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Key management

Key management systems detect and record insertion and removal of interlock keys in one central place. Increase productivity and provide safer operations.

Gain valuable insight in interlock usage

Valve interlocks improve process safety, but challenges may arise through poor use of interlocks and limited operational knowledge. Time taken searching for missing keys or taking the wrong one in to the field, can cause considerable delays. Additionally, in using mechanical interlocks alone, you cannot make use of all the data driven insights, with plants becoming more technologically driven.

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Key management system for valve interlocks

Improve operator efficiency and plant performance

Our key management systems give greater information and insight form your interlock keys. They also allow you to make smarter decisions by using information across the plant.

Get your key management configuration

3 systems for every requirement

You can choose from three key management systems designed with you and your operators in mind. Boasting a modular and scalable design, you can add to each system as and when your needs change.

Key detect system for valve interlocks

KM Detect

Electronically authorise and control key usage. Get a snap shot overview of the status of your valve systems.

Information collect system for valve interlock keys

KM Collect

Records a full log of interlock key movement, providing a granular record of interlock key activities.

Interactive key management system for valve interlocks

KM Interact

Provides full operational guidance via a touchscreen interface.

Smith Flow Control and Netherlocks Safety Systems are now Sofis

Reference companies

Sofis key management solutions are the most intelligent interlock key management systems available to the market. They form the basis of the new industry standard for interlock key management.

Vopak logo small
Shell logo small
Saudi Aramco logo small
Solvay logo
VTTI energy partners logo
Sasol logo
Airproducts logo
Slovnaft logo
BASF logo small

Key management in practice: dry bulk storage

One of the major challenges in dry bulk handling is to prevent incorrect loading and unloading, which can result in significant loss. Sofis valve interlocks eliminate incorrect loading and unloading by only allowing the right valves to be opened or closed in the correct order, leading operators safely through strict work procedures.


Sofis offers you support through local service centres and a network of certified local service partners. This enables efficient installation and maintenance of your Sofis products. We strive to create partnerships with our clients, providing a turnkey approach to service. This will lead to a reduction in your total cost of ownership.

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