Severn’s engineering heritage and excellence in valve manufacturing has led to the innovative design of a product that can master both Control & Isolation applications within critical flow control systems.

Utilising Severn’s long history with Control Valve design, our team of valve engineering experts have been able to manufacture a Triple Offset Butterfly Valve that can be used to provide superior flow control performance in both throttling and modulating service, whilst additionally providing a repeatable, bubble‑tight seal for isolation valve duties.

By designing a Control Valve that can isolate, rather than an isolation valve that attempts to control (which may initially sound similar but is fundamentally different in performance outcome), Severn has developed a high‑performance butterfly valve that maximises Cv through streamlined internal geometry. This delivers optimal flow characteristics, improved process controllability, and stable valve performance under variable operating conditions.

This distinction is critical for industries requiring precise process control, reliable shut‑off, and long‑term operational safety, particularly within oil & gas, energy, offshore, chemical processing, and industrial fluid handling systems.

Designing for Reliability, Safety, and Performance

Severn has eliminated the need for disc fasteners or bolted‑on seals, allowing further optimisation of the disc profile. By removing fasteners from the disc:

• Flow efficiency is improved
• Pressure drop is reduced
  Risk of loose components entering the pipeline due to vibration is eliminated

This approach significantly enhances operational reliability, particularly in high‑vibration and severe service environments.

By adopting a body‑mounted sealing arrangement, Severn has increased both the longevity and reliability of the valve. Removing the seal from the direct flow path of the process media reduces wear, enabling Severn to:

• Increase effective bore size
• Maximise Cv
• Extend service life in demanding applications

Patented Oblique Cone Technology (OCT)

Using Severn’s Patented Oblique Cone Technology (OCT), the valve utilises circular sealing geometry that ensures an even seal load distribution around the circumference of the disc.

This technology provides:

• Repeatable bubble‑tight shut‑off
• Improved operational safety
• Enhanced process reliability
• Reduced downtime and maintenance intervention

Ensuring customers consistently meet their core remit of safe operations and minimum downtime.

Advanced Trims for Severe Service Conditions

The OCT geometry enables Severn to offer an extensive range of control valve trims not traditionally associated with Triple Offset Butterfly Valves.

• By utilising a one‑piece disc design, Severn can incorporate:
• Anti‑cavitation trims
• Noise‑reduction solutions
• Flow conditioning elements
• Baffle plates for severe service control

This allows the valve to operate effectively in high‑pressure drop, high‑velocity, and erosive flow conditions, where a conventional butterfly valve would typically suffer reduced service life or performance limitations.

Reduced Inventory, Lower Costs, Greater Efficiency

• The OCT Triple Offset Butterfly Valve can be utilised for both control and isolation valve applications, enabling end users to:
• Reduce valve stock inventory
• Standardise spare parts
• Lower overall operating costs
• Simplify maintenance strategies

Standardised and interchangeable components further reduce spares holding requirements, delivering measurable lifecycle cost savings.

It also provides end users with the option to utilise a single valve to perform both control and isolation functions within a system, rather than two separate valves. This results in:

• Reduced CAPEX and OPEX
• Lower system weight
• Simplified piping design

These benefits are particularly critical for weight‑sensitive applications such as offshore installations, FPSOs, and platform‑based processing facilities.

Discover how Severn’s high‑performance control and isolation valve solutions can enhance your operation.

Severn’s patented OCT TOV butterfly valve technology advances traditional triple offset valve (TOV) sealing technology even further, maximising sealing performance for critical flow control applications and high‑integrity isolation valves.

The Oblique Cone Technology (OCT) moves away from the traditional elliptical sealing shape and introduces a circular sealing geometry, enabling proven double offset butterfly valve sealing principles to be applied within the Severn OCT TOV Butterfly Valve design. This makes it ideally suited for high‑performance butterfly valves, severe service valve applications, and demanding process control environments.

In addition, trims traditionally associated with double offset butterfly valves — such as anti‑cavitation trims for control valves — can be incorporated into the TOV butterfly valve design. This versatility positions Severn’s OCT TOV Butterfly Valve as an ideal solution for combined isolation and control valve applications, where process stability, accurate flow regulation, and reliable shut‑off performance are essential.

Hybrid Sealing Technology – Advancing Butterfly Valve Performance

Severn’s significant investment in control valve research and development has been instrumental in introducing hybrid sealing technology into the OCT TOV butterfly valve.

By combining a hybrid polymer‑metallic valve seal, Severn applies the self‑compensating sealing benefits of triple offset valve technology to a polymer sealing system. The addition of a metallic sealing element ensures that if the soft seal becomes damaged during operation, the metal seal automatically engages, continuing to provide a reliable zero‑leakage butterfly valve seal.

This fault‑tolerant butterfly valve sealing system makes the OCT TOV butterfly valve particularly suitable for:

• Challenging and variable process conditions

• Severe service valve applications

• High‑cycle control valve duties

Proven Testing and Validation

The hybrid butterfly valve sealing system has undergone an extensive and rigorous testing programme, including:

• High‑cycle endurance testing
• Fire‑safe valve testing
• Extreme operating condition validation

These tests confirm that even in harsh operating environments, the OCT TOV Butterfly Valve delivers a high‑integrity sealing solution.

