials such as Aluminium Bronze, Super Duplex, and Titanium, with the added knowledge that anti-blowout protection & hard-faced trims come as standard.

8500 Triple Offset Oblique Cone Technology (OCT) - Severn

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