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Working closely with valve manufacturers, James Walker Devol has developed Devlon V-API as a superior seat material that would overcome the individual shortcomings of all the other material grades.

Ball valve seats of Devlon V-API are now widely specified for applications where operating conditions are stringent, particularly within the oil and gas industry.

Devlon V-API is claimed to have many advantages over nylon and PTFE, with one material replacing several thermoplastics over a wide range of operating pressures and temperatures.

The product’s operating temperature range is -193C to +200C (-315F to +392F) and it can handle pressures of 414 bar (6,000psi) at +176C (350F).

In comparison with virgin or glass-filled PTFE, Devlon V-API has similar friction values at low and high temperatures, with the benefit of superior dimensional stability.

It is also said to have a cost advantage over PTFE and PEEK and can be manufactured with up to 2.25m (88.6in) diameter.

For many years the industry trend was to use several thermoplastics to cover the required operating range for ball valve seats and inserts.

However, by specifying filled PTFE or nylon as the soft seat material, manufacturers were restricting the design of their valves and creating ambiguity as to the precise operational capabilities.

Devlon V-API is currently approved by operators such as Shell and BP and is specified by more than 20 leading valve companies.

James Walker and Co

James Walker is a dynamic global manufacturing organisation that supplies a vast range of high performance fluid sealing products and associated knowledge-based services to virtually every sector of industry. Our activities range from research and development, product application, manufacture and supply, to plant monitoring, on-site maintenance and seal refurbishment. An intimate knowledge of the industrial plant and processes used by our customers worldwide enables us to solve their fluid sealing problems with best value systems designed to minimise total cost of ownership.

State-of-the-art skills in materials technology, particularly relating to elastomers, polymers, composites and engineering plastics, are central to our success — in addition to the core disciplines of high performance sealing technology and tribology. Extensive expertise in the precision machining of exotic alloys for metallic seals, and tension control fasteners for bolted joints, positions us firmly at the forefront of these technologies. We therefore claim that our products and expertise help to keep industry worldwide running safely and efficiently year-in and year-out.

Our worldwide family of companies has 11 production, engineering, distribution and customer support sites in the UK, and a further 40 spread across Continental Europe, Australia, New Zealand, SE Asia, South Africa and the USA. At the local level, a close-knit network of James Walker companies and official distributors supplies our products and services to over 100 countries. Highly developed e-commerce systems and logistics operations give customers the surety of supply they need. We also work in partnership with customers at all levels. The long-term contracts we forge with multinational corporations cover the requirements of their plants across many continents.

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