Smith Flow Control Limited

In 2016 Smith Flow Control and Netherlocks Safety Systems have merged. Two global leaders in the field of valve operations have joined forces and moved on as Sofis. With our combined expertise, our united service team and a doubled office and partner network we are bigger and stronger and thus better able to give worldwide support and cater every market need. Sofis is a manufacturer of valve operation systems such as mechanical valve interlocks, portable actuators and valve position indicators. We are the world’s largest interlock manufacturer, providing bespoke design solutions that protect people and property throughout the world. We create smart valve solutions that improve process and operator safety to protect people and the planet. Follow us at