Exploring the innovative features and engineering principles of Severn’s OCT TOV Butterfly Valve that puts safety first in safety‑critical valve applications.

At Severn, safety is paramount in the design of our products. With our background in safety‑critical industries such as oil & gas, petrochemical and process plants, Severn understands the importance of safety‑first valve design for both our customers and employees.

As well as adhering to the strictest international valve safety standards, Severn have identified that shaft blowout prevention was paramount to our end users and the wider industrial valve and process industries, for improved valve performance and reduced operational downtime.

Butterfly Valve shafts are designed to connect to the disc with either dowel pins, taper pins, or keyways. The separation of the shaft and disc in service can be catastrophically dangerous in high‑pressure and safety‑critical valve applications. If any of these parts fail, the shaft may be ejected from the valve body. Shaft blowouts can occur when a coupling mechanism fails, therefore, disconnecting the shaft from the disc. With the pressures in the system, it may eject the unrestrained drive shaft through either end of the valve.

Not only is this projectile a huge safety concern but has the potential to compromise the pressure envelope of the valve allowing hazardous process media to escape into the atmosphere.

Severn has designed all their Triple Offset Butterfly Valves as standard with dual anti‑blowout protection, incorporated at both ends of the valve. This negates any chance of the shaft blowing out if the pins were to fail. The reduced shaft diameter at the drive end ensures the shaft cannot blow out through the packing follower, significantly improving operator and plant safety.

On the blank end of the valve, Severn have multiple engineered anti‑blowout features, which prevent shaft blowout. The anti‑blowout ring on the threaded shaft end ensures positive engagement without the need for additional fasteners. The blank end plate is locked in place and is designed to withstand full rated test pressures in severe service conditions.

Dual anti‑blowout devices are standard on the OCT TOV Butterfly Valve, meaning that even if the gland is removed, the secondary internal anti‑blowout device will stop ejection of the shaft under pressure, further enhancing industrial valve safety and reliability.

Severn have designed their Triple Offset Butterfly Valves to exceed the minimum wall thicknesses stated in ASME B16.34 valve design standards. Instead of using only the minimum allowance, Severn have engineered additional material to ensure improved pressure containing integrity and long‑term safety performance in the field.

Within Severn’s Triple Offset OCT TOV Butterfly Valve, there is a corrosion allowance. This means that the valve can afford to concede material to corrosion over time without affecting the pressure‑containing integrity or safety of the valve. The amount of corrosion may vary depending on the environment the valve is operating in, but due to Severn’s engineering heritage and design excellence, the OCT TOV Butterfly Valve has been designed to withstand changes in process conditions and operating environments.

High MAST (Maximum Allowable Shaft Torque) figures and safety factors are key when designing quarter‑turn butterfly valves for severe service. MAST represents the Maximum Allowable Shaft Torque a valve shaft can withstand during operation without mechanical failure. By utilising higher MAST figures, Severn helps maintain the structural integrity and mechanical safety of the valve throughout its service life.

Sizing actuators correctly is a credit to Severn’s engineering‑driven valve design approach. Actuators, gearboxes, or other valve drives must be sized correctly using accurate input and output torque values. By torque testing physical valves prior to final inspection, Severn compares real operating torques against theoretical calculations, ensuring accuracy, consistency and reliable valve automation performance across the range.

Safety has always been at the forefront of Severn’s designs, and this commitment is paramount in the 8500 OCT Triple Offset Butterfly Valve range, delivering confidence, compliance and reliability for safety‑critical applications worldwide.

With over 60 years’ experience in the design and manufacture of high‑performance butterfly valves, Severn launches a range built on decades of learnings and innovative engineering for the process, oil & gas, energy, and power generation industries.

In the dynamic landscape of industrial valve engineering, innovation often stems from a rich heritage of expertise and an unyielding commitment to excellence. Severn Glocon, a renowned name in the world of valve design and manufacturing, have once again proven this statement true with the unveiling of the superior Oblique Cone Technology (OCT) Triple Offset (TOV) Butterfly Valve.

