Providing Safety
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Sofis, previously known as Smith Flow Control, is an English producer of mechanical interlock systems for valves. These locks make sure that valves can only be opened or closed in a predetermined order.

Interlocking is a tested and trusted method for safe work based on exchanging coded keys.

Sofis is the first producer of the coded open-end wrench, which today is a much-used product in the industry.

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Sofis Products

Our range of Sofis products consists of valve interlocks systems