J. Keplerweg 142408 AC Alphen aan den RijnThe Netherlands


We are Sofis

Smart valve solutions for a cleaner and safer world.

Improve process and operator safety to protect people and the planet

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.

What we do

Valve interlocks are used to guarantee a predetermined sequence of valve operations. This is often customer specific. As all Sofis products are mounted on valves, they are bespoken to fit the valve. When working with us, you will meet a lot of our engineers. Together with you, they strive to offer the safest and practical solution. Besides mechanical valve interlocks, Sofis has developed several unique valve safety accessories that can be mounted on valves. They are designed to make the working environment in your plant safer and to improve working conditions for operations.

A long history with valve interlocks

Our employees have a long history in working with mechanical interlocking products. They have a vast understanding of leading valve interlock brands such as Ellis, Smith Flow Control and Netherlocks Safety Systems. Some of our employees and partner companies have worked with valve interlocks for more than 30 years.

Part of the Halma group of companies

Sofis is part of Halma PLC, a market leader in specialist safety, health and environmental technologies, registered at the London Stock Exchange. Halma’s business is about protecting and improving the quality of life for people worldwide. Halma companies have a core focus on health, safety, and the environment, providing innovative solutions for many of the key problems facing the world today.