Special Valves for Special Applications: There's Two for Every Case

Benefits of the HVOF–Process

A major focus of the valve manufacturer JDV Valves was on the well known 'HVOF'–process. The principle behind this procedure is a combination of plasma and detonation processes for surface coating with cobalt-chromium compounds. Depending on the requirement, specific hardnesses can be achieved up to 70 HRC — thus making the surfaces ideally suited for demanding applications like textile chemicals handling.

Apart from the required abrasion resistance against powders and steam, issues such as cavity pressure relief without ball holes and automatic readjustment of the seat are of central importance for safe and durable application. Here a spring–loaded construction also provides significant benefits.

* * The author is an employee with Zuercher Technik, Sissach/Switzerland.

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