This development represents Severn’s ongoing commitment to advanced valve technology, process reliability, and operational efficiency in the process and industrial energy markets, promising enhanced performance, long‑term reliability, and reduced lifecycle cost.

Engineering Heritage: The Foundation of Excellence 

Severn’s journey to engineering eminence is woven with a tapestry of innovation and dedication stemming back over 60 years. With an engineering history extending back to 1957 and the design and manufacturing of globe control valves, Severn has continuously pushed the boundaries of industrial valve design, earning a reputation for precision engineering, high‑integrity products, and global project delivery.

Drawing from this extensive engineering heritage, Severn has consistently delivered valve solutions for critical service applications that exceed industry standards and address the evolving needs of diverse sectors including oil & gas refineries, chemical processing plants, and power generation facilities.

Unveiling the Oblique Cone Technology (OCT) 

At the heart of Severn’s latest engineering triumph lies the OCT TOV Butterfly Valve, a revolutionary advancement in triple offset butterfly valve design and performance. Unlike traditional butterfly valves, which often suffer from limitations in sealing integrity, repeatability, and durability, the OCT TOV Butterfly Valve introduces circular sealing geometry.

Unlike traditional triple offset designs that use an ellipse, the benefit of circular geometry is that it provides a uniform sealing load around the circumference of the sealing diameter, delivering a reliable, repeatable bubble‑tight shut‑off.

By using circles rather than ellipses, Severn is able to apply proven circular sealing principles and incorporate these into the TOV, delivering a high‑performance isolation valve suitable for severe service conditions and critical process applications.

Repair Intelligence: Designed for Real‑World Performance

Incorporating Severn’s proprietary Repair Intelligence® knowledge — derived from extensive field feedback and forensic analysis of failed valves — each aspect of the OCT TOV Butterfly Valve has been optimised for accuracy, robustness, and long‑term service reliability.

Whether managing critical processes in oil & gas refineries, chemical plants, or power generation facilities, the OCT TOV Butterfly Valve ensures end users achieve their core remit of safe, compliant operations, minimum unplanned downtime, and reduced maintenance intervention.

Advantages for Process and Industrial Energy Markets 

The introduction of the innovative OCT TOV Butterfly Valve signifies a paradigm shift in industrial valve technology, offering measurable operational advantages:

Enhanced Performance:

Severn have designed each facet of this valve to provide the most accurate, reliable, and robust service capability possible, supporting plant uptime optimisation and process stability.

Extended Lifecycle:

Process conditions change over time. Severn have ensured seal interchangeability, allowing users to adapt sealing configurations as operating pressures, temperatures, or service severity evolve — extending valve service life and reducing total cost of ownership.

Increased Safety:

Safety is paramount to Severn’s valve design philosophy. In addition to meeting the strictest industry standards, shaft blowout prevention has been incorporated to enhance safety for end users and the wider industry.

Versatility:

Leveraging Severn’s engineering excellence, the OCT TOV Butterfly Valve delivers superior control in throttling and modulating applications, whilst also providing a repeatable isolation seal, making it ideal for multi‑service duties.

Environmental Sustainability:

Supporting reduced fugitive emissions and tightening environmental regulations, all Severn OCT triple offset butterfly valves are supplied with fugitive emissions packing sets as standard, helping end users meet compliance targets with confidence.

Setting New Benchmarks in Butterfly Valve Technology

Severn’s relentless pursuit of engineering excellence has culminated in the development of the OCT Triple Offset Butterfly Valve — a testament to the company’s commitment to innovation, customer satisfaction, and long‑term asset performance.

As industries worldwide seek high‑integrity valve solutions to meet increasingly complex operational demands, Severn Glocon stands ready to lead the way, setting new benchmarks for performance, reliability, and efficiency in industrial valve technology.