This level of performance would not be achievable with a conventional double offset butterfly valve, where seal damage typically necessitates seal replacement, resulting in unplanned plant downtime, increased maintenance intervention, and potential production losses.

Self‑Compensating Design and Reduced Wear

Severn’s OCT TOV Butterfly Valve is fully self‑compensating for wear, ensuring consistent sealing performance throughout the valve lifecycle.

The third‑offset camming action significantly reduces seal wear by minimising seal contact. Disc‑to‑seal contact occurs only during the final 1–2 degrees of valve closure, substantially lowering operating torque, friction, and mechanical wear.

In comparison, a standard double offset butterfly valve typically maintains seal contact over approximately 10 degrees of rotation, leading to increased wear and reduced long‑term reliability.

Built‑In Safety and Compliance

The standard OCT TOV Butterfly Valve design incorporates the requirements of the most stringent international valve standards.

Key safety features include a dual anti‑blow‑out shaft design, supplied as standard, ensuring the valve shaft cannot be ejected during operation — enhancing plant safety, asset protection, and operational integrity.

The hybrid polymer valve seal is fully compliant with EN ISO 90079‑36 (ATEX) requirements, making the valve suitable for hazardous area installations and ATEX‑rated process applications.

In‑Field Serviceability and Future‑Proof Design

Severn recognises that operating conditions can evolve beyond original design assumptions. To address this, the OCT TOV butterfly valve sealing system has been engineered with interchangeable seal options.

Where required, the hybrid seal can be replaced in‑field with a laminated seal or a solid metal seal — without replacing the main valve body or major components.

This ensures the OCT TOV Butterfly Valve remains:

• Fully serviceable in the field
• Upgradeable to suit harsher process conditions
• Optimised for safe operation, improved plant reliability, and reduced maintenance downtime

Find out more about Severn’s OCT TOV Butterfly Valve, advanced butterfly valve sealing solutions, and high‑performance isolation and control valves by visiting our website via the link below.

Severn Glocon Valves, a leading global manufacturer of industrial valves, is thrilled to announce its participation in ADIPEC 2023, taking place from October 2nd to October 5th at the Abu Dhabi National Exhibition Centre. The event serves as a platform for industry leaders to connect, share knowledge, and introduce advanced flow control solutions. Severn will leverage this opportunity to unveil its latest innovation, the 8500 OCT Butterfly Valve, engineered for demanding oil and gas applications.

Severn will leverage this opportunity to unveil its latest innovation, the 8500 OCT Butterfly Valve, a high‑performance butterfly valve designed for critical isolation and control applications.

The Severn 8500 OCT Butterfly Valve represents a new era in industrial valve engineering, designed to meet the evolving requirements of oil and gas, petrochemical, and energy infrastructure projects. With its precision manufacturing and exceptional service performance, the 8500 OCT Butterfly Valve sets a new standard for reliability, durability, and lifecycle efficiency.

By combining advanced sealing technology, innovative OCT geometry, and robust materials, the valve ensures optimal flow control and long‑term performance under high‑pressure and severe service conditions.

“We are excited to introduce the 8500 OCT Butterfly Valve at ADIPEC 2023,” said Matthew Balderson, Vice President, Middle East & Africa, Severn Glocon Valves. “This valve embodies our commitment to engineering excellence, innovation in valve design, and delivering high‑integrity valve solutions that empower our clients to achieve their operational and production goals.”

Severn’s presence at ADIPEC underscores the company’s commitment to driving innovation in the global energy industry. Visitors to the Severn Valve booth 8349 on the UK Pavilion will have the opportunity to experience first‑hand the features and performance benefits of the 8500 OCT Butterfly Valve, as well as engage with Severn’s valve application experts to discuss specific operational and process challenges.

As a key player in the valve manufacturing industry, Severn’s participation in ADIPEC 2023 demonstrates its continued dedication to delivering cutting‑edge butterfly valve solutions, advanced isolation and control valves, and high‑performance flow control equipment that drive efficiency, safety, and reliability across the oil and gas and wider energy sectors.

For more information about Severn’s OCT butterfly valve technology, or to discuss your valve application requirements, please visit sales@severnvalve.com.

About Severn:

Part of the Severn Group, Severn Valve manufactures and supports high‑quality industrial valves for the energy industries. Its control valves, choke valves, and butterfly valves are pre‑eminent in the global market, underpinning the reliability, safety, and high performance of business‑critical client infrastructure.

Severn’s global reach, technical expertise, and collaborative engineering approach — all founded upon a heritage of British engineering excellence — help assure production continuity for clients and reduce the risk of costly unplanned downtime.

With a deep understanding of asset lifecycle management, Severn Valve offers end‑to‑end valve engineering solutions, enabling clients to meet their core imperatives of safe operations, operational efficiency, and minimum downtime.